Mesh vs Leather Upper: Which Is Better for Safety Shoes?

Upper material is one of the most overlooked decisions in safety shoe selection. Most workers focus on the toe cap, midsole, and outsole, the protection stack, while the upper gets chosen by default based on how the shoe looks.

That is a missed opportunity. The upper material directly affects breathability, foot temperature, moisture management, and how the shoe ages across months of daily wear.

What Is a Mesh Upper in Safety Shoes?

A mesh upper is a woven or knitted synthetic fabric that forms the body of the shoe above the sole. In safety trainers, it's almost always paired with microfibre panels at the toe box and heel for abrasion resistance, and a KPU-coated backing layer for structure, without closing off the breathability the mesh provides.

The core function is airflow. The open weave lets heat and moisture escape the foot continuously throughout a shift, which no closed upper material, leather included, can match.

Both Xnexz models, the PulseX and StrideX, use a breathable mesh and microfibre upper with a KPU-coated backing layer. The construction provides the trainer-style fit and breathability that makes these shoes viable for workers on their feet 8–12 hours a day. For a detailed breakdown of how this construction works in practice, see our article on what a mesh upper does in safety shoes.

What Is a Leather Upper in Safety Shoes?

Leather uppers come in three common forms: full-grain (outermost hide layer, most durable, naturally water-resistant), split suede (lower layer, softer, wears faster), and nubuck (buffed full-grain with a matte finish). Each sits on the same material; what differs is which layer of the hide it comes from and how that affects surface durability.

What they share is density. The tightly packed collagen fibres in leather create a solid barrier, resistant to liquid penetration, surface abrasion, and cuts in a way no open-weave textile can match. That same density is what limits breathability: air does not pass through a hide the way it does through mesh.

It's why leather dominated safety footwear for decades, and still leads in construction, heavy industrial, and S3-rated boots where the upper needs to hold its own against the environment.

Breathability: Why Airflow Matters Across an 8-Hour Shift

The average foot produces 200–400 mL of perspiration per day at moderate activity, more during an active 8–10 hour shift. In a non-breathable shoe, that moisture has nowhere to go.

Mesh uppers solve this directly. The open weave allows continuous air exchange: heat and moisture out, cooler air in. Foot temperature stays lower and more stable across the full shift. At 10,000+ steps a day, the difference between a vented and an enclosed shoe compounds with every hour.

Leather doesn't offer the same exchange. Some airflow comes through the tongue and collar, but the hide itself is a barrier, which is also what makes it durable. The consequence in long shifts is higher foot temperature, greater moisture buildup, and the downstream effects: blistering, skin softening, and fatigue that sets in well before the shift ends. For the full picture, read our article on what happens to your feet after 10 hours on site.

Mesh vs Leather Upper: Properties Compared

Properties vary by specific material grade and construction quality. Full-grain leather outperforms split suede on most durability metrics.

Five Key Properties: How Mesh and Leather Score

The following comparison illustrates how mesh and leather uppers perform across five properties that matter most in a daily safety shoe context. Scores are on a 1–10 scale and are illustrative of the general material difference, not a specific product test result.

Weight: How Upper Material Affects Every Step of Your Shift

A full-grain leather upper adds roughly 150–250 g over an equivalent mesh construction, a 20–30% difference in upper weight alone on a typical safety shoe.

That compounds fast. At 10,000 steps per shift, 150 g of extra weight per foot means approximately 1,500 kg of additional accumulated load each day. Over a five-day week, that's 7,500 kg per foot, from the upper material alone.

For workers managing lower-limb fatigue or joint strain, it's not a small detail. Our article on the hidden cost of heavy safety shoes on long shifts examines this in detail.

Durability: Which Upper Actually Lasts Longer?

Leather lasts longer, typically 12–36 months with correct maintenance versus 6–12 months for mesh under comparable daily use. The hide is denser, resists abrasion, and holds its structure through scuffs and flex that would degrade a textile construction significantly faster.

Mesh degrades under abrasion. The same open weave that ventilates the foot is vulnerable to snagging, tearing, and surface wear. Microfibre reinforcement at the toe box and heel helps, but mesh is not built for environments where the upper takes regular physical punishment.

The qualifier is environment. In a warehouse, depot, hospital, or kitchen, a mesh upper rarely encounters the abrasion that shortens its life, and in those settings, 12 months of daily use is a reasonable expectation. In construction, demolition, or agricultural work, the abrasion and moisture load is beyond what mesh was designed for. That's where leather's durability advantage stops being a preference and becomes the practical requirement.

Where Leather Uppers Perform Best

Leather uppers are the stronger choice when the working environment introduces physical hazards to the upper of the shoe itself, not just the sole:

- Construction and demolition sites with sharp debris, concrete rubble, and scuffing surfaces.

- Agricultural environments with prolonged exposure to mud, wet grass, and abrasive organic material.

- Outdoor utility and groundworks roles where the upper faces sustained water, soil, and debris contact.

- Waste management and recycling environments where rough material contact with the upper is routine.

- S3-rated environments where the standard mandates water-penetration resistance, which leather naturally provides.

- Cold, wet outdoor environments where moisture ingress to the upper is the primary daily comfort risk.

In these settings, the physical barrier properties of leather, its resistance to cuts, scuffs, water penetration, and surface abrasion, directly address the actual hazards the upper faces during a working day.

A mesh upper in the same environment would degrade rapidly and provide inadequate protection against the upper's daily load of physical contact.

Water Resistance: The Most Common Misunderstanding

Safety shoes are not automatically waterproof, and mesh uppers are not waterproof even with a KPU backing layer.

KPU backing handles light splash. It does not seal the upper against standing water, prolonged rain, or muddy terrain. In genuinely wet outdoor environments, moisture will get through mesh over time. Full-grain leather, maintained with a waterproofing treatment, is the more reliable choice for sustained wet exposure.

If water resistance is a requirement for your role, look for the EN ISO 20345 WPA marking, the specific test for upper water penetration and absorption resistance. The marking confirms the shoe passed that test; the upper material tells you how long that performance holds up in daily use.

Maintenance Over the Product's Life

Leather needs conditioning every four to eight weeks, more if it gets wet regularly. Without it, the natural oils deplete, the hide dries out, and cracking starts at the toe box and ankle flex points. Once cracked, both structure and water resistance are gone. Clean with a damp cloth or soft brush; dry away from direct heat; store cool and dry.

Mesh needs a wipe down. No conditioning, no cracking risk. The tradeoff: staining is harder to reverse on lighter panels, and abrasion damage is permanent, leather can often be polished back; mesh cannot.

Does Upper Material Affect EN ISO 20345 S1P Certification?

No. EN ISO 20345:2022 S1P certification does not specify an upper material. The standard tests the shoe as a complete system against a defined set of performance requirements: toe impact protection (200J), toe compression resistance (15kN), anti-static properties, heel energy absorption, and, for S1P specifically, puncture resistance. The upper material is not a factor in these core S1P tests.

Where upper material becomes relevant to certification is in specific optional markings that a shoe may additionally carry. The WPA marking (water penetration and absorption resistance of the upper) requires a specific test of the upper under water pressure. A leather upper is more likely to achieve this marking than a standard mesh upper; a mesh upper may achieve it with specific waterproof membrane layers, but this depends on the construction.

Both Xnexz models, PulseX and StrideX, use a mesh and microfibre upper and carry EN ISO 20345:2022 S1P certification. Neither is rated for environments requiring waterproof upper construction. To understand the full range of EN ISO 20345 rating requirements and how they map to your role, our buying safety shoes UK checklist covers all the key questions to work through before purchasing.

Mesh or Leather: Which Upper Should You Choose?

The decision should follow from your work environment, not from personal preference or assumption about which material is "higher quality." Both are used in certified safety footwear; each is better suited to a different set of working conditions.

If your employer's risk assessment specifies a particular upper material or certification level, that requirement takes precedence over personal preference. Always confirm the correct upper material for your role with your safety officer or employer before purchasing, especially if you are transitioning from a leather boot to a mesh safety trainer, which represents a meaningful change in the upper's physical barrier properties.

The Verdict

Mesh wins on breathability, weight, and thermal comfort across a long indoor shift. Leather wins on abrasion resistance, water exclusion, and structural longevity in outdoor or abrasive environments.

This isn't better vs worse, it's right for your environment vs wrong for it. An S1P mesh trainer and an S1P leather boot carry identical mandatory protection: the same 200J toe impact test, the same puncture resistance, the same anti-static and heel energy absorption requirements. The upper material only changes what the shoe does above the sole.

Choose mesh for long indoor shifts where heat and fatigue are the daily problem. Choose leather where the upper faces water, debris, or abrasion a textile wasn't built to handle. Either way, confirm the correct EN ISO 20345 certification level for your role and that your employer's risk assessment approves the upper type.

Xnexz uses mesh and microfibre because our shoes were designed for warehouse, logistics, healthcare, and hospitality, environments where breathability and light weight serve workers best. If your experience on a real shift tells you something different, we want to hear it.