Energy Absorbing Heels: What "E" Actually Means
The E on a safety shoe stands for energy absorption of the seat region, which is the standard's term for the heel. It means one specific thing: in a laboratory, that heel absorbed at least 20 joules when it was compressed. That is the whole claim. It is not a comfort rating, it is not a measure of how the shoe feels at hour nine, and it is not a score you can compare between two models, because a heel that absorbed 21 joules and one that absorbed 45 carry exactly the same letter. Understanding what the test actually does is the fastest way to stop over-reading the marking and start looking at the things that genuinely decide how a shoe feels underfoot. What the E Marking Actually Certifies Like antistatic performance, energy absorption is written into the base requirements of the main safety classes rather than sold as an extra. If your shoe is S1 or above, it has been through this test. Class Energy absorbing heel What else the class brings SB No, unless separately marked E The 200J toe cap and basic requirements only S1 Yes Closed heel region and antistatic performance S1P Yes S1 plus a perforation-resistant midsole S2 Yes S1 plus water resistance of the upper S3 Yes S2 plus perforation resistance and a cleated outsole S6 and S7 Yes The newer waterproof constructions SB is the exception again, which is why it keeps catching people out. A basic SB shoe covers the toe and little else, as we set out in what SB means and what it does not cover. Everything from S1 upward includes the energy absorbing heel by definition, so a product page that advertises it as a special feature is telling you something the class code already guaranteed. Inside the Test, Step by Step The method is more brutal and more specific than the phrase "shock absorbing" suggests. 20 JMinimum energy absorbed to pass 5,000 NForce the heel is compressed to 10 mm/minSpeed the load is applied 1 JPrecision the result is reported to A shaped punch goes inside the shoe. Testing uses a set of backpart punches made from standardised lasts, and the one matching the shoe's size is selected so the load is spread the way a real heel would spread it. It is brought down onto the centre of the heel. The punch contacts the inside of the shoe at the middle of the heel area, so the whole sole structure beneath it takes the load. The load is applied slowly. Compression runs at a rate of 10 mm per minute, which is a deliberate, controlled squeeze rather than an impact. It continues until 5,000 newtons. That is the end point, and the sole is compressed all the way there. The energy is the area under the curve. Absorbed energy is calculated by integrating the load deflection curve between 50 N and 5,000 N, reported to the nearest joule, and it must not be less than 20 J. Why it is measured as energy, not softness Energy is force multiplied by the distance the sole compresses. A thick soft sole that squashes a long way can absorb the same energy as a firmer sole that compresses less but resists harder. That is why two shoes that feel completely different underfoot can produce similar numbers, and why the figure alone cannot tell you which one you will prefer. Why 5,000 Newtons Is Not a Footstep This is the part worth sitting with, because it reframes the whole marking. Gait research puts the peak vertical ground reaction force in normal walking at around 107 per cent of body weight during the loading phase just after heel contact, with the force through a stride typically moving between roughly 80 and 120 per cent of body weight. For an 85 kg worker, body weight is about 834 newtons, so the peak is somewhere near 890 newtons. The test compresses the heel to 5,000 newtons. That is roughly five to six times the peak force of a normal walking step, applied once, slowly, to a brand new shoe. The test and the workday are different events Both matter, but only one of them is certified. The laboratory test LoadUp to 5,000 N Speed10 mm per minute RepetitionsOnce Condition of shoeNew A severe single squeeze Your actual shift LoadAround 107% of body weight SpeedFast impact, milliseconds RepetitionsThousands per day Condition of shoeProgressively worn Mild loads, endless repetition So the test proves the heel structure has real capacity. It answers the question "can this sole soak up a heavy load without bottoming out", and that is genuinely worth knowing. What it does not do, and was never designed to do, is model a ten hour shift. Fatigue is a story about thousands of small repeated loads, and this is a single large one. What the E Marking Does Not Tell You Four limits are worth being clear about, because most of the disappointment around cushioning comes from expecting the letter to cover them. It is a threshold, not a score. 20 J is a floor. A shoe scraping past it and a shoe comfortably beyond it both print the same E. The marking cannot rank two products. It is measured on a new shoe. Certification captures a moment. Nothing in that letter describes what the heel is doing after six months of daily compression. It says nothing about the forefoot. The test is the seat region only. If you stand still for long periods, a good deal of your loading is through the ball of the foot, which is not part of this assessment at all. It is not a comfort claim. Comfort depends on fit, volume, insole, upper, weight and how your particular foot loads. Energy absorption is one input among many, and the standard makes no promise about how anything will feel. The honest way to read it Treat E as a floor that has been cleared, not as a feature that has been won. It tells you the heel is not hollow and not brittle. It cannot tell you whether this shoe suits your feet, and no marking can. Where the Cushioning Actually Comes From The letter is certified, but the feel comes from the midsole material sitting between your heel and the ground. That is the part worth reading on a spec sheet. Material How it behaves underfoot The trade-off Polyurethane (PU) Resilient and supportive, holds its structure well over a long day Denser than EVA, and susceptible to breakdown with age and moisture EVA Very light and soft on first wear, which is why it feels immediately comfortable Compresses permanently over time, so the cushioning fades PU and EVA combined EVA for lightness with a PU or rubber layer for durability and grip More complex construction, and the two layers age at different rates TPU inserts Used in the heel for structure and energy return rather than softness Adds firmness, which not everyone wants under the heel If you are weighing up the two you will meet most often, PU and EVA outsoles compared goes through the differences properly, and what workers should know about EVA covers the softness-versus-longevity question on its own. How Heel Cushioning Fades The certificate does not expire. The cushioning does. This is the single most useful thing to understand about the E marking, and nothing on the box mentions it. Compression set. Foams do not fully rebound after being squashed thousands of times. The cells collapse gradually and the midsole thins, which is why an old sole can look intact and feel dead. Material breakdown. Polyurethane degrades over time in the presence of moisture, a slow chemical process that continues whether the shoe is worn or sitting in a cupboard. Uneven loading. Most people wear one edge of the heel faster, so cushioning becomes asymmetric long before the sole looks worn out. None of this is a defect. It is what foam does. The practical consequence is that heel comfort should be judged by how the shoe feels now rather than by a letter printed when it was new, and a pair that has gone flat is worth replacing even if the toe cap and upper are fine. The wider cost of getting this wrong is something we looked at in the hidden cost of heavy safety shoes, and the physical side in what happens to your feet after ten hours. The Insole Is Part of What Gets Tested One detail follows directly from the method. The punch presses against the inside of the shoe, which means everything sitting in the heel at that moment forms part of what is being compressed, including the removable insole the shoe was supplied with. That has a practical consequence people rarely think about. Throw away the original insole and drop in a thin flat replacement, and the heel you are standing on is no longer quite the one that was certified. It may well still be fine, and for many people a better-fitting insole is a clear improvement, but it is worth knowing that the tested configuration is the shoe as it came out of the box rather than the shoe as you have modified it. Five Questions Worth Asking Is the shoe S1 or above? If so, the energy absorbing heel is already included and does not need to be sold to you as a bonus. Do you walk or do you stand? Walkers load the heel repeatedly. Standers load the forefoot, which this test never touches, so heel cushioning is less of the story for them. What is the midsole made of? The material tells you more about how the shoe will age than the certification does. How old is your current pair? If the heel feels flat, it probably is, regardless of what the shoe passed when new. Does it actually fit? A heel that slips wastes cushioning, because the foot is moving relative to the sole rather than loading it cleanly. The Honest Verdict The E marking is a real, measurable property with a precise test behind it, and it deserves neither the shrug it usually gets nor the weight marketing puts on it. It certifies that a new heel absorbed at least 20 joules under a slow compression to 5,000 newtons. That proves capacity. It does not promise comfort, it cannot rank two shoes against each other, and it says nothing about month six. The useful takeaway is narrow but genuinely practical. Stop shopping for the letter, because every S1 shoe has it. Shop instead for the midsole material, the fit, and how old your current pair is, because those are the three things that actually change how the end of a shift feels. On ours: the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, so the shock-absorbing heel is part of that certification, exactly as it is on every other S1P shoe on the market. We are not going to claim that makes your feet feel different at hour ten, because the standard does not measure that and we would be guessing. What we would rather do is hear from you after a real week in them. Full detail on the code is in what S1P certification actually covers. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the cushioning, fit and comfort hold up over a full week, and what we should improve. If your site needs a higher rating or specialist protection, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does E mean on safety shoes? E means energy absorption of the seat region, which is the heel. To carry it, the heel must absorb at least 20 joules when compressed in a laboratory test. It is a minimum threshold rather than a comfort score. Do all S1P safety shoes have an energy absorbing heel? Yes. Energy absorption is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classes. SB is the exception, since a basic SB shoe only covers the toe cap and basic requirements unless separately marked E. How is the energy absorbing heel tested? A shaped backpart punch sized to the footwear is pressed into the inside of the heel and the sole is compressed at 10 mm per minute until the force reaches 5,000 newtons. Absorbed energy is calculated by integrating the load deflection curve between 50 N and 5,000 N and must be at least 20 joules. Is 20 joules a lot? It is a floor, not a target. Some soles clear it narrowly and others exceed it comfortably, and both print the same E marking. Because the standard reports only pass or fail, the letter cannot be used to compare two shoes against each other. Does an energy absorbing heel reduce fatigue? The standard makes no claim about fatigue, and neither should a seller. The test is a single slow compression on a new shoe, whereas fatigue comes from thousands of repeated loads over a shift. Cushioning is one factor among fit, weight, insole and the surface you work on. Does the cushioning wear out? Yes. Midsole foams take a permanent compression set over time, polyurethane degrades slowly in the presence of moisture, and most people wear one edge of the heel faster than the other. The certification describes a new shoe and does not expire, but the cushioning genuinely fades. Does the E marking cover the forefoot? No. The test applies to the seat region, meaning the heel, only. If your work involves long periods standing still, much of your loading goes through the ball of the foot, which this marking does not assess.
Energy Absorbing Heels: What "E" Actually Means
The E on a safety shoe stands for energy absorption of the seat region, which is the standard's term for the heel. It means one specific thing: in a laboratory, that heel absorbed at least 20 joules when it was compressed. That is the whole claim. It is not a comfort rating, it is not a measure of how the shoe feels at hour nine, and it is not a score you can compare between two models, because a heel that absorbed 21 joules and one that absorbed 45 carry exactly the same letter. Understanding what the test actually does is the fastest way to stop over-reading the marking and start looking at the things that genuinely decide how a shoe feels underfoot. What the E Marking Actually Certifies Like antistatic performance, energy absorption is written into the base requirements of the main safety classes rather than sold as an extra. If your shoe is S1 or above, it has been through this test. Class Energy absorbing heel What else the class brings SB No, unless separately marked E The 200J toe cap and basic requirements only S1 Yes Closed heel region and antistatic performance S1P Yes S1 plus a perforation-resistant midsole S2 Yes S1 plus water resistance of the upper S3 Yes S2 plus perforation resistance and a cleated outsole S6 and S7 Yes The newer waterproof constructions SB is the exception again, which is why it keeps catching people out. A basic SB shoe covers the toe and little else, as we set out in what SB means and what it does not cover. Everything from S1 upward includes the energy absorbing heel by definition, so a product page that advertises it as a special feature is telling you something the class code already guaranteed. Inside the Test, Step by Step The method is more brutal and more specific than the phrase "shock absorbing" suggests. 20 JMinimum energy absorbed to pass 5,000 NForce the heel is compressed to 10 mm/minSpeed the load is applied 1 JPrecision the result is reported to A shaped punch goes inside the shoe. Testing uses a set of backpart punches made from standardised lasts, and the one matching the shoe's size is selected so the load is spread the way a real heel would spread it. It is brought down onto the centre of the heel. The punch contacts the inside of the shoe at the middle of the heel area, so the whole sole structure beneath it takes the load. The load is applied slowly. Compression runs at a rate of 10 mm per minute, which is a deliberate, controlled squeeze rather than an impact. It continues until 5,000 newtons. That is the end point, and the sole is compressed all the way there. The energy is the area under the curve. Absorbed energy is calculated by integrating the load deflection curve between 50 N and 5,000 N, reported to the nearest joule, and it must not be less than 20 J. Why it is measured as energy, not softness Energy is force multiplied by the distance the sole compresses. A thick soft sole that squashes a long way can absorb the same energy as a firmer sole that compresses less but resists harder. That is why two shoes that feel completely different underfoot can produce similar numbers, and why the figure alone cannot tell you which one you will prefer. Why 5,000 Newtons Is Not a Footstep This is the part worth sitting with, because it reframes the whole marking. Gait research puts the peak vertical ground reaction force in normal walking at around 107 per cent of body weight during the loading phase just after heel contact, with the force through a stride typically moving between roughly 80 and 120 per cent of body weight. For an 85 kg worker, body weight is about 834 newtons, so the peak is somewhere near 890 newtons. The test compresses the heel to 5,000 newtons. That is roughly five to six times the peak force of a normal walking step, applied once, slowly, to a brand new shoe. The test and the workday are different events Both matter, but only one of them is certified. The laboratory test LoadUp to 5,000 N Speed10 mm per minute RepetitionsOnce Condition of shoeNew A severe single squeeze Your actual shift LoadAround 107% of body weight SpeedFast impact, milliseconds RepetitionsThousands per day Condition of shoeProgressively worn Mild loads, endless repetition So the test proves the heel structure has real capacity. It answers the question "can this sole soak up a heavy load without bottoming out", and that is genuinely worth knowing. What it does not do, and was never designed to do, is model a ten hour shift. Fatigue is a story about thousands of small repeated loads, and this is a single large one. What the E Marking Does Not Tell You Four limits are worth being clear about, because most of the disappointment around cushioning comes from expecting the letter to cover them. It is a threshold, not a score. 20 J is a floor. A shoe scraping past it and a shoe comfortably beyond it both print the same E. The marking cannot rank two products. It is measured on a new shoe. Certification captures a moment. Nothing in that letter describes what the heel is doing after six months of daily compression. It says nothing about the forefoot. The test is the seat region only. If you stand still for long periods, a good deal of your loading is through the ball of the foot, which is not part of this assessment at all. It is not a comfort claim. Comfort depends on fit, volume, insole, upper, weight and how your particular foot loads. Energy absorption is one input among many, and the standard makes no promise about how anything will feel. The honest way to read it Treat E as a floor that has been cleared, not as a feature that has been won. It tells you the heel is not hollow and not brittle. It cannot tell you whether this shoe suits your feet, and no marking can. Where the Cushioning Actually Comes From The letter is certified, but the feel comes from the midsole material sitting between your heel and the ground. That is the part worth reading on a spec sheet. Material How it behaves underfoot The trade-off Polyurethane (PU) Resilient and supportive, holds its structure well over a long day Denser than EVA, and susceptible to breakdown with age and moisture EVA Very light and soft on first wear, which is why it feels immediately comfortable Compresses permanently over time, so the cushioning fades PU and EVA combined EVA for lightness with a PU or rubber layer for durability and grip More complex construction, and the two layers age at different rates TPU inserts Used in the heel for structure and energy return rather than softness Adds firmness, which not everyone wants under the heel If you are weighing up the two you will meet most often, PU and EVA outsoles compared goes through the differences properly, and what workers should know about EVA covers the softness-versus-longevity question on its own. How Heel Cushioning Fades The certificate does not expire. The cushioning does. This is the single most useful thing to understand about the E marking, and nothing on the box mentions it. Compression set. Foams do not fully rebound after being squashed thousands of times. The cells collapse gradually and the midsole thins, which is why an old sole can look intact and feel dead. Material breakdown. Polyurethane degrades over time in the presence of moisture, a slow chemical process that continues whether the shoe is worn or sitting in a cupboard. Uneven loading. Most people wear one edge of the heel faster, so cushioning becomes asymmetric long before the sole looks worn out. None of this is a defect. It is what foam does. The practical consequence is that heel comfort should be judged by how the shoe feels now rather than by a letter printed when it was new, and a pair that has gone flat is worth replacing even if the toe cap and upper are fine. The wider cost of getting this wrong is something we looked at in the hidden cost of heavy safety shoes, and the physical side in what happens to your feet after ten hours. The Insole Is Part of What Gets Tested One detail follows directly from the method. The punch presses against the inside of the shoe, which means everything sitting in the heel at that moment forms part of what is being compressed, including the removable insole the shoe was supplied with. That has a practical consequence people rarely think about. Throw away the original insole and drop in a thin flat replacement, and the heel you are standing on is no longer quite the one that was certified. It may well still be fine, and for many people a better-fitting insole is a clear improvement, but it is worth knowing that the tested configuration is the shoe as it came out of the box rather than the shoe as you have modified it. Five Questions Worth Asking Is the shoe S1 or above? If so, the energy absorbing heel is already included and does not need to be sold to you as a bonus. Do you walk or do you stand? Walkers load the heel repeatedly. Standers load the forefoot, which this test never touches, so heel cushioning is less of the story for them. What is the midsole made of? The material tells you more about how the shoe will age than the certification does. How old is your current pair? If the heel feels flat, it probably is, regardless of what the shoe passed when new. Does it actually fit? A heel that slips wastes cushioning, because the foot is moving relative to the sole rather than loading it cleanly. The Honest Verdict The E marking is a real, measurable property with a precise test behind it, and it deserves neither the shrug it usually gets nor the weight marketing puts on it. It certifies that a new heel absorbed at least 20 joules under a slow compression to 5,000 newtons. That proves capacity. It does not promise comfort, it cannot rank two shoes against each other, and it says nothing about month six. The useful takeaway is narrow but genuinely practical. Stop shopping for the letter, because every S1 shoe has it. Shop instead for the midsole material, the fit, and how old your current pair is, because those are the three things that actually change how the end of a shift feels. On ours: the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, so the shock-absorbing heel is part of that certification, exactly as it is on every other S1P shoe on the market. We are not going to claim that makes your feet feel different at hour ten, because the standard does not measure that and we would be guessing. What we would rather do is hear from you after a real week in them. Full detail on the code is in what S1P certification actually covers. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the cushioning, fit and comfort hold up over a full week, and what we should improve. If your site needs a higher rating or specialist protection, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does E mean on safety shoes? E means energy absorption of the seat region, which is the heel. To carry it, the heel must absorb at least 20 joules when compressed in a laboratory test. It is a minimum threshold rather than a comfort score. Do all S1P safety shoes have an energy absorbing heel? Yes. Energy absorption is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classes. SB is the exception, since a basic SB shoe only covers the toe cap and basic requirements unless separately marked E. How is the energy absorbing heel tested? A shaped backpart punch sized to the footwear is pressed into the inside of the heel and the sole is compressed at 10 mm per minute until the force reaches 5,000 newtons. Absorbed energy is calculated by integrating the load deflection curve between 50 N and 5,000 N and must be at least 20 joules. Is 20 joules a lot? It is a floor, not a target. Some soles clear it narrowly and others exceed it comfortably, and both print the same E marking. Because the standard reports only pass or fail, the letter cannot be used to compare two shoes against each other. Does an energy absorbing heel reduce fatigue? The standard makes no claim about fatigue, and neither should a seller. The test is a single slow compression on a new shoe, whereas fatigue comes from thousands of repeated loads over a shift. Cushioning is one factor among fit, weight, insole and the surface you work on. Does the cushioning wear out? Yes. Midsole foams take a permanent compression set over time, polyurethane degrades slowly in the presence of moisture, and most people wear one edge of the heel faster than the other. The certification describes a new shoe and does not expire, but the cushioning genuinely fades. Does the E marking cover the forefoot? No. The test applies to the seat region, meaning the heel, only. If your work involves long periods standing still, much of your loading goes through the ball of the foot, which this marking does not assess.
Safety Shoe Tread Patterns: Deeper Is Not Grippier
The tread on a safety shoe is not styling. It is a drainage system with a very short deadline. At heel strike your foot arrives on the floor in a few hundredths of a second, and in that window the sole has to push a film of water, detergent or oil out of the way and reach the surface underneath. The pattern is what decides whether it manages that. Which is why the instinct to buy the most aggressive-looking tread is usually wrong. Published friction research shows deeper and wider grooves genuinely help on wet and detergent-covered floors, and do almost nothing on an oily one. The pattern that keeps a warehouse picker upright is not the pattern a groundworker needs, and the differences are measurable rather than a matter of taste. What the Tread Is Actually Fighting When a shoe lands on a contaminated floor, the liquid does not simply squash out of the way. It forms a pressurised layer between sole and floor, and for a moment that layer carries the load instead of the rubber. Slip research calls this the squeeze film. Grip returns only once the sole has broken through it and made real contact. A tread pattern attacks that problem in three ways at once, and every design is a compromise between them. Drainage. Grooves give the liquid somewhere to go. Without escape routes the film has nowhere to escape to and simply stays under the foot. Edges. Every groove wall is a leading edge that cuts into the film and wipes the surface. Edge count often matters more than lug height on a smooth floor. Contact. Whatever is left touching the floor is what generates friction. Cut too many grooves and you remove the very rubber that grips. Those three pull against each other. More grooves means better drainage and more edges but less contact area. That tension is the whole subject. The Two Numbers That Decide Grip Groove depth and groove width have both been measured properly in published ergonomics research, and the findings are more specific than the marketing suggests. 1 to 5 mmGroove depths tested in the research 0.108Best recorded friction gain per extra mm 12 mmGroove width that performed best overall 2.5 mmMinimum cleat height in the standard On depth, researchers tested grooves from 1 mm to 5 mm across terrazzo, steel and vinyl floors under wet, water-detergent and oily conditions. Deeper grooves produced higher friction on wet and detergent-covered floors, with the average gain per extra millimetre falling between 0.018 and 0.108 depending on groove width, floor and contaminant. On the oily floor, depth made effectively no difference at all. On width, a companion study compared 3 mm, 6 mm, 9 mm and 12 mm grooves across leather, EVA, butadiene rubber and neolite soles. Wider grooves generally gave higher friction, and 12 mm performed best across the conditions tested. Again there was an exception, and again it was oil: on a floor covered in vegetable oil, groove design was ineffective. The oil finding is the important one Two separate studies reached the same conclusion from different angles. Tread geometry is a water and detergent solution. Against oil, the pattern stops being the answer and the compound becomes the answer. If your floor is oily, stop shopping for tread depth and start reading the outsole material. Where the Standard Actually Tests Your Sole EN ISO 20345:2022 made slip resistance a basic requirement for all safety footwear rather than an optional extra, and it tests two specific parts of the sole rather than the sole as a whole. Test Contaminant Minimum coefficient of friction Status Forward heel slip Soap solution 0.31 Basic requirement Backward forepart slip Soap solution 0.36 Basic requirement Forward heel slip Glycerine 0.19 Optional, needed for SR Backward forepart slip Glycerine 0.22 Optional, needed for SR Two things follow from this that change how you should look at a sole. The test surface is now a ceramic tile rather than steel, and the two contact points are the heel edge and the forepart. A tread pattern that is beautifully engineered through the middle of the sole and plain at the heel will not test well, because the middle of the sole is not where the standard looks. If you want the marking letters unpacked properly, we covered what SRA, SRB and SRC actually mean separately. The Patterns You Will Actually See Strip away the branding and almost every safety outsole is one of five geometries, or a hybrid of two. Pattern How it works Suits Weakness Deep lug or cleat Tall blocks with wide channels that bite into soft ground Mud, gravel, rough outdoor terrain Small contact area, so it can feel vague on smooth wet floors Herringbone or chevron Angled bars that channel liquid sideways and give edges in two directions General mixed use, the most common compromise Directional, so it performs unevenly in side-to-side movement Hexagonal or honeycomb Many short edges facing every direction with even contact Indoor floors, multi-directional work, forklift and picking Shallow channels clog quickly in mud or heavy debris Wave or ripple Continuous curved channels that move liquid across and off the sole Wet smooth floors, kitchens and washdown areas Fewer sharp leading edges than a blocky pattern Fine siped flat A near-flat pad cut with narrow slits that open under load Smooth hard floors, retail, healthcare, cleanrooms Almost no use on soft ground, and sipes close as they wear Why the Aggressive Lug Is Often the Wrong Answer Here is the trade-off drawn out, because it is the decision most buyers get backwards. The same three jobs, three different compromises Drainage, edges and contact area cannot all be maximised at once. Deep aggressive lug Contact areaLowTrade-off DrainageExcellent Self cleaningExcellent Best onSoft, rough, outdoor ground Wrong tool indoors Multi-directional Contact areaBalancedBest all round DrainageGood Self cleaningModerate Best onMixed indoor and yard work The sensible default Fine siped flat Contact areaHighTrade-off DrainageShallow but dense Self cleaningPoor Best onSmooth hard floors Useless off-road A deep lug pattern works on soft ground because the lugs sink in and the ground itself provides resistance against the block faces. On a polished warehouse floor nothing sinks into anything. All you have is the rubber touching the tile, and a tall-lug sole simply has less of it in contact. That is why the boot that felt planted on a muddy site can feel skittish crossing a wet loading bay, and it is not a fault in the boot. It is also why a shoe can carry good slip credentials and still feel wrong underfoot in your particular building, a gap we explored in whether SRC grip is even real anymore. Self Cleaning Versus Edge Density The second trade-off is about what happens after the first ten minutes of the shift. Wide, open channels shed mud, swarf and debris as the sole flexes. Narrow sipes do not. Pack a finely siped sole with wet plaster dust or dried mud and it becomes, functionally, a smooth flat pad, which is the worst possible surface on a wet floor. Conversely a wide-channel lug sole keeps clearing itself all day but never offers the edge density that smooth wet tile rewards. There is a detail in the standard that speaks directly to this. Where an outsole is cleated, the standard requires a minimum cleat height of 2.5 mm for the common construction types, rising to 4 mm on all-rubber and all-polymeric footwear, and it requires the cleats across a defined zone to be open to the side. That phrase matters. Channels that vent out through the edge of the sole can drain and self-clear. Closed pockets in the middle of a tread hold liquid rather than releasing it, and a pattern full of them is decorative rather than functional. A ten second check in the shop Turn the shoe over and trace one channel with your finger from the centre of the sole outwards. If it reaches the edge and exits, the pattern can drain. If it dead-ends in a closed shape, that part of the tread is holding water rather than moving it. The Heel Is Doing More Than You Think Most forward slips begin at heel strike, in the instant when the heel edge lands at an angle and the whole body weight is still arriving. The standard reflects this by testing the heel separately with the shoe tilted, which is why the rear edge of the outsole deserves more attention than it usually gets. What you want at the heel is a defined, reasonably sharp edge with channels running off it, not a rounded bumper. A heel that has been styled into a smooth curve looks modern and gives the film nothing to break against. Look at the back third of the sole as its own product, because that is effectively how it is assessed. Pattern and Compound Are One Decision A tread pattern is a shape cut into a material, and the material decides how that shape behaves. The same geometry in two different compounds gives two different shoes. Polyurethane is light and well cushioned and holds a moulded pattern crisply, which is why it dominates indoor safety trainers. It is the reason the fine, dense patterns exist at all. Rubber compounds are generally tougher and are the usual choice where heat resistance or abrasion matters, and rubber blends are what most deep-lug outdoor patterns are cut from. EVA is a cushioning layer rather than a contact surface, so an EVA midsole is almost always paired with a rubber or PU tread beneath it. If you are choosing between the two you will meet most often, PU and rubber outsoles compared for grip goes through the practical differences, and what a PU outsole actually is in an S1P shoe covers the material on its own terms. The point for this article is simply that a clever pattern in the wrong compound will disappoint, and the two cannot be assessed separately. The Ladder Grip Exception One tread feature exists for a job that has nothing to do with floors. Ladder grip, marked LG, is about the waist of the sole engaging a ladder rung rather than about friction against a flat surface, and it calls for a specific step or ledge in the instep area that most trainer-style outsoles simply do not have. It is worth knowing because it is the one case where a flat, smooth-waisted sole is actively disqualifying regardless of how good the rest of the pattern is. Our explainer on what LG means and how ladder grip is assessed covers the requirement, and the wider set of 2022 revisions is in what changed between the 2011 and 2022 standards. How to Read a Tread Pattern Before You Buy Name your floor first. Smooth tile, concrete, mud, metal grating or oily workshop. The floor picks the pattern, not the other way round. Check the heel edge. A defined edge with channels running off it, not a rounded styling feature. Trace a channel to the edge. Open channels drain. Closed pockets collect. Count edges, not millimetres. On smooth wet floors, many short leading edges beat a few tall blocks. Ask whether it will clog. Fine sipes on a site full of mud or dust will fill in within a shift. If the hazard is oil, change the question. The research is clear that geometry does not solve oil. Look at the compound and the certification instead. The Honest Verdict There is no best tread pattern, only a best match. The measurable findings point the same way every time: depth and width help on water and detergent, they do not help on oil, and every groove you add to improve drainage takes away contact area you were relying on. A pattern is a set of compromises tuned for a particular floor, and buying one tuned for someone else's floor is how people end up disappointed by a perfectly good shoe. The practical shortcut is to be honest about where you actually spend the shift. Most workers spend it indoors on hard smooth flooring, and for them a moderate multi-directional pattern with a well-defined heel will beat an aggressive lug every time, however capable the lug looks on the shelf. On ours: the Xnexz PulseX uses a PU outsole aimed at smooth, controlled indoor floors, and the StrideX pairs EVA with rubber for varied indoor surfaces. Neither is built for mud, rough outdoor terrain or ladder work, and if that is your day, a deep-lug boot from a specialist range is the honest answer rather than either of ours. If Your Floors Are Smooth and Indoors Try Xnexz in a real workday and tell us honestly how the grip, fit and comfort hold up, and what we should improve. If your work means mud, rough ground, ladders or oily floors, buy the footwear your safety officer specifies for those conditions. That comes first. View the PulseX View the StrideX Frequently Asked Questions Does a deeper tread mean better grip? On wet and detergent-covered floors, yes, within limits. Research testing grooves from 1 mm to 5 mm found friction gains of roughly 0.018 to 0.108 per extra millimetre depending on conditions. On oily floors depth made effectively no difference, and on smooth hard floors a very deep lug reduces contact area, which can lower grip. What is the best tread pattern for wet indoor floors? A pattern with many short leading edges and open channels that reach the edge of the sole, rather than tall widely spaced lugs. Hexagonal, fine siped and moderate multi-directional designs generally suit smooth wet floors better than aggressive outdoor lugs. Why do my boots grip on site but slip in the warehouse? Deep lugs work by sinking into soft ground, which a hard smooth floor does not allow. On tile or sealed concrete only the rubber actually touching the surface generates friction, and a tall-lug sole has less of it in contact than a flatter, denser pattern. What tread depth does the standard require? Where an outsole is cleated, the standard sets a minimum cleat height of 2.5 mm for common construction types and 4 mm for all-rubber and all-polymeric footwear. It also requires cleats across a defined zone to be open to the side so they can drain. Which part of the sole is slip tested? The heel and the forepart, not the middle. Under EN ISO 20345:2022 the basic requirement is a forward heel slip of at least 0.31 and a backward forepart slip of at least 0.36 on a ceramic tile with soap solution, with tighter glycerine tests needed for the SR marking. Does tread pattern help on oily floors? Very little. Two separate studies found groove depth and groove width were both ineffective at maintaining friction on oil-contaminated floors. Where oil is the hazard, the outsole compound and the relevant certification matter far more than the geometry. Do sipes wear out? Effectively yes. Sipes are narrow slits that open under load, so they lose function as the tread wears down and as they pack with dust, dried mud or plaster. A siped sole that has clogged behaves like a smooth pad, which is the worst case on a wet floor.
Safety Shoe Tread Patterns: Deeper Is Not Grippier
The tread on a safety shoe is not styling. It is a drainage system with a very short deadline. At heel strike your foot arrives on the floor in a few hundredths of a second, and in that window the sole has to push a film of water, detergent or oil out of the way and reach the surface underneath. The pattern is what decides whether it manages that. Which is why the instinct to buy the most aggressive-looking tread is usually wrong. Published friction research shows deeper and wider grooves genuinely help on wet and detergent-covered floors, and do almost nothing on an oily one. The pattern that keeps a warehouse picker upright is not the pattern a groundworker needs, and the differences are measurable rather than a matter of taste. What the Tread Is Actually Fighting When a shoe lands on a contaminated floor, the liquid does not simply squash out of the way. It forms a pressurised layer between sole and floor, and for a moment that layer carries the load instead of the rubber. Slip research calls this the squeeze film. Grip returns only once the sole has broken through it and made real contact. A tread pattern attacks that problem in three ways at once, and every design is a compromise between them. Drainage. Grooves give the liquid somewhere to go. Without escape routes the film has nowhere to escape to and simply stays under the foot. Edges. Every groove wall is a leading edge that cuts into the film and wipes the surface. Edge count often matters more than lug height on a smooth floor. Contact. Whatever is left touching the floor is what generates friction. Cut too many grooves and you remove the very rubber that grips. Those three pull against each other. More grooves means better drainage and more edges but less contact area. That tension is the whole subject. The Two Numbers That Decide Grip Groove depth and groove width have both been measured properly in published ergonomics research, and the findings are more specific than the marketing suggests. 1 to 5 mmGroove depths tested in the research 0.108Best recorded friction gain per extra mm 12 mmGroove width that performed best overall 2.5 mmMinimum cleat height in the standard On depth, researchers tested grooves from 1 mm to 5 mm across terrazzo, steel and vinyl floors under wet, water-detergent and oily conditions. Deeper grooves produced higher friction on wet and detergent-covered floors, with the average gain per extra millimetre falling between 0.018 and 0.108 depending on groove width, floor and contaminant. On the oily floor, depth made effectively no difference at all. On width, a companion study compared 3 mm, 6 mm, 9 mm and 12 mm grooves across leather, EVA, butadiene rubber and neolite soles. Wider grooves generally gave higher friction, and 12 mm performed best across the conditions tested. Again there was an exception, and again it was oil: on a floor covered in vegetable oil, groove design was ineffective. The oil finding is the important one Two separate studies reached the same conclusion from different angles. Tread geometry is a water and detergent solution. Against oil, the pattern stops being the answer and the compound becomes the answer. If your floor is oily, stop shopping for tread depth and start reading the outsole material. Where the Standard Actually Tests Your Sole EN ISO 20345:2022 made slip resistance a basic requirement for all safety footwear rather than an optional extra, and it tests two specific parts of the sole rather than the sole as a whole. Test Contaminant Minimum coefficient of friction Status Forward heel slip Soap solution 0.31 Basic requirement Backward forepart slip Soap solution 0.36 Basic requirement Forward heel slip Glycerine 0.19 Optional, needed for SR Backward forepart slip Glycerine 0.22 Optional, needed for SR Two things follow from this that change how you should look at a sole. The test surface is now a ceramic tile rather than steel, and the two contact points are the heel edge and the forepart. A tread pattern that is beautifully engineered through the middle of the sole and plain at the heel will not test well, because the middle of the sole is not where the standard looks. If you want the marking letters unpacked properly, we covered what SRA, SRB and SRC actually mean separately. The Patterns You Will Actually See Strip away the branding and almost every safety outsole is one of five geometries, or a hybrid of two. Pattern How it works Suits Weakness Deep lug or cleat Tall blocks with wide channels that bite into soft ground Mud, gravel, rough outdoor terrain Small contact area, so it can feel vague on smooth wet floors Herringbone or chevron Angled bars that channel liquid sideways and give edges in two directions General mixed use, the most common compromise Directional, so it performs unevenly in side-to-side movement Hexagonal or honeycomb Many short edges facing every direction with even contact Indoor floors, multi-directional work, forklift and picking Shallow channels clog quickly in mud or heavy debris Wave or ripple Continuous curved channels that move liquid across and off the sole Wet smooth floors, kitchens and washdown areas Fewer sharp leading edges than a blocky pattern Fine siped flat A near-flat pad cut with narrow slits that open under load Smooth hard floors, retail, healthcare, cleanrooms Almost no use on soft ground, and sipes close as they wear Why the Aggressive Lug Is Often the Wrong Answer Here is the trade-off drawn out, because it is the decision most buyers get backwards. The same three jobs, three different compromises Drainage, edges and contact area cannot all be maximised at once. Deep aggressive lug Contact areaLowTrade-off DrainageExcellent Self cleaningExcellent Best onSoft, rough, outdoor ground Wrong tool indoors Multi-directional Contact areaBalancedBest all round DrainageGood Self cleaningModerate Best onMixed indoor and yard work The sensible default Fine siped flat Contact areaHighTrade-off DrainageShallow but dense Self cleaningPoor Best onSmooth hard floors Useless off-road A deep lug pattern works on soft ground because the lugs sink in and the ground itself provides resistance against the block faces. On a polished warehouse floor nothing sinks into anything. All you have is the rubber touching the tile, and a tall-lug sole simply has less of it in contact. That is why the boot that felt planted on a muddy site can feel skittish crossing a wet loading bay, and it is not a fault in the boot. It is also why a shoe can carry good slip credentials and still feel wrong underfoot in your particular building, a gap we explored in whether SRC grip is even real anymore. Self Cleaning Versus Edge Density The second trade-off is about what happens after the first ten minutes of the shift. Wide, open channels shed mud, swarf and debris as the sole flexes. Narrow sipes do not. Pack a finely siped sole with wet plaster dust or dried mud and it becomes, functionally, a smooth flat pad, which is the worst possible surface on a wet floor. Conversely a wide-channel lug sole keeps clearing itself all day but never offers the edge density that smooth wet tile rewards. There is a detail in the standard that speaks directly to this. Where an outsole is cleated, the standard requires a minimum cleat height of 2.5 mm for the common construction types, rising to 4 mm on all-rubber and all-polymeric footwear, and it requires the cleats across a defined zone to be open to the side. That phrase matters. Channels that vent out through the edge of the sole can drain and self-clear. Closed pockets in the middle of a tread hold liquid rather than releasing it, and a pattern full of them is decorative rather than functional. A ten second check in the shop Turn the shoe over and trace one channel with your finger from the centre of the sole outwards. If it reaches the edge and exits, the pattern can drain. If it dead-ends in a closed shape, that part of the tread is holding water rather than moving it. The Heel Is Doing More Than You Think Most forward slips begin at heel strike, in the instant when the heel edge lands at an angle and the whole body weight is still arriving. The standard reflects this by testing the heel separately with the shoe tilted, which is why the rear edge of the outsole deserves more attention than it usually gets. What you want at the heel is a defined, reasonably sharp edge with channels running off it, not a rounded bumper. A heel that has been styled into a smooth curve looks modern and gives the film nothing to break against. Look at the back third of the sole as its own product, because that is effectively how it is assessed. Pattern and Compound Are One Decision A tread pattern is a shape cut into a material, and the material decides how that shape behaves. The same geometry in two different compounds gives two different shoes. Polyurethane is light and well cushioned and holds a moulded pattern crisply, which is why it dominates indoor safety trainers. It is the reason the fine, dense patterns exist at all. Rubber compounds are generally tougher and are the usual choice where heat resistance or abrasion matters, and rubber blends are what most deep-lug outdoor patterns are cut from. EVA is a cushioning layer rather than a contact surface, so an EVA midsole is almost always paired with a rubber or PU tread beneath it. If you are choosing between the two you will meet most often, PU and rubber outsoles compared for grip goes through the practical differences, and what a PU outsole actually is in an S1P shoe covers the material on its own terms. The point for this article is simply that a clever pattern in the wrong compound will disappoint, and the two cannot be assessed separately. The Ladder Grip Exception One tread feature exists for a job that has nothing to do with floors. Ladder grip, marked LG, is about the waist of the sole engaging a ladder rung rather than about friction against a flat surface, and it calls for a specific step or ledge in the instep area that most trainer-style outsoles simply do not have. It is worth knowing because it is the one case where a flat, smooth-waisted sole is actively disqualifying regardless of how good the rest of the pattern is. Our explainer on what LG means and how ladder grip is assessed covers the requirement, and the wider set of 2022 revisions is in what changed between the 2011 and 2022 standards. How to Read a Tread Pattern Before You Buy Name your floor first. Smooth tile, concrete, mud, metal grating or oily workshop. The floor picks the pattern, not the other way round. Check the heel edge. A defined edge with channels running off it, not a rounded styling feature. Trace a channel to the edge. Open channels drain. Closed pockets collect. Count edges, not millimetres. On smooth wet floors, many short leading edges beat a few tall blocks. Ask whether it will clog. Fine sipes on a site full of mud or dust will fill in within a shift. If the hazard is oil, change the question. The research is clear that geometry does not solve oil. Look at the compound and the certification instead. The Honest Verdict There is no best tread pattern, only a best match. The measurable findings point the same way every time: depth and width help on water and detergent, they do not help on oil, and every groove you add to improve drainage takes away contact area you were relying on. A pattern is a set of compromises tuned for a particular floor, and buying one tuned for someone else's floor is how people end up disappointed by a perfectly good shoe. The practical shortcut is to be honest about where you actually spend the shift. Most workers spend it indoors on hard smooth flooring, and for them a moderate multi-directional pattern with a well-defined heel will beat an aggressive lug every time, however capable the lug looks on the shelf. On ours: the Xnexz PulseX uses a PU outsole aimed at smooth, controlled indoor floors, and the StrideX pairs EVA with rubber for varied indoor surfaces. Neither is built for mud, rough outdoor terrain or ladder work, and if that is your day, a deep-lug boot from a specialist range is the honest answer rather than either of ours. If Your Floors Are Smooth and Indoors Try Xnexz in a real workday and tell us honestly how the grip, fit and comfort hold up, and what we should improve. If your work means mud, rough ground, ladders or oily floors, buy the footwear your safety officer specifies for those conditions. That comes first. View the PulseX View the StrideX Frequently Asked Questions Does a deeper tread mean better grip? On wet and detergent-covered floors, yes, within limits. Research testing grooves from 1 mm to 5 mm found friction gains of roughly 0.018 to 0.108 per extra millimetre depending on conditions. On oily floors depth made effectively no difference, and on smooth hard floors a very deep lug reduces contact area, which can lower grip. What is the best tread pattern for wet indoor floors? A pattern with many short leading edges and open channels that reach the edge of the sole, rather than tall widely spaced lugs. Hexagonal, fine siped and moderate multi-directional designs generally suit smooth wet floors better than aggressive outdoor lugs. Why do my boots grip on site but slip in the warehouse? Deep lugs work by sinking into soft ground, which a hard smooth floor does not allow. On tile or sealed concrete only the rubber actually touching the surface generates friction, and a tall-lug sole has less of it in contact than a flatter, denser pattern. What tread depth does the standard require? Where an outsole is cleated, the standard sets a minimum cleat height of 2.5 mm for common construction types and 4 mm for all-rubber and all-polymeric footwear. It also requires cleats across a defined zone to be open to the side so they can drain. Which part of the sole is slip tested? The heel and the forepart, not the middle. Under EN ISO 20345:2022 the basic requirement is a forward heel slip of at least 0.31 and a backward forepart slip of at least 0.36 on a ceramic tile with soap solution, with tighter glycerine tests needed for the SR marking. Does tread pattern help on oily floors? Very little. Two separate studies found groove depth and groove width were both ineffective at maintaining friction on oil-contaminated floors. Where oil is the hazard, the outsole compound and the relevant certification matter far more than the geometry. Do sipes wear out? Effectively yes. Sipes are narrow slits that open under load, so they lose function as the tread wears down and as they pack with dust, dried mud or plaster. A siped sole that has clogged behaves like a smooth pad, which is the worst case on a wet floor.
SRA, SRB, SRC: What Do Those Letters Actually Mean?
The letters SRA, SRB and SRC tell you exactly one thing: which of two lab surfaces a safety shoe's outsole was dragged across, wet, and still held its grip on. That is it. It is not a general grip score, and it is not a ranking from weakest to strongest, however much the alphabet suggests otherwise. That single misreading, assuming SRC must be "the best" simply because it comes last in the sequence, is the most common mistake in the whole safety footwear label. This guide covers where slip ratings actually sit in the safety code, exactly what each test involves, why the three letters are not a ladder, what they explicitly do not cover, and the everyday habits that quietly undo a rating a shoe earned in the lab. Where SR Ratings Sit in the Safety Code Unlike antistatic performance, which comes bundled into S1 and every class above it, slip resistance is never assumed. It is always a separate, additional marking bolted onto the end of a class code, and it can be present or absent on a shoe of any class, from SB up to S7. Full label example How to read it SB (no SR letters) Basic toe protection only, no slip test carried out or passed S1P SRA S1P base certification, plus grip proven on a wet, soapy ceramic tile S3 SRB S3 base certification (already cleated for outdoor use), plus grip proven on an oily steel surface S1P SRC S1P base certification, plus grip proven on both the soapy-tile and the oily-steel surface S2 (no SR letters) S2 base certification, with no slip-resistance test attempted or on record Two shoes can carry the identical class code and differ only in whether the SR letters are there at all. If a product page or spec sheet doesn't mention SRA, SRB or SRC, that is not a hidden feature you missed. It usually means the test simply wasn't run. Our guide to safety shoe ratings from SB to S7 covers how the base class codes fit together; this piece is about the letters that get added on top. Why Slips Are the Injury Nobody Plans For A slip happens when the friction between a sole and a floor drops below what's needed to support a step, usually because a liquid, film or fine layer has come between the two. According to Health and Safety Executive figures for 2024/25, slips, trips and falls on the same level account for roughly three in every ten non-fatal injuries reported by employers, making them the single most common cause of workplace injury in Great Britain, ahead of manual handling, being struck by an object and falls from height. What makes slips distinct from most other workplace hazards is how ordinary the moment usually is. Nobody slips while doing something unusual. It happens carrying a tray across a kitchen, wheeling a trolley over a freshly mopped aisle, or stepping off a delivery van onto a wet pavement, the kind of step taken hundreds of times a shift without a second thought. Slip-resistant footwear exists because that ordinary step is where the risk actually lives, and because the floor itself is rarely something a worker controls. Inside the SR Test, Step by Step Both tests are carried out under EN ISO 13287, referenced from EN ISO 20345:2011, and the shoe is measured in two separate ways on each surface: a forward heel slip and a forward flat slip. 0.28Min. CoF, SRA forward heel slip 0.32Min. CoF, SRA forward flat slip 0.13Min. CoF, SRB forward heel slip 0.18Min. CoF, SRB forward flat slip Mount the sole on the rig. The footwear is fixed to a test machine that reproduces two contact patterns: a forward heel slip, with the heel angled at roughly 7° to the surface and sliding forward, and a forward flat slip, where most of the heel and part of the forepart are in contact and sliding. Wet a ceramic tile with diluted soap. A ceramic floor tile is wetted with a dilute sodium lauryl sulphate (SLS) solution, essentially a soap-and-water film. Both slip patterns are run across it and the coefficient of friction (CoF) is recorded each time. Clearing both minimums here earns SRA. Wet a steel plate with glycerol. The tile is swapped for a smooth stainless steel surface, wetted with glycerol, a much thicker, oil-like lubricant. Both slip patterns are run again. Clearing both minimums on this surface earns SRB. Combine or keep them separate. A sole that clears both surfaces earns SRC. A sole that clears only one keeps that single letter. A sole that clears neither carries no SR marking at all, the base class certification still stands, but no slip claim is made. What the test deliberately leaves out The standard states plainly that this testing does not apply to footwear with integrated studs or spikes, nor to special-purpose footwear intended for soft ground such as sand or sludge. Those are assessed differently, because a lab tile and a construction site are not comparable surfaces. Why the Three Letters Are Not a Ranking It is tempting to read A, B, C as weak, medium, strong. That reading is wrong, and it matters because it can lead someone to choose the wrong sole for their actual floor. What each letter actually tells you Every rating is surface-specific, not a general grip score. SRA Tested onCeramic tile, diluted soapMin. 0.28 / 0.32 SimulatesWet, cleaned-down floors Common inKitchens, hospitality, cleaning-heavy sites The wet-floor standard SRC Tested onBoth surfaces above, back to backPassed both SimulatesWet-soapy and oily-metal scenarios, separately Common inMixed-hazard sites where both floors exist Broadest lab coverage, not an upgrade over SRA SRB Tested onSteel plate, glycerolMin. 0.13 / 0.18 SimulatesOily, greasy hard flooring Common inWorkshops, engineering, some food processing The oily-floor standard Look closely at the numbers and the myth falls apart on its own. SRB's own pass mark, 0.13 for heel slip and 0.18 for flat, sits well below SRA's 0.28 and 0.32. That is not because SRB soles grip worse; it is because an oily steel surface is a harder baseline to grip on at all, so the bar for "passing" that scenario was always going to sit lower. Reaching SRC therefore does not mean a sole outperforms an SRA-only sole on a soapy kitchen floor. It means the sole was also tested against a different hazard that the SRA test never touches. SRA, SRB, SRC and the New SR Marking Compared A second wrinkle is timing. EN ISO 20345 has moved to a 2022 revision, and slip resistance is one of the sections it changed most. Property SRA SRB SRC SR (2022 standard) Surface Ceramic tile Steel plate Both, separately Ceramic tile only Lubricant Diluted soap (SLS) Glycerol Both Soap (baseline) + optional glycerol Min. CoF (heel / flat) 0.28 / 0.32 0.13 / 0.18 Both thresholds above ≥0.31 forward heel, ≥0.36 backward forepart Status today Retired for new certificates Retired for new certificates Retired for new certificates Current mandatory baseline Under the 2022 revision, basic slip resistance is no longer an optional extra for any class, every certified safety shoe must clear it, and it stops carrying its own letter because it is simply assumed, the same way antistatic already was. The old SRB test disappears entirely rather than being replaced letter for letter; the optional glycerol test that remains is now run on ceramic tile, not steel, which is intended to reflect real oily-floor conditions more closely than the old setup did. Shoes already certified under the 2011 standard keep their existing SRA, SRB or SRC marking until that certificate expires, so both systems are visible on shelves for some time yet. What an SR Rating Does Not Do This is the part most spec sheets skip past, and it is where a genuinely useful rating gets over-trusted. It is not tested on your actual floor. A lab ceramic tile and a lab steel plate are standardised references. Vinyl, painted concrete, chequer plate, quarry tile and polished screed all behave differently, and none of them are the surface the certificate was earned on. It does not cover most real contaminants. Soap and glycerol are the only two liquids tested. Ice, standing water, flour dust, sawdust, loose grit and mud sit entirely outside SRA, SRB and SRC. It excludes specialist footwear by design. Studded or spiked soles and footwear built for soft ground are not assessed by this test at all, because the standard itself says the comparison doesn't hold. It is not permanent. A worn, smoothed-off tread does not retain the coefficient of friction that earned its original marking, even though the label on the box hasn't changed. It is not a fix for a genuinely unsafe floor. Footwear is one half of the contact. A badly maintained, flooded or poorly designed floor can defeat even a well-graded sole. A detail worth knowing before you assume "highest is best" SRC's fine, closely-packed cleat pattern is built to drain thin films of liquid off a hard, flat surface quickly. On loose outdoor ground, mud, gravel, wet grass, those same small channels can clog, and a chunkier, less "certified" tread can end up gripping better. Match the sole to the floor a worker actually stands on, not to whichever letter sounds most impressive. Where a Specific SR Rating Is Genuinely Required For most workers the rating is a background detail. For a smaller group it is a specified requirement, because their floor and their contaminant are known in advance. Commercial kitchens and food prep. Washing down, spills and steam create exactly the wet, soapy scenario the SRA test measures. Hospitality and catering are the textbook case for this letter specifically. Workshops, garages and engineering floors. Oil and grease on hard flooring is the SRB scenario. Mechanics, engineering assembly and similar trades commonly look for at least SRB, often SRC. Sites with more than one hazard in a shift. Warehouses and food processing plants where staff move between a wet cleaning area and an oily mechanical area in the same day are the natural fit for SRC, precisely because both surfaces genuinely exist on-site. Sites with a documented floor-safety policy. Some employers name a specific SR marking in writing as part of their risk assessment or PPE policy. That written requirement outranks any general advice, including ours, and our guide to the UK PPE at Work Regulations covers where that duty sits. What Quietly Kills Slip Resistance in the Field A sole that passed comfortably in the lab can stop performing on-site without anyone noticing, because the tread still looks like a tread. Worn-smooth tread. Repeated flexing rounds off the sharp edges that actually create grip. The coefficient of friction can drop well below the original rating long before the sole looks obviously bald. Contamination filling the channels. Dried grease, compacted flour, plaster dust or a built-up layer of grime fills the grooves designed to clear liquid away, turning a well-engineered tread into an effectively smooth one. The wrong tread for the actual floor. As above, a fine-drainage sole built for hard indoor flooring can clog and underperform on loose mud, gravel or outdoor terrain. Liquid that outpaces the drainage. Every tread has a limit. A genuinely flooded floor or a heavy spill can beat any rated sole regardless of the letters on the label. Cold and stiff rubber. Rubber compounds firm up in low temperatures, which can reduce real-world grip in outdoor or cold-store work even when the sole is otherwise in good condition. How to Keep Yours Actually Gripping There is no in-house resistance test for slip performance the way there is for antistatic footwear, so the routine here is more visual and more about matching the sole to the job. A Sensible Routine Check tread depth regularly, especially on footwear used on frequently wet or washed-down floors. Clean grease, plaster, flour or heavy dust off the outsole before it compacts into the tread. Match the sole type to the real floor and task — a fine-groove sole for smooth wet kitchens, a chunkier tread for outdoor or loose ground. Reassess footwear choice if a workplace changes flooring or a role starts covering a different kind of surface. Replace rather than keep wearing a pair with visibly smoothed, cracked or heavily clogged tread. Report and clear spills promptly. No sole compensates fully for a genuinely flooded floor. The Limits of SR Ratings SRA, SRB and SRC are useful precisely because they are specific. Each one tells you a sole was measured against a defined surface and a defined liquid, and cleared a defined coefficient of friction on both a heel slip and a flat slip. That is real, checkable information. What it is not is a single scorecard running from weak to strong, a guarantee on any floor other than the two tested, or something that survives a worn-smooth tread and a compacted layer of grime. The letter that matters is the one that matches the floor a person actually works on, not the one that sounds the most complete. For the record on ours: both the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, and each carries an outsole built with everyday grip in mind, PulseX's PU sole for smooth, fast-moving days, StrideX's EVA and rubber sole for mixed and uneven terrain. Slip resistance sits outside the S1P baseline, so if your site specifies a particular SRA, SRB, SRC or SR marking in writing, check the current product listing or ask us directly rather than assuming. Try Xnexz and Tell Us How the Grip Holds Up Wear PulseX or StrideX through a real working week and let us know honestly how the fit, comfort and grip perform on your actual floor. If your site specifies a documented SR rating, conductive footwear or a higher class, follow what your safety officer has written down. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does SRA mean on a safety shoe? SRA means the sole was tested on a ceramic tile wetted with a diluted soap solution and cleared the minimum coefficient of friction in both a forward heel slip and a forward flat slip. It reflects grip on wet, soapy floors specifically. Is SRC better than SRA? Not in the way most people assume. SRC means the sole passed both the SRA test and the SRB test, but SRB's own pass mark is lower than SRA's. SRC is broader coverage, not a higher grip score on a soapy floor. What is the difference between SRA, SRB and SRC? SRA is tested on a wet, soapy ceramic tile. SRB is tested on an oily steel surface using glycerol. SRC means the sole passed both tests, on their respective surfaces. Are SRA, SRB and SRC still used on new safety shoes? New certifications are moving to EN ISO 20345:2022, which drops these letters and makes basic slip resistance mandatory for every class instead. Footwear still certified under the 2011 standard keeps its existing SRA, SRB or SRC marking until that certificate expires. Is a higher slip rating always safer? No. The right rating is the one that matches the actual floor and contaminant a person works on. A fine-cleated SRC sole can underperform a chunkier tread on loose mud or gravel, for example. Do slip ratings wear out? The certificate doesn't expire on a schedule, but the physical grip does. Worn, smoothed or heavily contaminated tread stops delivering the coefficient of friction that earned the original rating. Are S1P safety shoes automatically slip resistant? Not automatically. Slip resistance is always a separate, additional marking, not part of the S1P base requirement. Check the specific product for an SRA, SRB, SRC or SR marking rather than assuming it from the class code alone. Which slip rating do I need for my job? Match the letter to the hazard: SRA for wet, soapy floors such as kitchens, SRB for oily or greasy hard flooring, and SRC where both hazards genuinely exist on the same site. A documented workplace policy always takes priority over general advice.
SRA, SRB, SRC: What Do Those Letters Actually Mean?
The letters SRA, SRB and SRC tell you exactly one thing: which of two lab surfaces a safety shoe's outsole was dragged across, wet, and still held its grip on. That is it. It is not a general grip score, and it is not a ranking from weakest to strongest, however much the alphabet suggests otherwise. That single misreading, assuming SRC must be "the best" simply because it comes last in the sequence, is the most common mistake in the whole safety footwear label. This guide covers where slip ratings actually sit in the safety code, exactly what each test involves, why the three letters are not a ladder, what they explicitly do not cover, and the everyday habits that quietly undo a rating a shoe earned in the lab. Where SR Ratings Sit in the Safety Code Unlike antistatic performance, which comes bundled into S1 and every class above it, slip resistance is never assumed. It is always a separate, additional marking bolted onto the end of a class code, and it can be present or absent on a shoe of any class, from SB up to S7. Full label example How to read it SB (no SR letters) Basic toe protection only, no slip test carried out or passed S1P SRA S1P base certification, plus grip proven on a wet, soapy ceramic tile S3 SRB S3 base certification (already cleated for outdoor use), plus grip proven on an oily steel surface S1P SRC S1P base certification, plus grip proven on both the soapy-tile and the oily-steel surface S2 (no SR letters) S2 base certification, with no slip-resistance test attempted or on record Two shoes can carry the identical class code and differ only in whether the SR letters are there at all. If a product page or spec sheet doesn't mention SRA, SRB or SRC, that is not a hidden feature you missed. It usually means the test simply wasn't run. Our guide to safety shoe ratings from SB to S7 covers how the base class codes fit together; this piece is about the letters that get added on top. Why Slips Are the Injury Nobody Plans For A slip happens when the friction between a sole and a floor drops below what's needed to support a step, usually because a liquid, film or fine layer has come between the two. According to Health and Safety Executive figures for 2024/25, slips, trips and falls on the same level account for roughly three in every ten non-fatal injuries reported by employers, making them the single most common cause of workplace injury in Great Britain, ahead of manual handling, being struck by an object and falls from height. What makes slips distinct from most other workplace hazards is how ordinary the moment usually is. Nobody slips while doing something unusual. It happens carrying a tray across a kitchen, wheeling a trolley over a freshly mopped aisle, or stepping off a delivery van onto a wet pavement, the kind of step taken hundreds of times a shift without a second thought. Slip-resistant footwear exists because that ordinary step is where the risk actually lives, and because the floor itself is rarely something a worker controls. Inside the SR Test, Step by Step Both tests are carried out under EN ISO 13287, referenced from EN ISO 20345:2011, and the shoe is measured in two separate ways on each surface: a forward heel slip and a forward flat slip. 0.28Min. CoF, SRA forward heel slip 0.32Min. CoF, SRA forward flat slip 0.13Min. CoF, SRB forward heel slip 0.18Min. CoF, SRB forward flat slip Mount the sole on the rig. The footwear is fixed to a test machine that reproduces two contact patterns: a forward heel slip, with the heel angled at roughly 7° to the surface and sliding forward, and a forward flat slip, where most of the heel and part of the forepart are in contact and sliding. Wet a ceramic tile with diluted soap. A ceramic floor tile is wetted with a dilute sodium lauryl sulphate (SLS) solution, essentially a soap-and-water film. Both slip patterns are run across it and the coefficient of friction (CoF) is recorded each time. Clearing both minimums here earns SRA. Wet a steel plate with glycerol. The tile is swapped for a smooth stainless steel surface, wetted with glycerol, a much thicker, oil-like lubricant. Both slip patterns are run again. Clearing both minimums on this surface earns SRB. Combine or keep them separate. A sole that clears both surfaces earns SRC. A sole that clears only one keeps that single letter. A sole that clears neither carries no SR marking at all, the base class certification still stands, but no slip claim is made. What the test deliberately leaves out The standard states plainly that this testing does not apply to footwear with integrated studs or spikes, nor to special-purpose footwear intended for soft ground such as sand or sludge. Those are assessed differently, because a lab tile and a construction site are not comparable surfaces. Why the Three Letters Are Not a Ranking It is tempting to read A, B, C as weak, medium, strong. That reading is wrong, and it matters because it can lead someone to choose the wrong sole for their actual floor. What each letter actually tells you Every rating is surface-specific, not a general grip score. SRA Tested onCeramic tile, diluted soapMin. 0.28 / 0.32 SimulatesWet, cleaned-down floors Common inKitchens, hospitality, cleaning-heavy sites The wet-floor standard SRC Tested onBoth surfaces above, back to backPassed both SimulatesWet-soapy and oily-metal scenarios, separately Common inMixed-hazard sites where both floors exist Broadest lab coverage, not an upgrade over SRA SRB Tested onSteel plate, glycerolMin. 0.13 / 0.18 SimulatesOily, greasy hard flooring Common inWorkshops, engineering, some food processing The oily-floor standard Look closely at the numbers and the myth falls apart on its own. SRB's own pass mark, 0.13 for heel slip and 0.18 for flat, sits well below SRA's 0.28 and 0.32. That is not because SRB soles grip worse; it is because an oily steel surface is a harder baseline to grip on at all, so the bar for "passing" that scenario was always going to sit lower. Reaching SRC therefore does not mean a sole outperforms an SRA-only sole on a soapy kitchen floor. It means the sole was also tested against a different hazard that the SRA test never touches. SRA, SRB, SRC and the New SR Marking Compared A second wrinkle is timing. EN ISO 20345 has moved to a 2022 revision, and slip resistance is one of the sections it changed most. Property SRA SRB SRC SR (2022 standard) Surface Ceramic tile Steel plate Both, separately Ceramic tile only Lubricant Diluted soap (SLS) Glycerol Both Soap (baseline) + optional glycerol Min. CoF (heel / flat) 0.28 / 0.32 0.13 / 0.18 Both thresholds above ≥0.31 forward heel, ≥0.36 backward forepart Status today Retired for new certificates Retired for new certificates Retired for new certificates Current mandatory baseline Under the 2022 revision, basic slip resistance is no longer an optional extra for any class, every certified safety shoe must clear it, and it stops carrying its own letter because it is simply assumed, the same way antistatic already was. The old SRB test disappears entirely rather than being replaced letter for letter; the optional glycerol test that remains is now run on ceramic tile, not steel, which is intended to reflect real oily-floor conditions more closely than the old setup did. Shoes already certified under the 2011 standard keep their existing SRA, SRB or SRC marking until that certificate expires, so both systems are visible on shelves for some time yet. What an SR Rating Does Not Do This is the part most spec sheets skip past, and it is where a genuinely useful rating gets over-trusted. It is not tested on your actual floor. A lab ceramic tile and a lab steel plate are standardised references. Vinyl, painted concrete, chequer plate, quarry tile and polished screed all behave differently, and none of them are the surface the certificate was earned on. It does not cover most real contaminants. Soap and glycerol are the only two liquids tested. Ice, standing water, flour dust, sawdust, loose grit and mud sit entirely outside SRA, SRB and SRC. It excludes specialist footwear by design. Studded or spiked soles and footwear built for soft ground are not assessed by this test at all, because the standard itself says the comparison doesn't hold. It is not permanent. A worn, smoothed-off tread does not retain the coefficient of friction that earned its original marking, even though the label on the box hasn't changed. It is not a fix for a genuinely unsafe floor. Footwear is one half of the contact. A badly maintained, flooded or poorly designed floor can defeat even a well-graded sole. A detail worth knowing before you assume "highest is best" SRC's fine, closely-packed cleat pattern is built to drain thin films of liquid off a hard, flat surface quickly. On loose outdoor ground, mud, gravel, wet grass, those same small channels can clog, and a chunkier, less "certified" tread can end up gripping better. Match the sole to the floor a worker actually stands on, not to whichever letter sounds most impressive. Where a Specific SR Rating Is Genuinely Required For most workers the rating is a background detail. For a smaller group it is a specified requirement, because their floor and their contaminant are known in advance. Commercial kitchens and food prep. Washing down, spills and steam create exactly the wet, soapy scenario the SRA test measures. Hospitality and catering are the textbook case for this letter specifically. Workshops, garages and engineering floors. Oil and grease on hard flooring is the SRB scenario. Mechanics, engineering assembly and similar trades commonly look for at least SRB, often SRC. Sites with more than one hazard in a shift. Warehouses and food processing plants where staff move between a wet cleaning area and an oily mechanical area in the same day are the natural fit for SRC, precisely because both surfaces genuinely exist on-site. Sites with a documented floor-safety policy. Some employers name a specific SR marking in writing as part of their risk assessment or PPE policy. That written requirement outranks any general advice, including ours, and our guide to the UK PPE at Work Regulations covers where that duty sits. What Quietly Kills Slip Resistance in the Field A sole that passed comfortably in the lab can stop performing on-site without anyone noticing, because the tread still looks like a tread. Worn-smooth tread. Repeated flexing rounds off the sharp edges that actually create grip. The coefficient of friction can drop well below the original rating long before the sole looks obviously bald. Contamination filling the channels. Dried grease, compacted flour, plaster dust or a built-up layer of grime fills the grooves designed to clear liquid away, turning a well-engineered tread into an effectively smooth one. The wrong tread for the actual floor. As above, a fine-drainage sole built for hard indoor flooring can clog and underperform on loose mud, gravel or outdoor terrain. Liquid that outpaces the drainage. Every tread has a limit. A genuinely flooded floor or a heavy spill can beat any rated sole regardless of the letters on the label. Cold and stiff rubber. Rubber compounds firm up in low temperatures, which can reduce real-world grip in outdoor or cold-store work even when the sole is otherwise in good condition. How to Keep Yours Actually Gripping There is no in-house resistance test for slip performance the way there is for antistatic footwear, so the routine here is more visual and more about matching the sole to the job. A Sensible Routine Check tread depth regularly, especially on footwear used on frequently wet or washed-down floors. Clean grease, plaster, flour or heavy dust off the outsole before it compacts into the tread. Match the sole type to the real floor and task — a fine-groove sole for smooth wet kitchens, a chunkier tread for outdoor or loose ground. Reassess footwear choice if a workplace changes flooring or a role starts covering a different kind of surface. Replace rather than keep wearing a pair with visibly smoothed, cracked or heavily clogged tread. Report and clear spills promptly. No sole compensates fully for a genuinely flooded floor. The Limits of SR Ratings SRA, SRB and SRC are useful precisely because they are specific. Each one tells you a sole was measured against a defined surface and a defined liquid, and cleared a defined coefficient of friction on both a heel slip and a flat slip. That is real, checkable information. What it is not is a single scorecard running from weak to strong, a guarantee on any floor other than the two tested, or something that survives a worn-smooth tread and a compacted layer of grime. The letter that matters is the one that matches the floor a person actually works on, not the one that sounds the most complete. For the record on ours: both the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, and each carries an outsole built with everyday grip in mind, PulseX's PU sole for smooth, fast-moving days, StrideX's EVA and rubber sole for mixed and uneven terrain. Slip resistance sits outside the S1P baseline, so if your site specifies a particular SRA, SRB, SRC or SR marking in writing, check the current product listing or ask us directly rather than assuming. Try Xnexz and Tell Us How the Grip Holds Up Wear PulseX or StrideX through a real working week and let us know honestly how the fit, comfort and grip perform on your actual floor. If your site specifies a documented SR rating, conductive footwear or a higher class, follow what your safety officer has written down. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does SRA mean on a safety shoe? SRA means the sole was tested on a ceramic tile wetted with a diluted soap solution and cleared the minimum coefficient of friction in both a forward heel slip and a forward flat slip. It reflects grip on wet, soapy floors specifically. Is SRC better than SRA? Not in the way most people assume. SRC means the sole passed both the SRA test and the SRB test, but SRB's own pass mark is lower than SRA's. SRC is broader coverage, not a higher grip score on a soapy floor. What is the difference between SRA, SRB and SRC? SRA is tested on a wet, soapy ceramic tile. SRB is tested on an oily steel surface using glycerol. SRC means the sole passed both tests, on their respective surfaces. Are SRA, SRB and SRC still used on new safety shoes? New certifications are moving to EN ISO 20345:2022, which drops these letters and makes basic slip resistance mandatory for every class instead. Footwear still certified under the 2011 standard keeps its existing SRA, SRB or SRC marking until that certificate expires. Is a higher slip rating always safer? No. The right rating is the one that matches the actual floor and contaminant a person works on. A fine-cleated SRC sole can underperform a chunkier tread on loose mud or gravel, for example. Do slip ratings wear out? The certificate doesn't expire on a schedule, but the physical grip does. Worn, smoothed or heavily contaminated tread stops delivering the coefficient of friction that earned the original rating. Are S1P safety shoes automatically slip resistant? Not automatically. Slip resistance is always a separate, additional marking, not part of the S1P base requirement. Check the specific product for an SRA, SRB, SRC or SR marking rather than assuming it from the class code alone. Which slip rating do I need for my job? Match the letter to the hazard: SRA for wet, soapy floors such as kitchens, SRB for oily or greasy hard flooring, and SRC where both hazards genuinely exist on the same site. A documented workplace policy always takes priority over general advice.
Antistatic Safety Shoes: You Already Have It, Probably
The 'A' on a safety shoe stands for antistatic, and it describes something more precise than most people assume. It is not a coating, a feature or a bonus. It is a measured electrical property: the shoe must let charge drain from your body to the floor at a controlled speed, neither too fast nor too slow, and it has to prove that in a laboratory under two different humidity conditions. It is also the most misunderstood marking in safety footwear, because the word "antistatic" sounds protective in a way the rating does not support. This guide covers the whole thing properly: where A sits in the code, what the test involves step by step, why the permitted window has a floor as well as a ceiling, what the rating explicitly does not do, and the everyday habits that quietly stop it working. Where the 'A' Sits in the Safety Code Antistatic is not an optional extra you hunt for. It is written into the base requirements of almost every safety footwear class, which is why so few product pages bother to mention it. If your shoe is S1 or higher, it is antistatic by definition. Class Antistatic included What else the class adds SB No, unless separately marked A 200J toe cap and the basic requirements only S1 Yes Closed heel region and energy absorption at the heel S1P Yes S1 plus a perforation-resistant midsole S2 Yes S1 plus water penetration and absorption resistance of the upper S3 Yes S2 plus perforation resistance and a cleated outsole S6 and S7 Yes The newer classes built around a waterproof construction SB is the one to watch. A pure SB shoe covers the toe cap and the basic requirements, and nothing more, so antistatic performance is not assumed. If you see SB alone on a label and you need antistatic, look for an explicit A alongside it. Our guide to safety shoe ratings from SB to S7 lays out how the whole ladder fits together. What Static Actually Does to a Person at Work Walking generates charge. Every step separates your sole from the floor surface, and that separation transfers electrons between the two materials. On an insulating floor in dry air, a person can accumulate a surprising amount of charge simply by crossing a room, and because the body is a conductor, that charge sits waiting for somewhere to go. It goes somewhere in one of three ways, and each is a different kind of problem. The nuisance shock. You touch a door handle, a rack or a colleague and feel a sharp sting. Harmless in itself, but a flinch at the wrong moment near machinery, a ladder or a load is not harmless at all. The ignition risk. In an atmosphere containing flammable vapour, fine dust or powder, a spark from a discharging person can be enough to ignite it. The Health and Safety Executive is direct about this, advising that measures such as earth bonding and antistatic clothing and footwear help reduce the risk of static discharges in potentially explosive atmospheres. Component damage. Electronic components can be degraded by a discharge far below the threshold a person can feel. This is a real hazard, but it is governed by a separate and stricter specification. Antistatic footwear addresses the first two directly and the third only partly. The shoe works as a deliberate leak path: rather than letting charge build and release in one sudden spark, it bleeds continuously away to the floor. Inside the A Test, Step by Step The test in ISO 20344 is more demanding than most people expect, mainly because of the conditioning. A shoe does not simply get measured once on a bench. 7 daysConditioning in each atmosphere 4 kgSteel balls loaded into the shoe 100 VDC test voltage applied 1 minHow long the voltage is held Condition in dry air. The footwear spends seven days at 20°C and around 30 per cent relative humidity. This is the harsh case, because dry air is where static builds most readily and where materials tend to read as more insulating. Load the shoe. Four kilograms of steel balls go inside the shoe, sitting on a copper base plate, with a copper connection plate pressed down into the balls. The balls stand in for the foot, giving consistent, repeatable contact with the whole inner surface. Apply the voltage. 100 volts DC is applied for one minute and the resistance between the inside of the shoe and the plate beneath it is measured. Condition in damp air. The sample is then conditioned again, seven days at 20°C and around 85 per cent relative humidity, and measured a second time. Pass both, or fail. The resistance must land above 0.1 MΩ and at or below 1,000 MΩ in dry and damp conditions. A shoe that passes dry but drops out of range when humid does not earn the A. Why the double conditioning matters Humidity changes how materials conduct. Many everyday materials become noticeably more conductive when damp and more insulating when dry. Requiring the shoe to stay inside one window across both extremes is what makes the A rating meaningful rather than a lucky reading on a good day. Why Both Ends of the Window Matter A single upper limit would be simpler. The standard sets a floor as well, and the reason is worth understanding because it explains why "more conductive" is not "better". The three electrical bands of work footwear Resistance measured between the inside of the shoe and the surface beneath it. Conductive Resistance0.1 MΩ or belowMarked C Charge drainsVery quickly The trade-offLess resistance between you and any live circuit Specialist use only Antistatic ResistanceAbove 0.1 MΩ to 1,000 MΩMarked A Charge drainsSteadily and controllably The trade-offA deliberate compromise between both risks The everyday choice Insulating ResistanceAbove 1,000 MΩNot A Charge drainsPoorly, so it stays on you The trade-offHigher risk of a sudden spark discharge Fails the A requirement So the floor at 0.1 MΩ exists to keep some resistance between your foot and the ground, and the ceiling at 1,000 MΩ exists to stop charge accumulating on you. Antistatic sits deliberately in the middle. It is not a weaker version of conductive footwear, it is a different answer to a two-sided problem. Conductive, Antistatic and Insulating Are Three Different Ratings These three get used loosely in conversation and they are not interchangeable. Electrically insulating footwear in particular is a separate product category with its own standard and its own withstand-voltage testing, and it is not something an S1P shoe quietly provides. Property Conductive (C) Antistatic (A) Electrically insulating Purpose Drain charge as fast as possible Drain charge at a controlled rate Isolate the wearer from electrical potential Resistance 0.1 MΩ or below Above 0.1 MΩ to 1,000 MΩ Tested by withstand voltage, not this scale Included in S1P No Yes No Typical use Tightly controlled environments where any retained charge is unacceptable General industry, warehousing, workshops, light trade Specified electrical work under its own rules Suitable for live working No No Only within its own certified scope What the A Rating Does Not Do This is the section that matters most, and the one most product pages skip. The A rating has hard limits, and the standard's own user information states them plainly. It is not electric shock protection. Antistatic footwear is not suitable for work on live electrical installations. It introduces resistance between the foot and the ground, and the accompanying user information is explicit that this cannot guarantee adequate protection against electric shock. It is not ESD certification. ESD footwear sits in a much narrower band under a different standard, and an A-rated shoe will not satisfy an ESD-protected area. We went through the gap in detail in ESD vs antistatic shoes, including why every ESD shoe is antistatic but the reverse is never true. It is not a complete answer to static on its own. The shoe is one part of a path that runs from your skin, through your sock, through the shoe, to the floor. Break any link and the path fails. It is not permanent. The standard's user information warns that the electrical resistance of antistatic footwear can be changed significantly by bending, contamination or moisture, and that the footwear might not perform its intended function when worn in wet conditions. A detail buried in the user information Class I footwear, made from leather and other materials rather than an all-rubber or all-polymeric construction, can absorb moisture over a long shift and become progressively more conductive. Where prolonged wet exposure is likely, the standard points towards Class II all-rubber or all-polymeric footwear instead. Where Antistatic Footwear Is Genuinely Required Because A comes bundled with S1 and above, most workers have it without ever asking for it. There is a smaller group for whom it is not incidental but specified, and for them the marking is a compliance item rather than a nice extra. Flammable and explosive atmospheres. Fuel handling, solvent work, paint spraying, and anywhere covered by dangerous substances regulations. Here the discharge is an ignition source, and footwear forms part of a wider static control approach alongside earth bonding and suitable clothing. Fine powder and dust environments. Flour milling, sugar, certain plastics and pharmaceutical powders can form an ignitable dust cloud, and static is a recognised ignition source in those settings. Electronics and precision assembly. Antistatic is the entry level here. Where components are genuinely sensitive, the site will specify ESD instead, which is stricter. Sites with a documented static control policy. Some warehouses, data centres and healthcare settings simply require it in writing, and that written requirement outranks every opinion, including ours. The decision never belongs to the product page. Your employer's risk assessment and PPE policy determine what you need, and our guide to the UK PPE at Work Regulations covers where that duty actually sits and who carries it. What Quietly Kills Antistatic Performance A shoe that passed in a laboratory can stop performing in a workplace without anyone noticing, because nothing visible changes. These are the common causes. Replacement insoles. The charge path runs up through the footbed. A thick aftermarket insole from a sports shop can interrupt it entirely, and the shoe will look completely normal while doing so. Insulating socks. Heavy synthetic or thickly cushioned socks sit directly in the path between skin and shoe. Thin natural-fibre socks generally interfere less. Contamination on the outsole. Dried paint, adhesive, plaster, oil or a compacted layer of dust forms an insulating film across the contact surface. Moisture and prolonged damp. Water shifts readings in both directions, and the standard flags wet conditions specifically as a scenario where performance may not hold. Insulating floor coverings. A rubber mat, a thick epoxy coating or carpet breaks the final link to earth. Antistatic footwear on an insulating floor has nowhere to send the charge. Ordinary wear and flexing. Repeated bending changes the material over time, which is precisely why the standard recommends periodic retesting rather than trusting the original certificate indefinitely. How to Check Yours Is Still Working The standard does not treat the A rating as a one-off certificate. Its user information recommends that the employer establish an in-house test for electrical resistance, carried out at regular and frequent intervals. In practice that ranges from a footwear tester at the entrance, common on electronics and static-controlled sites, to a periodic check with a suitable resistance meter as part of PPE inspection. If your workplace depends on antistatic footwear and nobody is measuring anything, the paperwork says compliant while the reality is unverified. For a broader view of what the class code promises and what it does not, what S1P certification actually covers is the companion piece to this one. A Sensible Routine Keep the original insole in the shoe unless the manufacturer offers a replacement that maintains the rating. Clean the outsole when it picks up paint, adhesive or heavy dust, rather than letting it build. Treat a soaked pair as untrusted until dry, in any setting where static control genuinely matters. Retest after any significant contamination event, not just on a calendar schedule. Replace rather than nurse a pair with a worn, cracked or heavily contaminated outsole. The Limits of the 'A' Rating The A rating is a narrow, well-defined electrical property, and its value lies in how specific it is. It means a laboratory measured your footwear at 100 volts after a fortnight of conditioning across two humidity extremes, and found it sat inside a band chosen to balance two competing risks. That is a genuinely useful thing to know. What it is not is protection from electric shock, a substitute for ESD certification, or a property that survives a thick aftermarket insole and a floor mat. Most workers already have it, because S1 and above include it as standard. The ones who depend on it are better served by understanding the whole path from skin to floor than by trusting the letter on the label and stopping there. For the record on ours: the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, so antistatic performance is part of that certification, and they are designed to help disperse static build-up in suitable everyday work settings. They are not ESD-tested, and if your site runs an ESD-protected area you need a current ESD-certified product instead. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your site specifies ESD, conductive footwear or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does the A rating mean on safety shoes? A means antistatic. The footwear has been measured and found to have an electrical resistance above 0.1 MΩ and no greater than 1,000 MΩ, so it drains static charge from the wearer to the floor at a controlled rate rather than letting it build up and discharge as a spark. Are all S1P safety shoes antistatic? Yes. Antistatic performance is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classes. SB is the exception, since a pure SB shoe covers only the toe cap and basic requirements unless it is separately marked A. Does antistatic footwear protect against electric shock? No. Antistatic footwear is not suitable for work on live electrical installations. It adds resistance between the foot and the ground, which is not the same as electrical insulation, and the user information supplied with it states that it cannot guarantee adequate protection against electric shock. How is antistatic footwear tested? The shoe is conditioned for seven days in dry air at around 30 per cent humidity, then loaded with 4 kg of steel balls on a copper plate, and 100 volts DC is applied for one minute while resistance is measured. It is then conditioned for another seven days in damp air at around 85 per cent humidity and measured again. It must sit within the permitted band in both conditions. What is the difference between antistatic and conductive footwear? Conductive footwear, marked C, measures 0.1 MΩ or below and drains charge as quickly as possible. Antistatic, marked A, sits above 0.1 MΩ and up to 1,000 MΩ and drains it at a controlled rate. The antistatic floor exists so that some resistance remains between the wearer and the ground. Can I put my own insoles in antistatic shoes? It is best avoided. The static path runs from your foot through the footbed and out through the sole, so a thick aftermarket insole can interrupt it without any visible sign. If you need a different insole, ask the manufacturer whether one is available that maintains the rating. How long does the antistatic property last? There is no fixed lifespan. The standard's user information notes that electrical resistance can change significantly with bending, contamination or moisture, and recommends that employers set up an in-house resistance test carried out at regular and frequent intervals rather than relying on the original certificate. Do antistatic shoes work on any floor? No. The footwear is only one part of the path to earth. A rubber mat, thick coating or carpet can break that path, leaving the charge with nowhere to go regardless of how good the footwear is. Where static control genuinely matters, the flooring is specified alongside the footwear.
Antistatic Safety Shoes: You Already Have It, Probably
The 'A' on a safety shoe stands for antistatic, and it describes something more precise than most people assume. It is not a coating, a feature or a bonus. It is a measured electrical property: the shoe must let charge drain from your body to the floor at a controlled speed, neither too fast nor too slow, and it has to prove that in a laboratory under two different humidity conditions. It is also the most misunderstood marking in safety footwear, because the word "antistatic" sounds protective in a way the rating does not support. This guide covers the whole thing properly: where A sits in the code, what the test involves step by step, why the permitted window has a floor as well as a ceiling, what the rating explicitly does not do, and the everyday habits that quietly stop it working. Where the 'A' Sits in the Safety Code Antistatic is not an optional extra you hunt for. It is written into the base requirements of almost every safety footwear class, which is why so few product pages bother to mention it. If your shoe is S1 or higher, it is antistatic by definition. Class Antistatic included What else the class adds SB No, unless separately marked A 200J toe cap and the basic requirements only S1 Yes Closed heel region and energy absorption at the heel S1P Yes S1 plus a perforation-resistant midsole S2 Yes S1 plus water penetration and absorption resistance of the upper S3 Yes S2 plus perforation resistance and a cleated outsole S6 and S7 Yes The newer classes built around a waterproof construction SB is the one to watch. A pure SB shoe covers the toe cap and the basic requirements, and nothing more, so antistatic performance is not assumed. If you see SB alone on a label and you need antistatic, look for an explicit A alongside it. Our guide to safety shoe ratings from SB to S7 lays out how the whole ladder fits together. What Static Actually Does to a Person at Work Walking generates charge. Every step separates your sole from the floor surface, and that separation transfers electrons between the two materials. On an insulating floor in dry air, a person can accumulate a surprising amount of charge simply by crossing a room, and because the body is a conductor, that charge sits waiting for somewhere to go. It goes somewhere in one of three ways, and each is a different kind of problem. The nuisance shock. You touch a door handle, a rack or a colleague and feel a sharp sting. Harmless in itself, but a flinch at the wrong moment near machinery, a ladder or a load is not harmless at all. The ignition risk. In an atmosphere containing flammable vapour, fine dust or powder, a spark from a discharging person can be enough to ignite it. The Health and Safety Executive is direct about this, advising that measures such as earth bonding and antistatic clothing and footwear help reduce the risk of static discharges in potentially explosive atmospheres. Component damage. Electronic components can be degraded by a discharge far below the threshold a person can feel. This is a real hazard, but it is governed by a separate and stricter specification. Antistatic footwear addresses the first two directly and the third only partly. The shoe works as a deliberate leak path: rather than letting charge build and release in one sudden spark, it bleeds continuously away to the floor. Inside the A Test, Step by Step The test in ISO 20344 is more demanding than most people expect, mainly because of the conditioning. A shoe does not simply get measured once on a bench. 7 daysConditioning in each atmosphere 4 kgSteel balls loaded into the shoe 100 VDC test voltage applied 1 minHow long the voltage is held Condition in dry air. The footwear spends seven days at 20°C and around 30 per cent relative humidity. This is the harsh case, because dry air is where static builds most readily and where materials tend to read as more insulating. Load the shoe. Four kilograms of steel balls go inside the shoe, sitting on a copper base plate, with a copper connection plate pressed down into the balls. The balls stand in for the foot, giving consistent, repeatable contact with the whole inner surface. Apply the voltage. 100 volts DC is applied for one minute and the resistance between the inside of the shoe and the plate beneath it is measured. Condition in damp air. The sample is then conditioned again, seven days at 20°C and around 85 per cent relative humidity, and measured a second time. Pass both, or fail. The resistance must land above 0.1 MΩ and at or below 1,000 MΩ in dry and damp conditions. A shoe that passes dry but drops out of range when humid does not earn the A. Why the double conditioning matters Humidity changes how materials conduct. Many everyday materials become noticeably more conductive when damp and more insulating when dry. Requiring the shoe to stay inside one window across both extremes is what makes the A rating meaningful rather than a lucky reading on a good day. Why Both Ends of the Window Matter A single upper limit would be simpler. The standard sets a floor as well, and the reason is worth understanding because it explains why "more conductive" is not "better". The three electrical bands of work footwear Resistance measured between the inside of the shoe and the surface beneath it. Conductive Resistance0.1 MΩ or belowMarked C Charge drainsVery quickly The trade-offLess resistance between you and any live circuit Specialist use only Antistatic ResistanceAbove 0.1 MΩ to 1,000 MΩMarked A Charge drainsSteadily and controllably The trade-offA deliberate compromise between both risks The everyday choice Insulating ResistanceAbove 1,000 MΩNot A Charge drainsPoorly, so it stays on you The trade-offHigher risk of a sudden spark discharge Fails the A requirement So the floor at 0.1 MΩ exists to keep some resistance between your foot and the ground, and the ceiling at 1,000 MΩ exists to stop charge accumulating on you. Antistatic sits deliberately in the middle. It is not a weaker version of conductive footwear, it is a different answer to a two-sided problem. Conductive, Antistatic and Insulating Are Three Different Ratings These three get used loosely in conversation and they are not interchangeable. Electrically insulating footwear in particular is a separate product category with its own standard and its own withstand-voltage testing, and it is not something an S1P shoe quietly provides. Property Conductive (C) Antistatic (A) Electrically insulating Purpose Drain charge as fast as possible Drain charge at a controlled rate Isolate the wearer from electrical potential Resistance 0.1 MΩ or below Above 0.1 MΩ to 1,000 MΩ Tested by withstand voltage, not this scale Included in S1P No Yes No Typical use Tightly controlled environments where any retained charge is unacceptable General industry, warehousing, workshops, light trade Specified electrical work under its own rules Suitable for live working No No Only within its own certified scope What the A Rating Does Not Do This is the section that matters most, and the one most product pages skip. The A rating has hard limits, and the standard's own user information states them plainly. It is not electric shock protection. Antistatic footwear is not suitable for work on live electrical installations. It introduces resistance between the foot and the ground, and the accompanying user information is explicit that this cannot guarantee adequate protection against electric shock. It is not ESD certification. ESD footwear sits in a much narrower band under a different standard, and an A-rated shoe will not satisfy an ESD-protected area. We went through the gap in detail in ESD vs antistatic shoes, including why every ESD shoe is antistatic but the reverse is never true. It is not a complete answer to static on its own. The shoe is one part of a path that runs from your skin, through your sock, through the shoe, to the floor. Break any link and the path fails. It is not permanent. The standard's user information warns that the electrical resistance of antistatic footwear can be changed significantly by bending, contamination or moisture, and that the footwear might not perform its intended function when worn in wet conditions. A detail buried in the user information Class I footwear, made from leather and other materials rather than an all-rubber or all-polymeric construction, can absorb moisture over a long shift and become progressively more conductive. Where prolonged wet exposure is likely, the standard points towards Class II all-rubber or all-polymeric footwear instead. Where Antistatic Footwear Is Genuinely Required Because A comes bundled with S1 and above, most workers have it without ever asking for it. There is a smaller group for whom it is not incidental but specified, and for them the marking is a compliance item rather than a nice extra. Flammable and explosive atmospheres. Fuel handling, solvent work, paint spraying, and anywhere covered by dangerous substances regulations. Here the discharge is an ignition source, and footwear forms part of a wider static control approach alongside earth bonding and suitable clothing. Fine powder and dust environments. Flour milling, sugar, certain plastics and pharmaceutical powders can form an ignitable dust cloud, and static is a recognised ignition source in those settings. Electronics and precision assembly. Antistatic is the entry level here. Where components are genuinely sensitive, the site will specify ESD instead, which is stricter. Sites with a documented static control policy. Some warehouses, data centres and healthcare settings simply require it in writing, and that written requirement outranks every opinion, including ours. The decision never belongs to the product page. Your employer's risk assessment and PPE policy determine what you need, and our guide to the UK PPE at Work Regulations covers where that duty actually sits and who carries it. What Quietly Kills Antistatic Performance A shoe that passed in a laboratory can stop performing in a workplace without anyone noticing, because nothing visible changes. These are the common causes. Replacement insoles. The charge path runs up through the footbed. A thick aftermarket insole from a sports shop can interrupt it entirely, and the shoe will look completely normal while doing so. Insulating socks. Heavy synthetic or thickly cushioned socks sit directly in the path between skin and shoe. Thin natural-fibre socks generally interfere less. Contamination on the outsole. Dried paint, adhesive, plaster, oil or a compacted layer of dust forms an insulating film across the contact surface. Moisture and prolonged damp. Water shifts readings in both directions, and the standard flags wet conditions specifically as a scenario where performance may not hold. Insulating floor coverings. A rubber mat, a thick epoxy coating or carpet breaks the final link to earth. Antistatic footwear on an insulating floor has nowhere to send the charge. Ordinary wear and flexing. Repeated bending changes the material over time, which is precisely why the standard recommends periodic retesting rather than trusting the original certificate indefinitely. How to Check Yours Is Still Working The standard does not treat the A rating as a one-off certificate. Its user information recommends that the employer establish an in-house test for electrical resistance, carried out at regular and frequent intervals. In practice that ranges from a footwear tester at the entrance, common on electronics and static-controlled sites, to a periodic check with a suitable resistance meter as part of PPE inspection. If your workplace depends on antistatic footwear and nobody is measuring anything, the paperwork says compliant while the reality is unverified. For a broader view of what the class code promises and what it does not, what S1P certification actually covers is the companion piece to this one. A Sensible Routine Keep the original insole in the shoe unless the manufacturer offers a replacement that maintains the rating. Clean the outsole when it picks up paint, adhesive or heavy dust, rather than letting it build. Treat a soaked pair as untrusted until dry, in any setting where static control genuinely matters. Retest after any significant contamination event, not just on a calendar schedule. Replace rather than nurse a pair with a worn, cracked or heavily contaminated outsole. The Limits of the 'A' Rating The A rating is a narrow, well-defined electrical property, and its value lies in how specific it is. It means a laboratory measured your footwear at 100 volts after a fortnight of conditioning across two humidity extremes, and found it sat inside a band chosen to balance two competing risks. That is a genuinely useful thing to know. What it is not is protection from electric shock, a substitute for ESD certification, or a property that survives a thick aftermarket insole and a floor mat. Most workers already have it, because S1 and above include it as standard. The ones who depend on it are better served by understanding the whole path from skin to floor than by trusting the letter on the label and stopping there. For the record on ours: the Xnexz PulseX and StrideX are certified EN ISO 20345 S1P, so antistatic performance is part of that certification, and they are designed to help disperse static build-up in suitable everyday work settings. They are not ESD-tested, and if your site runs an ESD-protected area you need a current ESD-certified product instead. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your site specifies ESD, conductive footwear or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does the A rating mean on safety shoes? A means antistatic. The footwear has been measured and found to have an electrical resistance above 0.1 MΩ and no greater than 1,000 MΩ, so it drains static charge from the wearer to the floor at a controlled rate rather than letting it build up and discharge as a spark. Are all S1P safety shoes antistatic? Yes. Antistatic performance is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classes. SB is the exception, since a pure SB shoe covers only the toe cap and basic requirements unless it is separately marked A. Does antistatic footwear protect against electric shock? No. Antistatic footwear is not suitable for work on live electrical installations. It adds resistance between the foot and the ground, which is not the same as electrical insulation, and the user information supplied with it states that it cannot guarantee adequate protection against electric shock. How is antistatic footwear tested? The shoe is conditioned for seven days in dry air at around 30 per cent humidity, then loaded with 4 kg of steel balls on a copper plate, and 100 volts DC is applied for one minute while resistance is measured. It is then conditioned for another seven days in damp air at around 85 per cent humidity and measured again. It must sit within the permitted band in both conditions. What is the difference between antistatic and conductive footwear? Conductive footwear, marked C, measures 0.1 MΩ or below and drains charge as quickly as possible. Antistatic, marked A, sits above 0.1 MΩ and up to 1,000 MΩ and drains it at a controlled rate. The antistatic floor exists so that some resistance remains between the wearer and the ground. Can I put my own insoles in antistatic shoes? It is best avoided. The static path runs from your foot through the footbed and out through the sole, so a thick aftermarket insole can interrupt it without any visible sign. If you need a different insole, ask the manufacturer whether one is available that maintains the rating. How long does the antistatic property last? There is no fixed lifespan. The standard's user information notes that electrical resistance can change significantly with bending, contamination or moisture, and recommends that employers set up an in-house resistance test carried out at regular and frequent intervals rather than relying on the original certificate. Do antistatic shoes work on any floor? No. The footwear is only one part of the path to earth. A rubber mat, thick coating or carpet can break that path, leaving the charge with nowhere to go regardless of how good the footwear is. Where static control genuinely matters, the flooring is specified alongside the footwear.
Your S1P Shoe May Have Lost FO and Nobody Told You
FO means the outsole resists fuel oil. Not that it grips on an oily floor. Those are two completely different tests measuring two completely different things, and confusing them is the most common mistake in this corner of safety footwear. FO is about whether the sole material survives contact with hydrocarbons without swelling, softening or falling apart. There is also a change most buyers have not caught up with. Under the old 2011 standard, fuel oil resistance was built into every S1, S2 and S3 shoe automatically. Under EN ISO 20345:2022 it is optional. Your next pair may not have it, and unless the marking says FO, you cannot assume it does. What the FO Test Actually Measures The test is refreshingly literal. A sample of the outsole is immersed in a standard test fuel, a hydrocarbon called 2,2,4-trimethylpentane, and left there. Afterwards the sample is measured to see how much it has changed. 22 hTime the sample sits in test fuel 23°CTemperature it is held at 12%Maximum swelling allowed 2022Year FO stopped being standard If the outsole swells by more than 12 per cent in volume, it fails. There is a second stage too. If the sample instead shrinks by more than 1 per cent, or hardens by more than 10 Shore A units, it goes on to a flexing test where a cut in the sole must not grow more than 6 mm across 150,000 flex cycles at minus 5°C. That second stage exists because a sole can fail in two opposite directions: it can go soft and swollen, or it can go hard and brittle. Both end with a sole that no longer does its job. What FO is really protecting Not your foot directly. It is protecting the outsole itself, and by extension the grip pattern, the bond between sole and upper, and the working life of the shoe. A sole that has swollen or crazed cannot grip the way it was tested to grip. Why FO Is Not Slip Resistance This is the confusion worth clearing up properly, because product listings blur it constantly. "Oil resistant" gets used for both, and they are unrelated. Question FO, fuel oil resistance Slip resistance What is tested The outsole material The grip between outsole and floor What it measures Swelling, shrinking, hardening after fuel contact Coefficient of friction on a contaminated surface The contaminant A standard test fuel, a hydrocarbon Soap solution, or glycerol for the SR marking What it protects The shoe The person Status in 2022 Optional, marked FO Now a basic requirement for all safety footwear Can you have one without the other Yes Yes Put simply, an FO outsole can still slide on a wet floor, and a highly slip-resistant outsole can still be ruined by a diesel spill. You may well need both, but you need to ask for both, and the 2022 standard changed the base slip-resistance rules too, which we covered in non-slip safety trainers and whether SRC grip is even real anymore. The 2022 Change Most Buyers Missed Under EN ISO 20345:2011, fuel oil resistance was a basic requirement for safety footwear beyond the bare SB class. Buy an S1P and you got FO whether you needed it or not. The 2022 revision moved it out of the base requirements and into the optional list, on the reasonable grounds that most workers never go near fuel. What an S1P shoe includes, then and now The same S1P code, two different specifications, depending on which version the shoe was certified to. S1P under the 2011 standard Toe protection200J toe capIncluded Perforation resistanceMidsole insertIncluded Antistatic and heel energyA and EIncluded Fuel oil resistanceFOIncluded FO came as standard S1P under the 2022 standard Toe protection200J toe capIncluded Perforation resistanceP, PL or PS insertIncluded Antistatic and heel energyA and EIncluded Fuel oil resistanceOnly if marked FOOptional FO must be marked That is the practical takeaway. Two shoes can both say S1P on the box and differ on fuel oil resistance, purely because of which version of the standard they were certified against. If it matters to your work, the marking is the only thing that settles it. Our breakdown of what changed between EN ISO 20345:2011 and 2022 covers the rest of the revisions in the same detail. Where FO Appears on the Marking Safety footwear markings read as a class code followed by any additional properties, so FO sits after the class rather than inside it. A shoe marked EN ISO 20345:2022 S1P FO SR is an S1P with fuel oil resistance and the extra glycerol slip test. A shoe marked simply S1P has neither. The marking is normally printed or moulded on the tongue label or inside the shaft, and it should match the EU declaration of conformity for that model. If the label is worn away and the paperwork is not to hand, ask the retailer for the declaration rather than guessing. Sellers who cannot produce it for a specific model are telling you something useful. What Happens to an Outsole Without It Fuel does not attack a sole dramatically. It works slowly, and the damage is easy to mistake for ordinary wear. Swelling. The sole absorbs hydrocarbons and expands. Tread blocks lose their crisp edges, which is exactly what the grip pattern relies on. Softening. A softened sole deforms under load instead of biting into the floor, and it wears down noticeably faster. Hardening and cracking. The opposite failure. Some compounds lose plasticisers on contact and go brittle, then crack across flex points. Bond failure. Fuel that reaches the join between sole and upper can attack the adhesive, and a sole that starts peeling at the toe is finished. None of this happens overnight, which is why it goes unnoticed. Workers usually put it down to the shoes wearing out quickly, and buy the same unsuitable thing again. The tell is uneven, premature failure concentrated where the sole meets the ground most often, on a pair that is otherwise barely used. Outsole Materials and Fuel Material choice matters, though it does not decide the question on its own. Compounds vary enormously within each family, and only the certificate tells you how a specific sole performed. Outsole General behaviour with fuel and oil Worth knowing Polyurethane (PU) Commonly formulated to resist fuel oil and frequently certified FO Light and well cushioned, which is why it is standard on indoor safety trainers Rubber Varies widely by compound, from excellent to poor Usually the choice where heat resistance is also needed Nitrile rubber Specifically formulated for hydrocarbon resistance Common in workshop and industrial ranges EVA A cushioning midsole material rather than a contact surface Almost always paired with a rubber or PU tread layer underneath TPU Generally tough and abrasion resistant Often used for outsole inserts and reinforcement If you want the practical differences between the two you will meet most often, what a PU outsole actually is in an S1P shoe goes through the trade-offs in plain terms. FO does not mean chemical resistance The test uses one specific hydrocarbon. It says nothing about solvents, brake cleaner, acids, alkalis, paint strippers or cooking oil. If your work involves chemicals, that is a separate specification and a separate conversation with your safety officer. Who Actually Needs FO Fewer people than the 2011 standard implied, which is precisely why it was made optional. The honest split looks like this. FO is genuinely worth having FO changes little day to day Vehicle mechanics and garage technicians Warehouse picking and packing Fuel forecourts and tanker work Retail stockrooms Plant, machinery and engine workshops Hospitality and kitchen work Depots and transport yards Healthcare and care settings Agricultural and groundcare machinery work Offices, reception and security Manufacturing lines using cutting or machine oils Interior fit-out and decorating Kitchen work sits in the right-hand column for a reason that surprises people. Cooking oil is not the hydrocarbon the FO test uses, so FO is not the marking that helps there. What a kitchen worker needs is grip on a contaminated floor, which is the slip-resistance side of the equation, not the fuel side. For the left-hand column, the footwear conversation usually starts before FO does. Safety shoes for mechanics and light trade workers covers what else matters in those roles, because fuel resistance is rarely the only consideration in a workshop. Four Questions Before You Buy Does the marking actually say FO? Check the shoe's own label and the certificate, not the product description. Since 2022 the class code alone does not tell you. Which version was it certified to? A shoe certified under the 2011 standard will have FO built in. One certified to 2022 only has it if marked. Is fuel your real problem, or is it grip? If the hazard is a slippery floor rather than fuel contact, slip resistance is the marking to chase. Does your PPE policy specify it? As always, the employer's risk assessment outranks any product page, including this one. The Honest Verdict FO is a narrow, well-defined property that matters enormously to a specific group of workers and barely at all to everyone else. It protects the sole rather than the person, which is why it quietly extends the life of footwear in fuel-contaminated environments instead of showing up as a dramatic safety feature. The thing to take away is the 2022 change. For a decade, buyers could assume fuel oil resistance came free with any S1P shoe. That assumption is now wrong, and it will keep being wrong more often as older stock cycles out. If you work around fuel, stop assuming and start reading the marking. On our own shelf: the Xnexz PulseX and StrideX use an oil-resistant outsole, and by the logic of this article you should not take that phrase on trust from us any more than from anyone else. Ask us for the marking and the certificate before you buy, and hold every brand to the same test. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your role needs FO, a higher rating or specialist protection, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does FO mean on safety shoes? FO means the outsole has passed the fuel oil resistance test in EN ISO 20345. A sample is immersed in a standard hydrocarbon test fuel for 22 hours at 23°C and must not swell by more than 12 per cent in volume. It describes the sole material's durability, not its grip. Is FO the same as oil resistant grip? No. FO tests whether the outsole material survives fuel contact without swelling, shrinking or hardening. Grip on a contaminated floor is measured separately by the slip resistance tests. A shoe can have one without the other. Do all S1P safety shoes have FO? Not any more. Under EN ISO 20345:2011 fuel oil resistance was a basic requirement, so S1P shoes included it. Under the 2022 version it is an optional additional requirement, so a shoe only has it if the marking says FO. Does FO protect against chemicals or cooking oil? No. The test uses one specific hydrocarbon fuel. It says nothing about solvents, acids, alkalis, brake cleaner or cooking oil. Chemical exposure needs its own specification and its own risk assessment. What happens to a sole without FO if it meets fuel? It can swell and lose the sharp edges of its tread, soften and wear faster, or harden and crack at flex points. Fuel can also attack the adhesive bonding the sole to the upper. The damage is gradual and often mistaken for ordinary wear. Which outsole materials resist fuel oil best? Nitrile rubber is specifically formulated for hydrocarbon resistance, and polyurethane is commonly certified FO. Rubber varies widely by compound. Since formulations differ between models, the certificate for that specific shoe is the only reliable answer.
Your S1P Shoe May Have Lost FO and Nobody Told You
FO means the outsole resists fuel oil. Not that it grips on an oily floor. Those are two completely different tests measuring two completely different things, and confusing them is the most common mistake in this corner of safety footwear. FO is about whether the sole material survives contact with hydrocarbons without swelling, softening or falling apart. There is also a change most buyers have not caught up with. Under the old 2011 standard, fuel oil resistance was built into every S1, S2 and S3 shoe automatically. Under EN ISO 20345:2022 it is optional. Your next pair may not have it, and unless the marking says FO, you cannot assume it does. What the FO Test Actually Measures The test is refreshingly literal. A sample of the outsole is immersed in a standard test fuel, a hydrocarbon called 2,2,4-trimethylpentane, and left there. Afterwards the sample is measured to see how much it has changed. 22 hTime the sample sits in test fuel 23°CTemperature it is held at 12%Maximum swelling allowed 2022Year FO stopped being standard If the outsole swells by more than 12 per cent in volume, it fails. There is a second stage too. If the sample instead shrinks by more than 1 per cent, or hardens by more than 10 Shore A units, it goes on to a flexing test where a cut in the sole must not grow more than 6 mm across 150,000 flex cycles at minus 5°C. That second stage exists because a sole can fail in two opposite directions: it can go soft and swollen, or it can go hard and brittle. Both end with a sole that no longer does its job. What FO is really protecting Not your foot directly. It is protecting the outsole itself, and by extension the grip pattern, the bond between sole and upper, and the working life of the shoe. A sole that has swollen or crazed cannot grip the way it was tested to grip. Why FO Is Not Slip Resistance This is the confusion worth clearing up properly, because product listings blur it constantly. "Oil resistant" gets used for both, and they are unrelated. Question FO, fuel oil resistance Slip resistance What is tested The outsole material The grip between outsole and floor What it measures Swelling, shrinking, hardening after fuel contact Coefficient of friction on a contaminated surface The contaminant A standard test fuel, a hydrocarbon Soap solution, or glycerol for the SR marking What it protects The shoe The person Status in 2022 Optional, marked FO Now a basic requirement for all safety footwear Can you have one without the other Yes Yes Put simply, an FO outsole can still slide on a wet floor, and a highly slip-resistant outsole can still be ruined by a diesel spill. You may well need both, but you need to ask for both, and the 2022 standard changed the base slip-resistance rules too, which we covered in non-slip safety trainers and whether SRC grip is even real anymore. The 2022 Change Most Buyers Missed Under EN ISO 20345:2011, fuel oil resistance was a basic requirement for safety footwear beyond the bare SB class. Buy an S1P and you got FO whether you needed it or not. The 2022 revision moved it out of the base requirements and into the optional list, on the reasonable grounds that most workers never go near fuel. What an S1P shoe includes, then and now The same S1P code, two different specifications, depending on which version the shoe was certified to. S1P under the 2011 standard Toe protection200J toe capIncluded Perforation resistanceMidsole insertIncluded Antistatic and heel energyA and EIncluded Fuel oil resistanceFOIncluded FO came as standard S1P under the 2022 standard Toe protection200J toe capIncluded Perforation resistanceP, PL or PS insertIncluded Antistatic and heel energyA and EIncluded Fuel oil resistanceOnly if marked FOOptional FO must be marked That is the practical takeaway. Two shoes can both say S1P on the box and differ on fuel oil resistance, purely because of which version of the standard they were certified against. If it matters to your work, the marking is the only thing that settles it. Our breakdown of what changed between EN ISO 20345:2011 and 2022 covers the rest of the revisions in the same detail. Where FO Appears on the Marking Safety footwear markings read as a class code followed by any additional properties, so FO sits after the class rather than inside it. A shoe marked EN ISO 20345:2022 S1P FO SR is an S1P with fuel oil resistance and the extra glycerol slip test. A shoe marked simply S1P has neither. The marking is normally printed or moulded on the tongue label or inside the shaft, and it should match the EU declaration of conformity for that model. If the label is worn away and the paperwork is not to hand, ask the retailer for the declaration rather than guessing. Sellers who cannot produce it for a specific model are telling you something useful. What Happens to an Outsole Without It Fuel does not attack a sole dramatically. It works slowly, and the damage is easy to mistake for ordinary wear. Swelling. The sole absorbs hydrocarbons and expands. Tread blocks lose their crisp edges, which is exactly what the grip pattern relies on. Softening. A softened sole deforms under load instead of biting into the floor, and it wears down noticeably faster. Hardening and cracking. The opposite failure. Some compounds lose plasticisers on contact and go brittle, then crack across flex points. Bond failure. Fuel that reaches the join between sole and upper can attack the adhesive, and a sole that starts peeling at the toe is finished. None of this happens overnight, which is why it goes unnoticed. Workers usually put it down to the shoes wearing out quickly, and buy the same unsuitable thing again. The tell is uneven, premature failure concentrated where the sole meets the ground most often, on a pair that is otherwise barely used. Outsole Materials and Fuel Material choice matters, though it does not decide the question on its own. Compounds vary enormously within each family, and only the certificate tells you how a specific sole performed. Outsole General behaviour with fuel and oil Worth knowing Polyurethane (PU) Commonly formulated to resist fuel oil and frequently certified FO Light and well cushioned, which is why it is standard on indoor safety trainers Rubber Varies widely by compound, from excellent to poor Usually the choice where heat resistance is also needed Nitrile rubber Specifically formulated for hydrocarbon resistance Common in workshop and industrial ranges EVA A cushioning midsole material rather than a contact surface Almost always paired with a rubber or PU tread layer underneath TPU Generally tough and abrasion resistant Often used for outsole inserts and reinforcement If you want the practical differences between the two you will meet most often, what a PU outsole actually is in an S1P shoe goes through the trade-offs in plain terms. FO does not mean chemical resistance The test uses one specific hydrocarbon. It says nothing about solvents, brake cleaner, acids, alkalis, paint strippers or cooking oil. If your work involves chemicals, that is a separate specification and a separate conversation with your safety officer. Who Actually Needs FO Fewer people than the 2011 standard implied, which is precisely why it was made optional. The honest split looks like this. FO is genuinely worth having FO changes little day to day Vehicle mechanics and garage technicians Warehouse picking and packing Fuel forecourts and tanker work Retail stockrooms Plant, machinery and engine workshops Hospitality and kitchen work Depots and transport yards Healthcare and care settings Agricultural and groundcare machinery work Offices, reception and security Manufacturing lines using cutting or machine oils Interior fit-out and decorating Kitchen work sits in the right-hand column for a reason that surprises people. Cooking oil is not the hydrocarbon the FO test uses, so FO is not the marking that helps there. What a kitchen worker needs is grip on a contaminated floor, which is the slip-resistance side of the equation, not the fuel side. For the left-hand column, the footwear conversation usually starts before FO does. Safety shoes for mechanics and light trade workers covers what else matters in those roles, because fuel resistance is rarely the only consideration in a workshop. Four Questions Before You Buy Does the marking actually say FO? Check the shoe's own label and the certificate, not the product description. Since 2022 the class code alone does not tell you. Which version was it certified to? A shoe certified under the 2011 standard will have FO built in. One certified to 2022 only has it if marked. Is fuel your real problem, or is it grip? If the hazard is a slippery floor rather than fuel contact, slip resistance is the marking to chase. Does your PPE policy specify it? As always, the employer's risk assessment outranks any product page, including this one. The Honest Verdict FO is a narrow, well-defined property that matters enormously to a specific group of workers and barely at all to everyone else. It protects the sole rather than the person, which is why it quietly extends the life of footwear in fuel-contaminated environments instead of showing up as a dramatic safety feature. The thing to take away is the 2022 change. For a decade, buyers could assume fuel oil resistance came free with any S1P shoe. That assumption is now wrong, and it will keep being wrong more often as older stock cycles out. If you work around fuel, stop assuming and start reading the marking. On our own shelf: the Xnexz PulseX and StrideX use an oil-resistant outsole, and by the logic of this article you should not take that phrase on trust from us any more than from anyone else. Ask us for the marking and the certificate before you buy, and hold every brand to the same test. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your role needs FO, a higher rating or specialist protection, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions What does FO mean on safety shoes? FO means the outsole has passed the fuel oil resistance test in EN ISO 20345. A sample is immersed in a standard hydrocarbon test fuel for 22 hours at 23°C and must not swell by more than 12 per cent in volume. It describes the sole material's durability, not its grip. Is FO the same as oil resistant grip? No. FO tests whether the outsole material survives fuel contact without swelling, shrinking or hardening. Grip on a contaminated floor is measured separately by the slip resistance tests. A shoe can have one without the other. Do all S1P safety shoes have FO? Not any more. Under EN ISO 20345:2011 fuel oil resistance was a basic requirement, so S1P shoes included it. Under the 2022 version it is an optional additional requirement, so a shoe only has it if the marking says FO. Does FO protect against chemicals or cooking oil? No. The test uses one specific hydrocarbon fuel. It says nothing about solvents, acids, alkalis, brake cleaner or cooking oil. Chemical exposure needs its own specification and its own risk assessment. What happens to a sole without FO if it meets fuel? It can swell and lose the sharp edges of its tread, soften and wear faster, or harden and crack at flex points. Fuel can also attack the adhesive bonding the sole to the upper. The damage is gradual and often mistaken for ordinary wear. Which outsole materials resist fuel oil best? Nitrile rubber is specifically formulated for hydrocarbon resistance, and polyurethane is commonly certified FO. Rubber varies widely by compound. Since formulations differ between models, the certificate for that specific shoe is the only reliable answer.
Metal Free Safety Shoes: Most Workers Do Not Need Them
Metal free safety shoes get sold as an upgrade. They are not one. A metal free shoe protects your toes to exactly the same certified level as a steel toe shoe, because EN ISO 20345 requires every safety toe cap to withstand a 200 joule impact whatever it is made from. What changes is not the protection. It is what the shoe is made of, and whether that matters where you work. For a minority of workers it matters a great deal, and buying steel would make their working day harder or get them stopped at a door. For most workers it makes no practical difference at all. This guide separates the two groups honestly, so you are not paying extra for a feature your job will never use. What "Metal Free" Actually Means This is the first place buyers get caught out. Metal free is not a toe cap description. It is a description of the whole shoe, and it takes two components to qualify, sometimes three. A composite toe cap instead of steel or aluminium. Composite caps are built from non-metal materials such as fibreglass, carbon fibre, aramid or hard engineered plastics. A non-metallic perforation-resistant midsole instead of a steel plate. These use woven textile layers, aramid or similar fabrics rather than metal. Non-metallic eyelets and hardware on a genuinely complete build, because a metal eyelet is still metal to a detector. A shoe with a composite toe cap and a steel midsole is not metal free. It is a composite-toe shoe with a metal plate in it, and it will behave like a metal shoe in a security lane. That combination is common and it is not a scam, but if you bought it specifically to walk through a detector, it will not do the job. The Three Builds You Will Actually See on Shelves Almost every safety shoe on the UK market is one of three constructions. Knowing which one you are holding takes about ten seconds once you know what to look at. The three common safety shoe constructions All three can carry the same certified 200J toe protection. What differs is the material. Traditional build Toe capSteelMetal Perforation midsoleSteel plateMetal EyeletsUsually metalMetal Not metal free Hybrid build Toe capAluminium or alloyMetal Perforation midsoleAramid or textileNon-metal EyeletsUsually metalMetal Not metal free Metal free build Toe capCompositeNon-metal Perforation midsoleNon-metallic insertNon-metal EyeletsNon-metallicNon-metal Metal free The middle column is where most confusion lives. A hybrid shoe with an aluminium toe and an aramid midsole is lighter than an all-steel shoe and often more comfortable, but aluminium is a metal. It is not metal free, and honest sellers should not describe it that way. Toe Cap Materials Compared The three toe cap materials trade against each other rather than ranking cleanly. For a deeper look at the trade-offs, see aluminium, composite and steel toe caps compared. Property Steel Aluminium or alloy Composite Material Carbon steel Aluminium, sometimes titanium Fibreglass, carbon fibre, aramid or engineered plastic Counts as metal free No No Yes Relative weight Heaviest of the three Lighter than steel, the lightest metal option Lighter than steel Passes a metal detector No No Yes, if the rest of the shoe is also non-metallic Conducts heat and cold Yes, most of the three Yes, less than steel No Bulk at the toe Thinnest profile Thin, often roomier inside than steel Usually the bulkiest Certified impact level 200J 200J 200J The line worth underlining A composite toe cap is non-conductive, but that does not make the shoe electrical protection. Footwear for electrical risk needs its own specific certification and its own risk assessment. Never treat "no metal in the toe" as a substitute for that. How the 2022 Standard Changed the Midsole Code If you are buying metal free, the midsole marking is the part to read, because EN ISO 20345:2022 made it much more precise. Under the current standard the perforation marking tells you the material and the test. PMetal insert, usually a steel plate PLNon-metallic insert, 4.5 mm nail PSNon-metallic insert, 3.0 mm nail 200JToe impact level for all of them A finer nail concentrates the same force into a smaller point, so the 3.0 mm test is the harder one to pass. That makes PS the higher perforation grade of the two non-metallic options. A shoe can only carry one of these markings, never two, so P, PL and PS are mutually exclusive on any given model. This matters commercially. A shoe still marked plain S1P has a metal insert under the current standard. If a listing says metal free but the code reads S1P rather than S1PL or S1PS, something does not add up and it is worth asking the seller before you buy. Our explainer on what S1PL means, and how PL differs from PS goes through the codes one by one, and Kevlar and steel midsoles compared covers how the two materials behave underfoot. Who Actually Needs Metal Free Footwear Here is the honest list. These are the situations where metal free is a real requirement or a real daily advantage, rather than a nice line on a product page. You pass through security screening regularly. Airports, courts, prisons, rail hubs, secure data centres, some government and defence sites. If you are removing your boots several times a shift, metal free ends that. Your site runs metal detection on the production line. Food production and packing, and some pharmaceutical work, screen for metal contamination. Sites like these often specify non-metallic footwear as policy, not preference. You work near imaging or magnetic equipment. MRI suites and similar environments have strict rules on ferrous items, and porters, cleaners and maintenance staff working around them are usually covered by those rules too. You work in real cold or real heat. Metal conducts temperature toward your foot. In cold storage and freezer work, or in hot environments, a composite cap does not carry that swing the way steel does. Your employer's PPE policy says so in writing. The simplest reason of all, and the one that overrides every opinion in this article, including ours. Who Does Not Need It Most workers, honestly. If your day never involves a detector, a metal-screened production line, imaging equipment or extreme temperatures, metal free buys you nothing your job will notice. You are paying for compatibility you will never use. Metal free is worth paying for Metal free changes little Airport, court, prison and rail staff General warehouse picking and packing Food production and packing lines with metal detection Delivery, depot and courier work Cleanroom and pharmaceutical production Retail stockrooms and hospitality Cold storage, chillers and freezer work Facilities and light maintenance indoors Work near MRI or magnetic-sensitive equipment Garages and light trade work Any site whose PPE policy specifies non-metallic Interior fit-out, painting and decorating One caveat on that right-hand column. A job title is never proof on its own, because two warehouses doing identical work can have completely different rules. Check your own site's policy rather than assuming the category applies to you. The Trade-Offs Nobody Mentions Metal free is a genuine solution to a genuine problem, but it is not free of compromise. An honest seller tells you both halves. Composite caps are usually bulkier. Non-metal materials need more thickness to hit the same 200J, so the toe box tends to look and feel chunkier than a slim steel or aluminium cap. Some people prefer the extra room, others do not like the profile. Fit can change. A different cap shape can change how the front of the shoe sits on your foot, so treat a switch from steel to composite as a new fitting rather than a like-for-like swap. Lighter is not automatic. Composite is lighter than steel at the cap, but total shoe weight depends on the sole, the upper and the midsole too. Compare the finished shoe, not one component. Metal free says nothing about the rest of the rating. A metal free S1P shoe is still not waterproof, and it is still not suitable for work that requires an S3 or a specialist classification. The material and the rating are separate questions. After a heavy impact Any safety toe cap that has taken a serious hit should be inspected and, if in doubt, replaced, whatever it is made from. Certification describes a tested impact on a new shoe, not an unlimited number of impacts over its life. That applies equally to steel, aluminium and composite. Four Questions That Settle It Does anything at work screen for metal? A detector at the door, an arch, a wand or a line scanner. If yes, metal free is likely worth it. Does your PPE specification use the words non-metallic or metal free? If it does, that is the answer, and no other consideration outranks it. Do you work in sustained cold or heat? Freezer, chiller or hot process work is where the thermal difference stops being theoretical. Would you notice the difference otherwise? If the honest answer is no, buy on fit, comfort and the correct safety rating instead, and put the money there. The Honest Verdict Metal free is a compatibility feature, not a safety upgrade. It solves access, contamination and temperature problems extremely well, and it solves nothing else. The workers who need it usually know exactly why, because a door, a line scanner or a written policy tells them every day. Everyone else is better off spending the same money on the correct rating and a shoe that genuinely fits. If you do need it, buy from a range built for it. Established brands including uvex, Puma Safety, Cofra, Portwest, Solid Gear and Rock Fall run proper non-metallic lines with wide size runs, women's fits, boots with ankle support and waterproof S3 options, and for this requirement they are the right place to look. Where we stand, plainly: the Xnexz PulseX and StrideX use an aluminium toe cap, and aluminium is a metal. They are not metal free, and we will not market them as though they are. If your workplace requires non-metallic footwear, we are not the shoe for you, and we would rather say so here than have you find out at a security door. If Your Site Does Not Require Metal Free Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your PPE policy calls for non-metallic footwear, or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions Are metal free safety shoes as strong as steel toe? For certified toe protection, yes. EN ISO 20345 requires a 200 joule impact resistance for the toe cap regardless of material, so a certified composite cap meets the same tested level as a certified steel one. The materials differ in weight, bulk and how they conduct temperature, not in the certified impact figure. Do composite toe boots set off metal detectors? A composite toe cap itself does not. The rest of the shoe can, though. A steel midsole, a metal shank or metal eyelets will still register, so look for a build described as fully non-metallic rather than just composite toe. Is aluminium toe the same as metal free? No. Aluminium is a metal. An aluminium or alloy toe cap is lighter than steel and often gives more room inside the toe, but it will still show on a detector and it does not qualify as metal free. What is the difference between S1P, S1PL and S1PS? Under EN ISO 20345:2022, P means a metal perforation-resistant insert. PL means a non-metallic insert tested with a 4.5 mm nail, and PS means a non-metallic insert tested with a finer 3.0 mm nail, which is the harder test. A shoe carries only one of the three markings. Are metal free safety shoes lighter? At the toe cap, composite is lighter than steel. Total shoe weight also depends on the outsole, midsole and upper, so compare finished weights of the actual models rather than assuming metal free means lighter overall. Are Xnexz PulseX and StrideX metal free? No. Both use an aluminium toe cap, which is a metal, so they are not metal free and will not pass a metal detector. If your workplace requires non-metallic footwear, choose a shoe with a composite toe cap and a non-metallic perforation-resistant midsole.
Metal Free Safety Shoes: Most Workers Do Not Need Them
Metal free safety shoes get sold as an upgrade. They are not one. A metal free shoe protects your toes to exactly the same certified level as a steel toe shoe, because EN ISO 20345 requires every safety toe cap to withstand a 200 joule impact whatever it is made from. What changes is not the protection. It is what the shoe is made of, and whether that matters where you work. For a minority of workers it matters a great deal, and buying steel would make their working day harder or get them stopped at a door. For most workers it makes no practical difference at all. This guide separates the two groups honestly, so you are not paying extra for a feature your job will never use. What "Metal Free" Actually Means This is the first place buyers get caught out. Metal free is not a toe cap description. It is a description of the whole shoe, and it takes two components to qualify, sometimes three. A composite toe cap instead of steel or aluminium. Composite caps are built from non-metal materials such as fibreglass, carbon fibre, aramid or hard engineered plastics. A non-metallic perforation-resistant midsole instead of a steel plate. These use woven textile layers, aramid or similar fabrics rather than metal. Non-metallic eyelets and hardware on a genuinely complete build, because a metal eyelet is still metal to a detector. A shoe with a composite toe cap and a steel midsole is not metal free. It is a composite-toe shoe with a metal plate in it, and it will behave like a metal shoe in a security lane. That combination is common and it is not a scam, but if you bought it specifically to walk through a detector, it will not do the job. The Three Builds You Will Actually See on Shelves Almost every safety shoe on the UK market is one of three constructions. Knowing which one you are holding takes about ten seconds once you know what to look at. The three common safety shoe constructions All three can carry the same certified 200J toe protection. What differs is the material. Traditional build Toe capSteelMetal Perforation midsoleSteel plateMetal EyeletsUsually metalMetal Not metal free Hybrid build Toe capAluminium or alloyMetal Perforation midsoleAramid or textileNon-metal EyeletsUsually metalMetal Not metal free Metal free build Toe capCompositeNon-metal Perforation midsoleNon-metallic insertNon-metal EyeletsNon-metallicNon-metal Metal free The middle column is where most confusion lives. A hybrid shoe with an aluminium toe and an aramid midsole is lighter than an all-steel shoe and often more comfortable, but aluminium is a metal. It is not metal free, and honest sellers should not describe it that way. Toe Cap Materials Compared The three toe cap materials trade against each other rather than ranking cleanly. For a deeper look at the trade-offs, see aluminium, composite and steel toe caps compared. Property Steel Aluminium or alloy Composite Material Carbon steel Aluminium, sometimes titanium Fibreglass, carbon fibre, aramid or engineered plastic Counts as metal free No No Yes Relative weight Heaviest of the three Lighter than steel, the lightest metal option Lighter than steel Passes a metal detector No No Yes, if the rest of the shoe is also non-metallic Conducts heat and cold Yes, most of the three Yes, less than steel No Bulk at the toe Thinnest profile Thin, often roomier inside than steel Usually the bulkiest Certified impact level 200J 200J 200J The line worth underlining A composite toe cap is non-conductive, but that does not make the shoe electrical protection. Footwear for electrical risk needs its own specific certification and its own risk assessment. Never treat "no metal in the toe" as a substitute for that. How the 2022 Standard Changed the Midsole Code If you are buying metal free, the midsole marking is the part to read, because EN ISO 20345:2022 made it much more precise. Under the current standard the perforation marking tells you the material and the test. PMetal insert, usually a steel plate PLNon-metallic insert, 4.5 mm nail PSNon-metallic insert, 3.0 mm nail 200JToe impact level for all of them A finer nail concentrates the same force into a smaller point, so the 3.0 mm test is the harder one to pass. That makes PS the higher perforation grade of the two non-metallic options. A shoe can only carry one of these markings, never two, so P, PL and PS are mutually exclusive on any given model. This matters commercially. A shoe still marked plain S1P has a metal insert under the current standard. If a listing says metal free but the code reads S1P rather than S1PL or S1PS, something does not add up and it is worth asking the seller before you buy. Our explainer on what S1PL means, and how PL differs from PS goes through the codes one by one, and Kevlar and steel midsoles compared covers how the two materials behave underfoot. Who Actually Needs Metal Free Footwear Here is the honest list. These are the situations where metal free is a real requirement or a real daily advantage, rather than a nice line on a product page. You pass through security screening regularly. Airports, courts, prisons, rail hubs, secure data centres, some government and defence sites. If you are removing your boots several times a shift, metal free ends that. Your site runs metal detection on the production line. Food production and packing, and some pharmaceutical work, screen for metal contamination. Sites like these often specify non-metallic footwear as policy, not preference. You work near imaging or magnetic equipment. MRI suites and similar environments have strict rules on ferrous items, and porters, cleaners and maintenance staff working around them are usually covered by those rules too. You work in real cold or real heat. Metal conducts temperature toward your foot. In cold storage and freezer work, or in hot environments, a composite cap does not carry that swing the way steel does. Your employer's PPE policy says so in writing. The simplest reason of all, and the one that overrides every opinion in this article, including ours. Who Does Not Need It Most workers, honestly. If your day never involves a detector, a metal-screened production line, imaging equipment or extreme temperatures, metal free buys you nothing your job will notice. You are paying for compatibility you will never use. Metal free is worth paying for Metal free changes little Airport, court, prison and rail staff General warehouse picking and packing Food production and packing lines with metal detection Delivery, depot and courier work Cleanroom and pharmaceutical production Retail stockrooms and hospitality Cold storage, chillers and freezer work Facilities and light maintenance indoors Work near MRI or magnetic-sensitive equipment Garages and light trade work Any site whose PPE policy specifies non-metallic Interior fit-out, painting and decorating One caveat on that right-hand column. A job title is never proof on its own, because two warehouses doing identical work can have completely different rules. Check your own site's policy rather than assuming the category applies to you. The Trade-Offs Nobody Mentions Metal free is a genuine solution to a genuine problem, but it is not free of compromise. An honest seller tells you both halves. Composite caps are usually bulkier. Non-metal materials need more thickness to hit the same 200J, so the toe box tends to look and feel chunkier than a slim steel or aluminium cap. Some people prefer the extra room, others do not like the profile. Fit can change. A different cap shape can change how the front of the shoe sits on your foot, so treat a switch from steel to composite as a new fitting rather than a like-for-like swap. Lighter is not automatic. Composite is lighter than steel at the cap, but total shoe weight depends on the sole, the upper and the midsole too. Compare the finished shoe, not one component. Metal free says nothing about the rest of the rating. A metal free S1P shoe is still not waterproof, and it is still not suitable for work that requires an S3 or a specialist classification. The material and the rating are separate questions. After a heavy impact Any safety toe cap that has taken a serious hit should be inspected and, if in doubt, replaced, whatever it is made from. Certification describes a tested impact on a new shoe, not an unlimited number of impacts over its life. That applies equally to steel, aluminium and composite. Four Questions That Settle It Does anything at work screen for metal? A detector at the door, an arch, a wand or a line scanner. If yes, metal free is likely worth it. Does your PPE specification use the words non-metallic or metal free? If it does, that is the answer, and no other consideration outranks it. Do you work in sustained cold or heat? Freezer, chiller or hot process work is where the thermal difference stops being theoretical. Would you notice the difference otherwise? If the honest answer is no, buy on fit, comfort and the correct safety rating instead, and put the money there. The Honest Verdict Metal free is a compatibility feature, not a safety upgrade. It solves access, contamination and temperature problems extremely well, and it solves nothing else. The workers who need it usually know exactly why, because a door, a line scanner or a written policy tells them every day. Everyone else is better off spending the same money on the correct rating and a shoe that genuinely fits. If you do need it, buy from a range built for it. Established brands including uvex, Puma Safety, Cofra, Portwest, Solid Gear and Rock Fall run proper non-metallic lines with wide size runs, women's fits, boots with ankle support and waterproof S3 options, and for this requirement they are the right place to look. Where we stand, plainly: the Xnexz PulseX and StrideX use an aluminium toe cap, and aluminium is a metal. They are not metal free, and we will not market them as though they are. If your workplace requires non-metallic footwear, we are not the shoe for you, and we would rather say so here than have you find out at a security door. If Your Site Does Not Require Metal Free Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your PPE policy calls for non-metallic footwear, or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions Are metal free safety shoes as strong as steel toe? For certified toe protection, yes. EN ISO 20345 requires a 200 joule impact resistance for the toe cap regardless of material, so a certified composite cap meets the same tested level as a certified steel one. The materials differ in weight, bulk and how they conduct temperature, not in the certified impact figure. Do composite toe boots set off metal detectors? A composite toe cap itself does not. The rest of the shoe can, though. A steel midsole, a metal shank or metal eyelets will still register, so look for a build described as fully non-metallic rather than just composite toe. Is aluminium toe the same as metal free? No. Aluminium is a metal. An aluminium or alloy toe cap is lighter than steel and often gives more room inside the toe, but it will still show on a detector and it does not qualify as metal free. What is the difference between S1P, S1PL and S1PS? Under EN ISO 20345:2022, P means a metal perforation-resistant insert. PL means a non-metallic insert tested with a 4.5 mm nail, and PS means a non-metallic insert tested with a finer 3.0 mm nail, which is the harder test. A shoe carries only one of the three markings. Are metal free safety shoes lighter? At the toe cap, composite is lighter than steel. Total shoe weight also depends on the outsole, midsole and upper, so compare finished weights of the actual models rather than assuming metal free means lighter overall. Are Xnexz PulseX and StrideX metal free? No. Both use an aluminium toe cap, which is a metal, so they are not metal free and will not pass a metal detector. If your workplace requires non-metallic footwear, choose a shoe with a composite toe cap and a non-metallic perforation-resistant midsole.
ESD vs Antistatic Shoes: The 900 MΩ Gap Nobody Mentions
ESD and antistatic sound like the same feature, and plenty of product listings treat them as if they are. They are not. Antistatic footwear certified under EN ISO 20345 must measure between 0.1 MΩ and 1,000 MΩ. ESD footwear tested to EN IEC 61340 must sit in a much narrower window, roughly 0.1 MΩ to 100 MΩ, with many suppliers testing to a stricter 35 MΩ ceiling. That gap matters. Every ESD-certified shoe is also antistatic, but an antistatic shoe is not automatically ESD, so if your site runs an ESD-protected area, antistatic alone will not satisfy the audit. Here is where the line sits, and how to work out which side of it your job is on. What "Antistatic" Actually Means on a Safety Shoe Antistatic is not an optional extra bolted onto safety footwear. It is baked into the rating system. If a shoe carries an S1, S1P, S2, S3, S6 or S7 marking under EN ISO 20345, antistatic performance is already part of that classification. There is no separate "antistatic version" to hunt for. For the full breakdown of the code, see what S1P certification actually covers. The job is narrow and specific: stop charge building up on the wearer, and let whatever does build up drain to the floor at a controlled rate. The permitted window is wide, 0.1 MΩ at the bottom to 1,000 MΩ at the top, and that width is deliberate. The lower limit protects you. If resistance drops too low the footwear starts behaving like a conductor, raising the risk if you contact a live circuit. The upper limit guards against sparks. Above 1,000 MΩ, charge stays on your body instead of draining, and a discharge becomes more likely in dusty or flammable-atmosphere settings. Everything between is a compromise. Antistatic footwear is tuned for general workplace safety, not for the tolerances of a bare microchip. What "ESD" Actually Means, and Why It Is Stricter ESD stands for electrostatic discharge. ESD footwear is not really a personal protection product in the way a toe cap is. It is a component in an electrostatic control system, governed by EN IEC 61340-5-1 and tested by the method in EN IEC 61340-4-3. The purpose flips completely. Antistatic footwear is mainly about the person and the environment. ESD footwear is mainly about the product: circuit boards, semiconductors, sensors and medical devices that can be degraded by a discharge far too small for a human to notice. Because what is being protected is so much more delicate, the acceptable range is squeezed. The commonly cited window is 0.1 MΩ to 100 MΩ, and a shoe measuring under 35 MΩ is widely treated as comfortably ESD-capable. Personnel grounding systems under the standard are typically required to come in below 35 MΩ in total, which is what most footwear testers at factory entrances are set to check. 0.1 MΩLower limit shared by both 100 MΩTypical ESD ceiling 1,000 MΩAntistatic ceiling 10xHow much tighter ESD is Seeing the Gap on a Single Scale These numbers are easier to trust side by side. The scale below is logarithmic, so each gridline is ten times more resistance than the one before it. The dark bar is the antistatic window; the gold bar is the ESD window sitting inside it. Permitted resistance windows, plotted on one scale Electrical resistance of the footwear, measured in ohms. Antistatic (EN ISO 20345, built into S1P and above)0.1 MΩ to 1,000 MΩ ESD (EN IEC 61340, tested to 61340-4-3)0.1 MΩ to 100 MΩ 0.01 MΩ 10 MΩ 10,000 MΩ Below 0.1 MΩToo conductive. Fails both, and raises electrical risk to the wearer. 100 MΩ to 1,000 MΩLegally antistatic, but outside the usual ESD window. This band is exactly where the confusion lives. Above 1,000 MΩToo insulating. Charge stays on the wearer instead of draining away. That middle zone is the whole story. A shoe measuring 400 MΩ is a perfectly valid antistatic safety shoe and a perfectly invalid ESD shoe. Nothing has been mislabelled and nobody cut a corner. It simply was not built or tested for the same job. Side by Side Comparison Feature Antistatic (A) ESD Governing standard EN ISO 20345 EN IEC 61340-5-1, tested per EN IEC 61340-4-3 Resistance range 0.1 MΩ to 1,000 MΩ Approximately 0.1 MΩ to 100 MΩ, often verified under 35 MΩ Primary purpose Reduce static build-up on the wearer and lower spark risk Protect static-sensitive components from discharge damage What it mainly protects The person and the surrounding environment The product being handled Included in S1P by default Yes No Needs matching flooring Helpful, not usually mandated Yes, footwear is only one part of the grounding path Routine on-site testing Recommended by the standard's user information Commonly required, often a daily tester at the door Insole changes allowed Avoid anything that alters the resistance path No, aftermarket insoles can invalidate the certification Typical workplaces Warehousing, delivery, facilities, workshops, hospitality, retail stockrooms Electronics assembly, semiconductor work, cleanrooms, explosives and some pharmaceutical or lab areas The one-way rule worth remembering ESD footwear is always antistatic as well, because its range sits inside the antistatic range. The reverse is not true. Buying antistatic when the specification says ESD is a real compliance gap, not a technicality. What Neither Type of Shoe Does This is the part that gets skipped, and it matters more than the resistance figures. Neither antistatic nor ESD footwear is electrical-shock protection, and neither one removes risk entirely. Not for live electrical work. The official user information supplied with antistatic footwear states plainly that it is not suitable for work on live electrical installations. It introduces resistance between foot and ground, which is not insulation and is no substitute for the controls specified for live working. No guarantee against discharge. Even correctly certified ESD footwear cannot guarantee that every discharge is prevented. It is one part of a system that includes flooring, garments, wrist straps, work surfaces and testing. Performance is not permanent. The standard's own guidance is blunt: electrical resistance can change significantly with bending, contamination or moisture. A shoe that passed on day one can drift out of range. Wet conditions are a known weak point. The user information warns that antistatic footwear might not perform its intended function in wet conditions, which is one reason wet outdoor workers are better served by waterproof S3 footwear. Because of that drift The standard recommends that employers set up an in-house electrical resistance test carried out at regular and frequent intervals. If your site relies on antistatic or ESD footwear and nobody is testing it, the paperwork says compliant while the reality may not be. Five Things That Quietly Break Antistatic and ESD Performance Aftermarket insoles. A cushioned insole from a sports shop changes the resistance path through the shoe. On ESD footwear this is one of the fastest ways to void certification. Thick or insulating socks. The path runs from skin through sock and shoe to the floor. Heavily insulating socks sit right in the middle of it. Contamination underfoot. Paint, adhesive, oil, dried plaster or compacted dust on the outsole all interfere with the discharge path. Moisture and prolonged damp. Water changes readings in both directions, and the standard flags wet conditions specifically. Insulating floor coverings. A rubber mat, thick coating or carpeted walkway breaks the grounding path no matter how good the footwear is. ESD control is a footwear and flooring system. So Which One Does Your Job Need? The honest hierarchy: the shoe listing does not decide this. Your employer's risk assessment and PPE policy decide it, and in ESD environments the site's electrostatic control plan decides it. Our guide to the UK PPE at Work Regulations covers where that duty sits. Antistatic S1P is often accepted ESD is usually specified Warehouse picking, packing and forklift work Electronics assembly and PCB handling Delivery and depot work Semiconductor and wafer environments Facilities and light maintenance Cleanrooms with a documented ESD-protected area Garages and light trade work Repair benches for static-sensitive devices Interior fit-out, painting and decorating Explosives, propellants and certain powder handling Retail stockrooms, hospitality and security Some pharmaceutical, laboratory and medical device production Two caveats. A job title is never proof of suitability, because conditions vary between sites doing identical work. And only a small share of workers genuinely need ESD-tested footwear, so if you are unsure, ask rather than assume. One conversation with a supervisor or safety officer settles it. Four Questions That Settle It Does your PPE specification say "ESD" in writing? If the words ESD, EN 61340 or "ESD-protected area" appear, antistatic alone is not enough. Is there a footwear tester at the entrance? A tester by the door is a strong sign of a formal ESD control plan. Does the floor have ESD certification? ESD flooring almost always comes with an ESD footwear requirement. Are you handling bare components or sealed products? Bare boards and components push you towards ESD. Boxed, sealed or finished goods usually do not. The Honest Verdict ESD and antistatic are not competing features where one is the upgrade. They are two requirements with two different jobs. Antistatic is the broad safety-footwear baseline, already in every S1P shoe, aimed at keeping static from building on the person. ESD is a tighter, audited specification aimed at keeping delicate components alive, with obligations around flooring, insoles and routine testing attached. Most workers in warehousing, delivery, facilities, light trade, hospitality and retail will find antistatic S1P is what their employer accepts. A smaller group in electronics, cleanrooms and specialist manufacturing needs genuine ESD certification, and for them "it is antistatic, so it should be fine" is not an acceptable answer. Check the specification rather than the marketing copy, and if the two disagree, trust the specification. On our own shelf, for the sake of being clear: the Xnexz PulseX and StrideX are S1P, so antistatic, and they are not ESD-tested. If your site needs ESD, buy a current ESD-certified product instead. We put one beside ours in Cofra Rebecca ESD vs Xnexz StrideX, including the point where their certification wins. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your site requires ESD or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions Is antistatic the same as ESD? No. Antistatic footwear under EN ISO 20345 must measure between 0.1 MΩ and 1,000 MΩ. ESD footwear tested to EN IEC 61340 must sit in a narrower window of roughly 0.1 MΩ to 100 MΩ, often verified below 35 MΩ. ESD footwear is always antistatic too, but antistatic footwear is not automatically ESD. Are all S1P safety shoes antistatic? Yes. Antistatic performance is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classifications. You do not need to look for a separate antistatic model. Can I wear antistatic shoes in an electronics factory? Only if the site's electrostatic control plan says so. If the specification calls for ESD footwear, antistatic shoes will not satisfy it, and they may fail a footwear tester at the entrance. Ask your supervisor or ESD coordinator rather than assuming. Does antistatic footwear protect me from electric shock? No. The user information supplied with antistatic footwear states that it is not suitable for work on live electrical installations and cannot guarantee adequate protection against electric shock. It adds resistance between foot and ground, which is not the same as electrical insulation. Do antistatic or ESD shoes stop working over time? Their electrical resistance can change significantly with bending, contamination or moisture, so performance can drift out of range with wear. The standard recommends employers run an in-house resistance test at regular and frequent intervals, and many ESD sites test daily. Are Xnexz PulseX and StrideX ESD certified? No. Both are certified to EN ISO 20345 S1P, which includes antistatic performance, but neither has been tested to EN IEC 61340-4-3. If your workplace requires ESD footwear, choose a current ESD-certified product instead.
ESD vs Antistatic Shoes: The 900 MΩ Gap Nobody Mentions
ESD and antistatic sound like the same feature, and plenty of product listings treat them as if they are. They are not. Antistatic footwear certified under EN ISO 20345 must measure between 0.1 MΩ and 1,000 MΩ. ESD footwear tested to EN IEC 61340 must sit in a much narrower window, roughly 0.1 MΩ to 100 MΩ, with many suppliers testing to a stricter 35 MΩ ceiling. That gap matters. Every ESD-certified shoe is also antistatic, but an antistatic shoe is not automatically ESD, so if your site runs an ESD-protected area, antistatic alone will not satisfy the audit. Here is where the line sits, and how to work out which side of it your job is on. What "Antistatic" Actually Means on a Safety Shoe Antistatic is not an optional extra bolted onto safety footwear. It is baked into the rating system. If a shoe carries an S1, S1P, S2, S3, S6 or S7 marking under EN ISO 20345, antistatic performance is already part of that classification. There is no separate "antistatic version" to hunt for. For the full breakdown of the code, see what S1P certification actually covers. The job is narrow and specific: stop charge building up on the wearer, and let whatever does build up drain to the floor at a controlled rate. The permitted window is wide, 0.1 MΩ at the bottom to 1,000 MΩ at the top, and that width is deliberate. The lower limit protects you. If resistance drops too low the footwear starts behaving like a conductor, raising the risk if you contact a live circuit. The upper limit guards against sparks. Above 1,000 MΩ, charge stays on your body instead of draining, and a discharge becomes more likely in dusty or flammable-atmosphere settings. Everything between is a compromise. Antistatic footwear is tuned for general workplace safety, not for the tolerances of a bare microchip. What "ESD" Actually Means, and Why It Is Stricter ESD stands for electrostatic discharge. ESD footwear is not really a personal protection product in the way a toe cap is. It is a component in an electrostatic control system, governed by EN IEC 61340-5-1 and tested by the method in EN IEC 61340-4-3. The purpose flips completely. Antistatic footwear is mainly about the person and the environment. ESD footwear is mainly about the product: circuit boards, semiconductors, sensors and medical devices that can be degraded by a discharge far too small for a human to notice. Because what is being protected is so much more delicate, the acceptable range is squeezed. The commonly cited window is 0.1 MΩ to 100 MΩ, and a shoe measuring under 35 MΩ is widely treated as comfortably ESD-capable. Personnel grounding systems under the standard are typically required to come in below 35 MΩ in total, which is what most footwear testers at factory entrances are set to check. 0.1 MΩLower limit shared by both 100 MΩTypical ESD ceiling 1,000 MΩAntistatic ceiling 10xHow much tighter ESD is Seeing the Gap on a Single Scale These numbers are easier to trust side by side. The scale below is logarithmic, so each gridline is ten times more resistance than the one before it. The dark bar is the antistatic window; the gold bar is the ESD window sitting inside it. Permitted resistance windows, plotted on one scale Electrical resistance of the footwear, measured in ohms. Antistatic (EN ISO 20345, built into S1P and above)0.1 MΩ to 1,000 MΩ ESD (EN IEC 61340, tested to 61340-4-3)0.1 MΩ to 100 MΩ 0.01 MΩ 10 MΩ 10,000 MΩ Below 0.1 MΩToo conductive. Fails both, and raises electrical risk to the wearer. 100 MΩ to 1,000 MΩLegally antistatic, but outside the usual ESD window. This band is exactly where the confusion lives. Above 1,000 MΩToo insulating. Charge stays on the wearer instead of draining away. That middle zone is the whole story. A shoe measuring 400 MΩ is a perfectly valid antistatic safety shoe and a perfectly invalid ESD shoe. Nothing has been mislabelled and nobody cut a corner. It simply was not built or tested for the same job. Side by Side Comparison Feature Antistatic (A) ESD Governing standard EN ISO 20345 EN IEC 61340-5-1, tested per EN IEC 61340-4-3 Resistance range 0.1 MΩ to 1,000 MΩ Approximately 0.1 MΩ to 100 MΩ, often verified under 35 MΩ Primary purpose Reduce static build-up on the wearer and lower spark risk Protect static-sensitive components from discharge damage What it mainly protects The person and the surrounding environment The product being handled Included in S1P by default Yes No Needs matching flooring Helpful, not usually mandated Yes, footwear is only one part of the grounding path Routine on-site testing Recommended by the standard's user information Commonly required, often a daily tester at the door Insole changes allowed Avoid anything that alters the resistance path No, aftermarket insoles can invalidate the certification Typical workplaces Warehousing, delivery, facilities, workshops, hospitality, retail stockrooms Electronics assembly, semiconductor work, cleanrooms, explosives and some pharmaceutical or lab areas The one-way rule worth remembering ESD footwear is always antistatic as well, because its range sits inside the antistatic range. The reverse is not true. Buying antistatic when the specification says ESD is a real compliance gap, not a technicality. What Neither Type of Shoe Does This is the part that gets skipped, and it matters more than the resistance figures. Neither antistatic nor ESD footwear is electrical-shock protection, and neither one removes risk entirely. Not for live electrical work. The official user information supplied with antistatic footwear states plainly that it is not suitable for work on live electrical installations. It introduces resistance between foot and ground, which is not insulation and is no substitute for the controls specified for live working. No guarantee against discharge. Even correctly certified ESD footwear cannot guarantee that every discharge is prevented. It is one part of a system that includes flooring, garments, wrist straps, work surfaces and testing. Performance is not permanent. The standard's own guidance is blunt: electrical resistance can change significantly with bending, contamination or moisture. A shoe that passed on day one can drift out of range. Wet conditions are a known weak point. The user information warns that antistatic footwear might not perform its intended function in wet conditions, which is one reason wet outdoor workers are better served by waterproof S3 footwear. Because of that drift The standard recommends that employers set up an in-house electrical resistance test carried out at regular and frequent intervals. If your site relies on antistatic or ESD footwear and nobody is testing it, the paperwork says compliant while the reality may not be. Five Things That Quietly Break Antistatic and ESD Performance Aftermarket insoles. A cushioned insole from a sports shop changes the resistance path through the shoe. On ESD footwear this is one of the fastest ways to void certification. Thick or insulating socks. The path runs from skin through sock and shoe to the floor. Heavily insulating socks sit right in the middle of it. Contamination underfoot. Paint, adhesive, oil, dried plaster or compacted dust on the outsole all interfere with the discharge path. Moisture and prolonged damp. Water changes readings in both directions, and the standard flags wet conditions specifically. Insulating floor coverings. A rubber mat, thick coating or carpeted walkway breaks the grounding path no matter how good the footwear is. ESD control is a footwear and flooring system. So Which One Does Your Job Need? The honest hierarchy: the shoe listing does not decide this. Your employer's risk assessment and PPE policy decide it, and in ESD environments the site's electrostatic control plan decides it. Our guide to the UK PPE at Work Regulations covers where that duty sits. Antistatic S1P is often accepted ESD is usually specified Warehouse picking, packing and forklift work Electronics assembly and PCB handling Delivery and depot work Semiconductor and wafer environments Facilities and light maintenance Cleanrooms with a documented ESD-protected area Garages and light trade work Repair benches for static-sensitive devices Interior fit-out, painting and decorating Explosives, propellants and certain powder handling Retail stockrooms, hospitality and security Some pharmaceutical, laboratory and medical device production Two caveats. A job title is never proof of suitability, because conditions vary between sites doing identical work. And only a small share of workers genuinely need ESD-tested footwear, so if you are unsure, ask rather than assume. One conversation with a supervisor or safety officer settles it. Four Questions That Settle It Does your PPE specification say "ESD" in writing? If the words ESD, EN 61340 or "ESD-protected area" appear, antistatic alone is not enough. Is there a footwear tester at the entrance? A tester by the door is a strong sign of a formal ESD control plan. Does the floor have ESD certification? ESD flooring almost always comes with an ESD footwear requirement. Are you handling bare components or sealed products? Bare boards and components push you towards ESD. Boxed, sealed or finished goods usually do not. The Honest Verdict ESD and antistatic are not competing features where one is the upgrade. They are two requirements with two different jobs. Antistatic is the broad safety-footwear baseline, already in every S1P shoe, aimed at keeping static from building on the person. ESD is a tighter, audited specification aimed at keeping delicate components alive, with obligations around flooring, insoles and routine testing attached. Most workers in warehousing, delivery, facilities, light trade, hospitality and retail will find antistatic S1P is what their employer accepts. A smaller group in electronics, cleanrooms and specialist manufacturing needs genuine ESD certification, and for them "it is antistatic, so it should be fine" is not an acceptable answer. Check the specification rather than the marketing copy, and if the two disagree, trust the specification. On our own shelf, for the sake of being clear: the Xnexz PulseX and StrideX are S1P, so antistatic, and they are not ESD-tested. If your site needs ESD, buy a current ESD-certified product instead. We put one beside ours in Cofra Rebecca ESD vs Xnexz StrideX, including the point where their certification wins. If S1P Is Accepted Where You Work Try Xnexz in a real workday and tell us honestly how the fit, comfort and style hold up, and what we should improve. If your site requires ESD or a higher rating, buy what your safety officer specifies. That comes first. View the PulseX View the StrideX Frequently Asked Questions Is antistatic the same as ESD? No. Antistatic footwear under EN ISO 20345 must measure between 0.1 MΩ and 1,000 MΩ. ESD footwear tested to EN IEC 61340 must sit in a narrower window of roughly 0.1 MΩ to 100 MΩ, often verified below 35 MΩ. ESD footwear is always antistatic too, but antistatic footwear is not automatically ESD. Are all S1P safety shoes antistatic? Yes. Antistatic performance is part of the S1 base requirement, so it carries through S1P, S2, S3 and the newer S6 and S7 classifications. You do not need to look for a separate antistatic model. Can I wear antistatic shoes in an electronics factory? Only if the site's electrostatic control plan says so. If the specification calls for ESD footwear, antistatic shoes will not satisfy it, and they may fail a footwear tester at the entrance. Ask your supervisor or ESD coordinator rather than assuming. Does antistatic footwear protect me from electric shock? No. The user information supplied with antistatic footwear states that it is not suitable for work on live electrical installations and cannot guarantee adequate protection against electric shock. It adds resistance between foot and ground, which is not the same as electrical insulation. Do antistatic or ESD shoes stop working over time? Their electrical resistance can change significantly with bending, contamination or moisture, so performance can drift out of range with wear. The standard recommends employers run an in-house resistance test at regular and frequent intervals, and many ESD sites test daily. Are Xnexz PulseX and StrideX ESD certified? No. Both are certified to EN ISO 20345 S1P, which includes antistatic performance, but neither has been tested to EN IEC 61340-4-3. If your workplace requires ESD footwear, choose a current ESD-certified product instead.
88% Failed: Is Your Safety Shoe Actually Tested?
Safety footwear cannot legally be self-declared in the UK. It is Category II PPE, which means an independent body must issue a type-examination certificate before a CE or UKCA mark goes anywhere near the box. Untested footwear still reaches buyers anyway, industry testing has found the overwhelming majority of products from unregistered suppliers failing on performance, paperwork, or both. Quick Answer Self-certification is not allowed for safety shoes. Only Category I PPE (minimal risk) can be self-declared. Safety footwear is Category II. A notified or approved body must issue an EU/UK type-examination certificate before the product can be marked and sold. The CE mark on its own is not proof. It can be printed by anyone. The paperwork behind it is what counts. Ask for the Declaration of Conformity. A legitimate supplier can produce it. That single request filters out most of the risk. Employers carry the legal duty to ensure the PPE they provide is genuinely certified, not just that it's being worn. In This Guide What "self-declared" really means. Can safety shoes be self-certified?. What real certification involves. Why the CE mark proves nothing. How widespread is the problem?. The risk to workers and employers. How to check before you buy. Where Xnexz stands. Quick FAQ. What Does "Self-Declared" Actually Mean? A self-declared product is one where the manufacturer alone decides it meets the standard, with no independent body checking. For some low-risk products that's perfectly legal. For safety footwear it isn't, and a shoe sold that way has never been verified by anyone but the person selling it. PPE is split into three risk categories under the regulations. Category I covers minimal risks, gardening gloves, sunglasses, where the wearer can spot a problem themselves in good time. Manufacturers can self-declare those, compile a technical file, and mark them without involving anyone else. Category III covers risks that are fatal or irreversible, such as respiratory or fall-arrest equipment. Category II sits between the two: risks of serious injury that a wearer cannot reliably judge for themselves. Safety footwear lives here, and that placement is the entire point, you cannot look at a toe cap and tell whether it will survive a 200-joule impact. Can Safety Shoes Legally Be Self-Certified in the UK? No. Because safety footwear is Category II PPE, an independent notified body (for CE) or approved body (for UKCA) must carry out an EU or UK type-examination before the product can carry a conformity mark. Self-certification is not an available route. The framework comes from Regulation (EU) 2016/425, which continues to apply in Great Britain alongside the Personal Protective Equipment (Enforcement) Regulations 2018. Manufacturers, importers, distributors and online sellers all carry duties under it, the obligation doesn't stop at the factory gate. So when a listing describes footwear as "self-certified" or "manufacturer certified," that isn't a lesser-but-acceptable grade of compliance. For this product category it means the legally required step was skipped. Our overview of the UK PPE at Work Regulations covers where those duties fall for employers and workers. What Does Genuine Certification Actually Involve? A real certificate means samples were physically tested in an accredited laboratory against EN ISO 20345, an independent body reviewed the technical file and issued a type-examination certificate, and only then did the manufacturer draw up a Declaration of Conformity and apply the mark. The sequence matters, because each step is a place where a dishonest supplier can cut corners: Laboratory testing. Physical samples are tested against the standard, toe cap impact and compression, midsole puncture resistance, slip resistance, antistatic properties and more, depending on the claimed rating. Type-examination (Module B). An independent notified or approved body reviews the technical construction file, checks the test evidence, and confirms the design meets the requirements. It issues a certificate with a number. Production control (Module C). The manufacturer must keep internal controls so that what leaves the line matches the sample that passed. Certification covers a design, not a promise about every future pair. Declaration of Conformity. The manufacturer formally declares compliance, in writing, and must be able to supply it along with user instructions and technical documentation. Only after all of that can the CE or UKCA mark legitimately be applied. If you want the technical side of what's being tested, our guide to EN ISO 20345 explained breaks down what each rating actually requires. Why Doesn't the CE Mark Prove a Shoe Was Tested? Because the CE mark is applied by the manufacturer, not issued by a regulator. It's two letters printed on a label. Anyone willing to break the law can print them, and for Category II footwear there isn't even a notified body number alongside to check. This is the detail that catches out careful buyers. On Category III PPE, the four-digit number of the body monitoring production appears next to the CE mark, giving you something concrete to verify. On Category II footwear, that number is not required beside the mark, so a lone CE symbol on a boot tells you nothing about who, if anyone, examined it. The verifiable trail sits elsewhere: the notified or approved body's name, address and number must appear in the user information supplied with the footwear, and the Declaration of Conformity must be available on request. That paperwork, not the printed symbol, is the evidence. The single most useful question you can ask a supplier: "Can you send me the Declaration of Conformity and the type-examination certificate for this model?" A legitimate seller answers within a day. An untested product cannot produce them at all. How Widespread Is Untested Safety Footwear? More common than most buyers assume, particularly on online marketplaces. British Safety Industry Federation testing has repeatedly found the large majority of PPE from unregistered sources failing on performance claims, documentation, or both. In one BSIF testing programme covering footwear examined between December 2021 and December 2022, only five of 42 products from suppliers outside its Registered Safety Supplier Scheme were found fully compliant. Across its wider PPE testing, the federation has reported roughly the inverse pass rates between registered and unregistered sources, around nine in ten passing from registered suppliers, and a similar proportion failing from unregistered ones. 88% of tested products from unregistered suppliers showed failures against performance claims and/or documentation (BSIF) 5 of 42 footwear products from unregistered suppliers found fully compliant in one BSIF testing period ~9 in 10 PPE items from BSIF-registered suppliers passed compliance testing More recent BSIF testing has continued to find unsafe PPE circulating on online marketplaces, including footwear bought online that lacked basic mandatory protective components. This is not a historical problem that regulation has since tidied up. Case in point · A UK recall In 2025, the Office for Product Safety and Standards recalled safety shoes sold through a major social commerce platform. The listing advertised the footwear as anti-smash and anti-puncture, using exactly the language a worker would search for. OPSS found no evidence the product had undergone conformity assessment as PPE, and it carried neither CE nor UKCA marking. The regulator judged it to present a serious risk of injuries and found it failed to meet the requirements of the PPE regulations. The listing was removed after enforcement action, but industry commentators noted that similar footwear remained available on other marketplaces. Removal of one listing does not clear the shelf. What's the Real Risk to Workers and Employers? For workers, the risk is protection that simply isn't there when it's needed. For employers, it's a legal exposure, the duty is to provide PPE that is genuinely certified, and a supplier's unverified word is not a defence. The risk to the wearer A toe cap that may not withstand a real impact A midsole that may not stop a nail Slip resistance below the mandatory minimum Materials that degrade far sooner than expected False confidence, the worst outcome of all The risk to the employer Breach of the duty to provide suitable, certified PPE Enforcement action under the PPE regulations Duties now extend to some non-employed workers Insurance and liability complications after an incident Difficulty evidencing compliance in an investigation There's a particular gap worth flagging: workers who are given a budget to buy their own safety footwear. They're often the least equipped to assess certification paperwork, and the most likely to buy from whichever marketplace listing looks like good value. If your organisation does this, the sourcing guidance matters as much as the budget. How Do You Check Your Safety Shoes Were Really Tested? Ask for the documentation, check the markings on the shoe itself, and buy from suppliers who can be held accountable. Three straightforward habits filter out most untested footwear. Check What good looks like Warning sign Documentation Declaration of Conformity supplied on request Vague replies, delays, or "it's CE, that's enough" User information Notified/approved body name, address and number included No booklet, or a generic photocopied insert Shoe markings Full rating (e.g. S1P), standard, size, date of manufacture Only a CE logo and a size Claim language Specific ratings tied to the standard "Anti-smash", "anti-puncture" with no rating cited Seller Named UK business, traceable, answers technical questions Anonymous marketplace seller, no contact route One more habit worth building: check that the rating on the paperwork matches the rating your workplace actually requires. A genuine certificate for the wrong class is still the wrong shoe. Our UK safety shoes buying checklist runs through that step by step. Where Does Xnexz Stand on This? Xnexz PulseX and StrideX are EN ISO 20345 S1P certified, and we think any brand making that claim should be willing to evidence it on request rather than expecting you to take it on trust. We're a new UK brand. We don't have decades of reputation to lean on, which is precisely why we'd rather point you at paperwork than adjectives. If you want to see the certification documentation for either model before you buy, or you're a safety officer who needs it for a PPE file, ask us and we'll send it. We'd also rather you applied the checks in this article to us as rigorously as to anyone else. If a supplier, including this one, can't produce documentation for a protective claim, that tells you something worth knowing. And if S1P isn't what your site requires, no amount of certification on our part makes our footwear the right choice, your employer's risk assessment decides that, not us. Self-Declared vs Tested Safety Shoes: Quick FAQ Is a CE mark enough to prove safety shoes are certified? No. The manufacturer applies the mark themselves, and for Category II footwear no notified body number sits beside it. The Declaration of Conformity and type-examination certificate are the real evidence. What is a Declaration of Conformity? A formal written statement from the manufacturer declaring the product meets the applicable requirements, referencing the standards and the certificate behind it. Suppliers of Category II footwear must be able to provide it. Are cheap safety shoes automatically untested? No, price and compliance are separate issues, and there are legitimately certified budget options. The pattern in testing data relates to unaccountable sourcing, particularly anonymous marketplace listings, rather than low price by itself. What should I do if I think my work shoes aren't certified? Raise it with your employer or safety representative and ask to see the documentation. If footwear was supplied as PPE, the organisation providing it should be able to evidence its certification. Does UKCA or CE marking apply in Great Britain? Both markings are encountered in the GB market, and requirements have shifted over recent years. Check the current position with your supplier or the relevant guidance, as arrangements have been subject to change. The Honest Verdict The gap between self-declared and independently tested safety footwear isn't a technicality, it's the difference between protection that has been proven and protection that has only been claimed. The reassuring part is how simple the defence is. You don't need to understand impact testing to stay safe here; you need to ask one question about documentation and decline to buy when it goes unanswered. Suppliers who have done the work can answer it easily. Those who haven't, can't, and that silence is the most useful information you'll get. Ask Us for the Paperwork If your workplace accepts S1P footwear and you're considering Xnexz, request our certification documentation before you buy, we'd rather you checked. And if you do wear a pair on a real shift, tell us honestly how the fit, comfort and quality hold up, and what we should improve. Explore Xnexz PulseX
88% Failed: Is Your Safety Shoe Actually Tested?
Safety footwear cannot legally be self-declared in the UK. It is Category II PPE, which means an independent body must issue a type-examination certificate before a CE or UKCA mark goes anywhere near the box. Untested footwear still reaches buyers anyway, industry testing has found the overwhelming majority of products from unregistered suppliers failing on performance, paperwork, or both. Quick Answer Self-certification is not allowed for safety shoes. Only Category I PPE (minimal risk) can be self-declared. Safety footwear is Category II. A notified or approved body must issue an EU/UK type-examination certificate before the product can be marked and sold. The CE mark on its own is not proof. It can be printed by anyone. The paperwork behind it is what counts. Ask for the Declaration of Conformity. A legitimate supplier can produce it. That single request filters out most of the risk. Employers carry the legal duty to ensure the PPE they provide is genuinely certified, not just that it's being worn. In This Guide What "self-declared" really means. Can safety shoes be self-certified?. What real certification involves. Why the CE mark proves nothing. How widespread is the problem?. The risk to workers and employers. How to check before you buy. Where Xnexz stands. Quick FAQ. What Does "Self-Declared" Actually Mean? A self-declared product is one where the manufacturer alone decides it meets the standard, with no independent body checking. For some low-risk products that's perfectly legal. For safety footwear it isn't, and a shoe sold that way has never been verified by anyone but the person selling it. PPE is split into three risk categories under the regulations. Category I covers minimal risks, gardening gloves, sunglasses, where the wearer can spot a problem themselves in good time. Manufacturers can self-declare those, compile a technical file, and mark them without involving anyone else. Category III covers risks that are fatal or irreversible, such as respiratory or fall-arrest equipment. Category II sits between the two: risks of serious injury that a wearer cannot reliably judge for themselves. Safety footwear lives here, and that placement is the entire point, you cannot look at a toe cap and tell whether it will survive a 200-joule impact. Can Safety Shoes Legally Be Self-Certified in the UK? No. Because safety footwear is Category II PPE, an independent notified body (for CE) or approved body (for UKCA) must carry out an EU or UK type-examination before the product can carry a conformity mark. Self-certification is not an available route. The framework comes from Regulation (EU) 2016/425, which continues to apply in Great Britain alongside the Personal Protective Equipment (Enforcement) Regulations 2018. Manufacturers, importers, distributors and online sellers all carry duties under it, the obligation doesn't stop at the factory gate. So when a listing describes footwear as "self-certified" or "manufacturer certified," that isn't a lesser-but-acceptable grade of compliance. For this product category it means the legally required step was skipped. Our overview of the UK PPE at Work Regulations covers where those duties fall for employers and workers. What Does Genuine Certification Actually Involve? A real certificate means samples were physically tested in an accredited laboratory against EN ISO 20345, an independent body reviewed the technical file and issued a type-examination certificate, and only then did the manufacturer draw up a Declaration of Conformity and apply the mark. The sequence matters, because each step is a place where a dishonest supplier can cut corners: Laboratory testing. Physical samples are tested against the standard, toe cap impact and compression, midsole puncture resistance, slip resistance, antistatic properties and more, depending on the claimed rating. Type-examination (Module B). An independent notified or approved body reviews the technical construction file, checks the test evidence, and confirms the design meets the requirements. It issues a certificate with a number. Production control (Module C). The manufacturer must keep internal controls so that what leaves the line matches the sample that passed. Certification covers a design, not a promise about every future pair. Declaration of Conformity. The manufacturer formally declares compliance, in writing, and must be able to supply it along with user instructions and technical documentation. Only after all of that can the CE or UKCA mark legitimately be applied. If you want the technical side of what's being tested, our guide to EN ISO 20345 explained breaks down what each rating actually requires. Why Doesn't the CE Mark Prove a Shoe Was Tested? Because the CE mark is applied by the manufacturer, not issued by a regulator. It's two letters printed on a label. Anyone willing to break the law can print them, and for Category II footwear there isn't even a notified body number alongside to check. This is the detail that catches out careful buyers. On Category III PPE, the four-digit number of the body monitoring production appears next to the CE mark, giving you something concrete to verify. On Category II footwear, that number is not required beside the mark, so a lone CE symbol on a boot tells you nothing about who, if anyone, examined it. The verifiable trail sits elsewhere: the notified or approved body's name, address and number must appear in the user information supplied with the footwear, and the Declaration of Conformity must be available on request. That paperwork, not the printed symbol, is the evidence. The single most useful question you can ask a supplier: "Can you send me the Declaration of Conformity and the type-examination certificate for this model?" A legitimate seller answers within a day. An untested product cannot produce them at all. How Widespread Is Untested Safety Footwear? More common than most buyers assume, particularly on online marketplaces. British Safety Industry Federation testing has repeatedly found the large majority of PPE from unregistered sources failing on performance claims, documentation, or both. In one BSIF testing programme covering footwear examined between December 2021 and December 2022, only five of 42 products from suppliers outside its Registered Safety Supplier Scheme were found fully compliant. Across its wider PPE testing, the federation has reported roughly the inverse pass rates between registered and unregistered sources, around nine in ten passing from registered suppliers, and a similar proportion failing from unregistered ones. 88% of tested products from unregistered suppliers showed failures against performance claims and/or documentation (BSIF) 5 of 42 footwear products from unregistered suppliers found fully compliant in one BSIF testing period ~9 in 10 PPE items from BSIF-registered suppliers passed compliance testing More recent BSIF testing has continued to find unsafe PPE circulating on online marketplaces, including footwear bought online that lacked basic mandatory protective components. This is not a historical problem that regulation has since tidied up. Case in point · A UK recall In 2025, the Office for Product Safety and Standards recalled safety shoes sold through a major social commerce platform. The listing advertised the footwear as anti-smash and anti-puncture, using exactly the language a worker would search for. OPSS found no evidence the product had undergone conformity assessment as PPE, and it carried neither CE nor UKCA marking. The regulator judged it to present a serious risk of injuries and found it failed to meet the requirements of the PPE regulations. The listing was removed after enforcement action, but industry commentators noted that similar footwear remained available on other marketplaces. Removal of one listing does not clear the shelf. What's the Real Risk to Workers and Employers? For workers, the risk is protection that simply isn't there when it's needed. For employers, it's a legal exposure, the duty is to provide PPE that is genuinely certified, and a supplier's unverified word is not a defence. The risk to the wearer A toe cap that may not withstand a real impact A midsole that may not stop a nail Slip resistance below the mandatory minimum Materials that degrade far sooner than expected False confidence, the worst outcome of all The risk to the employer Breach of the duty to provide suitable, certified PPE Enforcement action under the PPE regulations Duties now extend to some non-employed workers Insurance and liability complications after an incident Difficulty evidencing compliance in an investigation There's a particular gap worth flagging: workers who are given a budget to buy their own safety footwear. They're often the least equipped to assess certification paperwork, and the most likely to buy from whichever marketplace listing looks like good value. If your organisation does this, the sourcing guidance matters as much as the budget. How Do You Check Your Safety Shoes Were Really Tested? Ask for the documentation, check the markings on the shoe itself, and buy from suppliers who can be held accountable. Three straightforward habits filter out most untested footwear. Check What good looks like Warning sign Documentation Declaration of Conformity supplied on request Vague replies, delays, or "it's CE, that's enough" User information Notified/approved body name, address and number included No booklet, or a generic photocopied insert Shoe markings Full rating (e.g. S1P), standard, size, date of manufacture Only a CE logo and a size Claim language Specific ratings tied to the standard "Anti-smash", "anti-puncture" with no rating cited Seller Named UK business, traceable, answers technical questions Anonymous marketplace seller, no contact route One more habit worth building: check that the rating on the paperwork matches the rating your workplace actually requires. A genuine certificate for the wrong class is still the wrong shoe. Our UK safety shoes buying checklist runs through that step by step. Where Does Xnexz Stand on This? Xnexz PulseX and StrideX are EN ISO 20345 S1P certified, and we think any brand making that claim should be willing to evidence it on request rather than expecting you to take it on trust. We're a new UK brand. We don't have decades of reputation to lean on, which is precisely why we'd rather point you at paperwork than adjectives. If you want to see the certification documentation for either model before you buy, or you're a safety officer who needs it for a PPE file, ask us and we'll send it. We'd also rather you applied the checks in this article to us as rigorously as to anyone else. If a supplier, including this one, can't produce documentation for a protective claim, that tells you something worth knowing. And if S1P isn't what your site requires, no amount of certification on our part makes our footwear the right choice, your employer's risk assessment decides that, not us. Self-Declared vs Tested Safety Shoes: Quick FAQ Is a CE mark enough to prove safety shoes are certified? No. The manufacturer applies the mark themselves, and for Category II footwear no notified body number sits beside it. The Declaration of Conformity and type-examination certificate are the real evidence. What is a Declaration of Conformity? A formal written statement from the manufacturer declaring the product meets the applicable requirements, referencing the standards and the certificate behind it. Suppliers of Category II footwear must be able to provide it. Are cheap safety shoes automatically untested? No, price and compliance are separate issues, and there are legitimately certified budget options. The pattern in testing data relates to unaccountable sourcing, particularly anonymous marketplace listings, rather than low price by itself. What should I do if I think my work shoes aren't certified? Raise it with your employer or safety representative and ask to see the documentation. If footwear was supplied as PPE, the organisation providing it should be able to evidence its certification. Does UKCA or CE marking apply in Great Britain? Both markings are encountered in the GB market, and requirements have shifted over recent years. Check the current position with your supplier or the relevant guidance, as arrangements have been subject to change. The Honest Verdict The gap between self-declared and independently tested safety footwear isn't a technicality, it's the difference between protection that has been proven and protection that has only been claimed. The reassuring part is how simple the defence is. You don't need to understand impact testing to stay safe here; you need to ask one question about documentation and decline to buy when it goes unanswered. Suppliers who have done the work can answer it easily. Those who haven't, can't, and that silence is the most useful information you'll get. Ask Us for the Paperwork If your workplace accepts S1P footwear and you're considering Xnexz, request our certification documentation before you buy, we'd rather you checked. And if you do wear a pair on a real shift, tell us honestly how the fit, comfort and quality hold up, and what we should improve. Explore Xnexz PulseX
S6 vs S7 Safety Boots: The New Waterproof Rules Explained
S6 and S7 are new safety footwear classes introduced by EN ISO 20345:2022, and both mean one thing: the whole shoe is waterproof, not just the upper. S6 is the waterproof version of S2. S7 is the waterproof version of S3, with a puncture-resistant midsole and cleated outsole. This guide explains what changed, what the WR and WPA markings really mean, who genuinely needs this level of protection, and who is paying for water resistance they will never use. Quick Answer S6 = S2 + WR - a waterproof shoe without a puncture-resistant midsole. S7 = S3 + WR - waterproof, plus puncture resistance and a cleated outsole. WR tests the whole shoe. WPA tests the upper only. They are not the same thing, and the difference matters. The water test got stricter. Under the 2022 standard, no water penetration may be detected at all. Most indoor workers don't need S6 or S7 - they're built for wet, outdoor and washdown environments. In This Guide What S6 and S7 actually mean. Why the ratings were introduced. WR vs WPA: the key difference. S6 vs S7 compared. How the water test changed. Do you actually need S6 or S7?. When you'll see them in shops. Where Xnexz fits (honestly). Quick FAQ. What Do S6 and S7 Mean on Safety Footwear? S6 and S7 are waterproof safety footwear classes added in EN ISO 20345:2022. S6 takes everything in an S2 shoe and adds whole-shoe waterproofing (WR). S7 does the same for S3, so it is waterproof and has a puncture-resistant midsole and a cleated outsole. Before 2022, a waterproof safety boot had no class of its own. Manufacturers wrote it as "S3 WR" - the base class, plus a separate water-resistance marking bolted on the end. That worked, but it was easy to miss on a label and easy to confuse with the water-resistance marking that only covered the upper material. The 2022 revision gave whole-shoe waterproofing its own place on the ladder. If you already know how S2 compares with S1P, S6 and S7 make immediate sense: the same protection, plus a boot built to keep water out as a sealed unit. There are also two S7 sub-variants, S7L and S7S, which describe how the puncture resistance was tested, L with a 4.5 mm test nail, S with a finer 3.0 mm nail. For the whole ladder in one place, our guide to safety shoe ratings from SB to S7 lays out every class side by side. Why Were S6 and S7 Introduced? They were introduced to end a long-running confusion: the old marking for a water-resistant upper was easy to mistake for a fully waterproof shoe. S6 and S7 make true whole-shoe waterproofing visible at a glance. Under the 2011 standard, the marking WRU stood for "water repellent upper." It told you the leather or fabric on top had been treated to resist water. It said nothing about the seams, the tongue, the lining, or where the upper meets the sole, which is exactly where water tends to get in first. Plenty of buyers read WRU as "waterproof," bought accordingly, and ended up with wet socks by mid-morning. The 2022 revision addressed this in two ways: it renamed the upper-only test to WPA, and it promoted genuine whole-shoe waterproofing into named classes of its own. The intent was to make the label harder to misread. What's the Difference Between WR and WPA? WPA covers the upper material only and allows some water penetration and absorption. WR covers the entire shoe as a sealed unit and allows none. S6 and S7 footwear carries WR. This is the single most useful thing to take away from the 2022 update, because the two markings sit next to each other on labels and look similarly reassuring. Marking What it covers What it allows Best read as WPA The upper material and its seams Some water penetration and absorption Handles splashes and damp; not for standing water WR The whole shoe as a complete unit No water penetration detected in the test Built for genuinely wet conditions WPA replaced WRU, and it is still a useful marking, it usually means a more breathable shoe than a fully sealed one, which matters if you work indoors and your feet get hot. It simply isn't the same promise as WR. A shoe marked WPA is designed to cope with a spill or a damp floor, not a morning spent in puddles. S6 vs S7: Which One Do You Need? Choose S6 if you need waterproofing but have no sharp-object risk underfoot. Choose S7 if you need waterproofing plus protection from nails and debris, and grip on uneven or outdoor ground. The gap between them is the same gap that has always separated S2 from S3: puncture resistance and outsole design. Feature S6 S7 Based on S2 S3 200J toe cap Yes Yes Antistatic & heel energy absorption Yes Yes Whole-shoe waterproof (WR) Yes Yes Puncture-resistant midsole No Yes Cleated (lugged) outsole No Yes Typical use Wet indoor work, food processing, washdown areas Outdoor sites, groundworks, wet ground with debris In practice, S7 is the class most outdoor site workers will be pointed toward, because it is simply the waterproof version of the rating their site already specifies. If your risk assessment currently calls for S3 safety shoes, S7 is the same protection with proper waterproofing added. How Did the Water Test Itself Change? The test method stayed broadly the same, but the pass mark got tougher. The older standard allowed a small measured area of water penetration and still counted it as a pass. The 2022 standard requires that no water penetration is detected. ~3 cm² of water penetration was still a pass under the older standard Zero water penetration permitted for a WR pass under EN ISO 20345:2022 80 min minimum duration commonly cited for the whole-shoe WR test This is why a boot marked WR today is making a stronger claim than one marked WR a few years ago. The test itself is a walking simulation in a water trough, so it reflects flexing and movement rather than a shoe sitting still. It's a meaningfully harder bar to clear. Worth remembering, though: certification describes a shoe when it is new and correctly fitted. Waterproof membranes and seams wear with use, and a scuffed or split boot will not perform the way the lab sample did. No rating removes the need to check the condition of your footwear. Do You Actually Need S6 or S7 Footwear? Only if you regularly work in genuinely wet conditions. Waterproof membranes reduce breathability, so buying S6 or S7 for dry indoor work usually means hotter, sweatier feet for protection you never use. S6 or S7 is likely worth it Outdoor site work in British weather Groundworks, landscaping, utilities Food processing and washdown areas Agriculture, waste and recycling Anywhere standing water is routine You probably don't need it Warehouse and distribution floors Retail stockrooms Indoor fit-out and decorating Light maintenance and facilities work Hospitality, where spills are occasional The deciding factor isn't the weather forecast, it's your employer. Your workplace PPE policy and risk assessment set the required rating. If your site specifies S7, no amount of comfort reasoning makes an S1P trainer acceptable. Check the requirement first, then choose within it. When Will You See S6 and S7 on UK Shelves? You already can, and the numbers will grow steadily. New certifications have had to use the 2022 standard since late 2024, but footwear certified under the older 2011 standard stays valid until its certificate expires, so both labelling systems will sit side by side for a few more years. That overlap is the practical headache for buyers right now. On the same shelf you may find one boot marked "S3 WR" under the older standard and another marked "S7" under the new one, describing broadly the same thing. Neither is out of date or non-compliant, but if you're replacing one pair from a matched set, check which standard each was certified to rather than assuming the markings map perfectly. Where Does Xnexz Fit Into This? Honestly: we don't make S6 or S7 footwear. Xnexz PulseX and StrideX are EN ISO 20345 S1P certified, which means they are not waterproof and are not intended for wet outdoor work. We'd rather say that plainly than stretch a description to sound like more than it is. S1P covers a 200J toe cap, a puncture-resistant midsole, antistatic properties and heel energy absorption. It does not include whole-shoe waterproofing, and a breathable mesh upper is designed to let air move, the opposite of a sealed waterproof construction. So if your work involves standing water, wet ground, washdown areas or full days outdoors in the rain, Xnexz is the wrong choice, and we'd point you toward a brand with a proper S6 or S7 range. Established names like Caterpillar, Timberland PRO, uvex and Cofra offer waterproof options with track records we don't have yet as a new UK brand. What Xnexz is built for is the other side of that line: dry, controlled indoor settings where S1P is accepted, warehouses, depots, stockrooms, indoor fit-out, light maintenance and delivery work. If that describes your shift and you want a lighter, more trainer-like feel, that's where we're trying to do something worth your attention. S6 and S7 Safety Footwear: Quick FAQ Is S7 just S3 with a waterproof label? Essentially, yes. S7 carries the same requirements as S3, toe cap, antistatic build, heel energy absorption, puncture-resistant midsole and cleated outsole, with whole-shoe waterproofing (WR) added and recognised as its own class. Does WPA mean my boots are waterproof? No. WPA applies to the upper material and permits some water penetration and absorption. It's suited to splashes and damp conditions, not standing water. Look for WR, S6 or S7 if you need genuine waterproofing. Are my existing S3 WR boots still valid? Yes. Footwear certified to the earlier standard remains compliant until its certificate expires, so there's no need to replace a serviceable pair simply because the marking system has changed. What do S7L and S7S mean? They indicate how puncture resistance was tested. S7L uses a 4.5 mm test nail with a non-metallic insert, and S7S uses a finer 3.0 mm nail. The finer nail is the more demanding test for small, sharp hazards. Does Xnexz sell S6 or S7 safety shoes? No. Our current PulseX and StrideX models are S1P certified and are not waterproof. For wet or outdoor work that requires S6 or S7, choose a brand that makes footwear certified to that class. The Honest Verdict S6 and S7 are a genuine improvement to safety footwear labelling. They take whole-shoe waterproofing out of the small print and give it a clear place on the rating ladder, and the stricter WR test means the claim carries more weight than it used to. The practical advice is unchanged though: match the rating to the actual hazard. If your feet get properly wet at work, S6 or S7 is worth the money and the reduced breathability. If they don't, you'll likely be more comfortable in footwear designed to let air through, and your employer's PPE requirement decides either way. Working Indoors, Where S1P Is Accepted? If your workplace accepts S1P footwear and wet conditions aren't part of your day, we'd like you to try Xnexz PulseX or StrideX on a real shift. Tell us honestly how the fit, comfort and style feel, and what we should improve next. Explore Xnexz PulseX
S6 vs S7 Safety Boots: The New Waterproof Rules Explained
S6 and S7 are new safety footwear classes introduced by EN ISO 20345:2022, and both mean one thing: the whole shoe is waterproof, not just the upper. S6 is the waterproof version of S2. S7 is the waterproof version of S3, with a puncture-resistant midsole and cleated outsole. This guide explains what changed, what the WR and WPA markings really mean, who genuinely needs this level of protection, and who is paying for water resistance they will never use. Quick Answer S6 = S2 + WR - a waterproof shoe without a puncture-resistant midsole. S7 = S3 + WR - waterproof, plus puncture resistance and a cleated outsole. WR tests the whole shoe. WPA tests the upper only. They are not the same thing, and the difference matters. The water test got stricter. Under the 2022 standard, no water penetration may be detected at all. Most indoor workers don't need S6 or S7 - they're built for wet, outdoor and washdown environments. In This Guide What S6 and S7 actually mean. Why the ratings were introduced. WR vs WPA: the key difference. S6 vs S7 compared. How the water test changed. Do you actually need S6 or S7?. When you'll see them in shops. Where Xnexz fits (honestly). Quick FAQ. What Do S6 and S7 Mean on Safety Footwear? S6 and S7 are waterproof safety footwear classes added in EN ISO 20345:2022. S6 takes everything in an S2 shoe and adds whole-shoe waterproofing (WR). S7 does the same for S3, so it is waterproof and has a puncture-resistant midsole and a cleated outsole. Before 2022, a waterproof safety boot had no class of its own. Manufacturers wrote it as "S3 WR" - the base class, plus a separate water-resistance marking bolted on the end. That worked, but it was easy to miss on a label and easy to confuse with the water-resistance marking that only covered the upper material. The 2022 revision gave whole-shoe waterproofing its own place on the ladder. If you already know how S2 compares with S1P, S6 and S7 make immediate sense: the same protection, plus a boot built to keep water out as a sealed unit. There are also two S7 sub-variants, S7L and S7S, which describe how the puncture resistance was tested, L with a 4.5 mm test nail, S with a finer 3.0 mm nail. For the whole ladder in one place, our guide to safety shoe ratings from SB to S7 lays out every class side by side. Why Were S6 and S7 Introduced? They were introduced to end a long-running confusion: the old marking for a water-resistant upper was easy to mistake for a fully waterproof shoe. S6 and S7 make true whole-shoe waterproofing visible at a glance. Under the 2011 standard, the marking WRU stood for "water repellent upper." It told you the leather or fabric on top had been treated to resist water. It said nothing about the seams, the tongue, the lining, or where the upper meets the sole, which is exactly where water tends to get in first. Plenty of buyers read WRU as "waterproof," bought accordingly, and ended up with wet socks by mid-morning. The 2022 revision addressed this in two ways: it renamed the upper-only test to WPA, and it promoted genuine whole-shoe waterproofing into named classes of its own. The intent was to make the label harder to misread. What's the Difference Between WR and WPA? WPA covers the upper material only and allows some water penetration and absorption. WR covers the entire shoe as a sealed unit and allows none. S6 and S7 footwear carries WR. This is the single most useful thing to take away from the 2022 update, because the two markings sit next to each other on labels and look similarly reassuring. Marking What it covers What it allows Best read as WPA The upper material and its seams Some water penetration and absorption Handles splashes and damp; not for standing water WR The whole shoe as a complete unit No water penetration detected in the test Built for genuinely wet conditions WPA replaced WRU, and it is still a useful marking, it usually means a more breathable shoe than a fully sealed one, which matters if you work indoors and your feet get hot. It simply isn't the same promise as WR. A shoe marked WPA is designed to cope with a spill or a damp floor, not a morning spent in puddles. S6 vs S7: Which One Do You Need? Choose S6 if you need waterproofing but have no sharp-object risk underfoot. Choose S7 if you need waterproofing plus protection from nails and debris, and grip on uneven or outdoor ground. The gap between them is the same gap that has always separated S2 from S3: puncture resistance and outsole design. Feature S6 S7 Based on S2 S3 200J toe cap Yes Yes Antistatic & heel energy absorption Yes Yes Whole-shoe waterproof (WR) Yes Yes Puncture-resistant midsole No Yes Cleated (lugged) outsole No Yes Typical use Wet indoor work, food processing, washdown areas Outdoor sites, groundworks, wet ground with debris In practice, S7 is the class most outdoor site workers will be pointed toward, because it is simply the waterproof version of the rating their site already specifies. If your risk assessment currently calls for S3 safety shoes, S7 is the same protection with proper waterproofing added. How Did the Water Test Itself Change? The test method stayed broadly the same, but the pass mark got tougher. The older standard allowed a small measured area of water penetration and still counted it as a pass. The 2022 standard requires that no water penetration is detected. ~3 cm² of water penetration was still a pass under the older standard Zero water penetration permitted for a WR pass under EN ISO 20345:2022 80 min minimum duration commonly cited for the whole-shoe WR test This is why a boot marked WR today is making a stronger claim than one marked WR a few years ago. The test itself is a walking simulation in a water trough, so it reflects flexing and movement rather than a shoe sitting still. It's a meaningfully harder bar to clear. Worth remembering, though: certification describes a shoe when it is new and correctly fitted. Waterproof membranes and seams wear with use, and a scuffed or split boot will not perform the way the lab sample did. No rating removes the need to check the condition of your footwear. Do You Actually Need S6 or S7 Footwear? Only if you regularly work in genuinely wet conditions. Waterproof membranes reduce breathability, so buying S6 or S7 for dry indoor work usually means hotter, sweatier feet for protection you never use. S6 or S7 is likely worth it Outdoor site work in British weather Groundworks, landscaping, utilities Food processing and washdown areas Agriculture, waste and recycling Anywhere standing water is routine You probably don't need it Warehouse and distribution floors Retail stockrooms Indoor fit-out and decorating Light maintenance and facilities work Hospitality, where spills are occasional The deciding factor isn't the weather forecast, it's your employer. Your workplace PPE policy and risk assessment set the required rating. If your site specifies S7, no amount of comfort reasoning makes an S1P trainer acceptable. Check the requirement first, then choose within it. When Will You See S6 and S7 on UK Shelves? You already can, and the numbers will grow steadily. New certifications have had to use the 2022 standard since late 2024, but footwear certified under the older 2011 standard stays valid until its certificate expires, so both labelling systems will sit side by side for a few more years. That overlap is the practical headache for buyers right now. On the same shelf you may find one boot marked "S3 WR" under the older standard and another marked "S7" under the new one, describing broadly the same thing. Neither is out of date or non-compliant, but if you're replacing one pair from a matched set, check which standard each was certified to rather than assuming the markings map perfectly. Where Does Xnexz Fit Into This? Honestly: we don't make S6 or S7 footwear. Xnexz PulseX and StrideX are EN ISO 20345 S1P certified, which means they are not waterproof and are not intended for wet outdoor work. We'd rather say that plainly than stretch a description to sound like more than it is. S1P covers a 200J toe cap, a puncture-resistant midsole, antistatic properties and heel energy absorption. It does not include whole-shoe waterproofing, and a breathable mesh upper is designed to let air move, the opposite of a sealed waterproof construction. So if your work involves standing water, wet ground, washdown areas or full days outdoors in the rain, Xnexz is the wrong choice, and we'd point you toward a brand with a proper S6 or S7 range. Established names like Caterpillar, Timberland PRO, uvex and Cofra offer waterproof options with track records we don't have yet as a new UK brand. What Xnexz is built for is the other side of that line: dry, controlled indoor settings where S1P is accepted, warehouses, depots, stockrooms, indoor fit-out, light maintenance and delivery work. If that describes your shift and you want a lighter, more trainer-like feel, that's where we're trying to do something worth your attention. S6 and S7 Safety Footwear: Quick FAQ Is S7 just S3 with a waterproof label? Essentially, yes. S7 carries the same requirements as S3, toe cap, antistatic build, heel energy absorption, puncture-resistant midsole and cleated outsole, with whole-shoe waterproofing (WR) added and recognised as its own class. Does WPA mean my boots are waterproof? No. WPA applies to the upper material and permits some water penetration and absorption. It's suited to splashes and damp conditions, not standing water. Look for WR, S6 or S7 if you need genuine waterproofing. Are my existing S3 WR boots still valid? Yes. Footwear certified to the earlier standard remains compliant until its certificate expires, so there's no need to replace a serviceable pair simply because the marking system has changed. What do S7L and S7S mean? They indicate how puncture resistance was tested. S7L uses a 4.5 mm test nail with a non-metallic insert, and S7S uses a finer 3.0 mm nail. The finer nail is the more demanding test for small, sharp hazards. Does Xnexz sell S6 or S7 safety shoes? No. Our current PulseX and StrideX models are S1P certified and are not waterproof. For wet or outdoor work that requires S6 or S7, choose a brand that makes footwear certified to that class. The Honest Verdict S6 and S7 are a genuine improvement to safety footwear labelling. They take whole-shoe waterproofing out of the small print and give it a clear place on the rating ladder, and the stricter WR test means the claim carries more weight than it used to. The practical advice is unchanged though: match the rating to the actual hazard. If your feet get properly wet at work, S6 or S7 is worth the money and the reduced breathability. If they don't, you'll likely be more comfortable in footwear designed to let air through, and your employer's PPE requirement decides either way. Working Indoors, Where S1P Is Accepted? If your workplace accepts S1P footwear and wet conditions aren't part of your day, we'd like you to try Xnexz PulseX or StrideX on a real shift. Tell us honestly how the fit, comfort and style feel, and what we should improve next. Explore Xnexz PulseX
