Shoe Materials Explained: What Shoes Are Made Of and How to Tell Them Apart

A shoe looks like one object, but it is closer to a small engineering project. MIT researchers who studied a typical running shoe counted 65 separate parts and more than 360 processing steps to put them together [1]. Each part is chosen for a different job. Leather or mesh for the upper, foam for cushioning, rubber for grip, a stiff counter to hold your heel in place.

That is why “what is this shoe made of?” rarely has a one-word answer. In my years of shoe retail, the most common question I heard wasn’t about brand or price. It was some version of “will this last, and how do I look after it?” Both answers come down to materials. This guide is the hub for every material article on Urban Style Footwear. Start here, then go deeper with the links in each section.

What are shoes made of? A part-by-part breakdown

Think of a shoe in layers, from the outside in and the top down. Every layer has its own typical materials, and the label laws in Europe and the UK only ask brands to name three of them: the upper, the lining and sock, and the outer sole [2]. For a full tour of the parts, see our anatomy of a shoe guide.

Shoe materials by the numbers

Most material guides skip the data. Here is what the industry figures actually say, with the source for each one.

One thing stands out. Leather is now a minority material by pair count. A UN report noted that 2008 was the first year that less than half of all footwear was made of leather [5]. Synthetics, textiles and molded rubber took over the volume end of the market, while leather kept the premium end. That split explains a lot of what you see on shelves.

The 5 shoe material families

Every material in this guide fits one of five families. Each card gives you the short version and links to the full article.

Shoe material comparison table

This table compares the upper materials you will meet most often. The ratings are relative and come from how each material is built: grain structure, weave density, coatings. They are not a lab score. A cheap pair in a good material can still fail early if the stitching or glue is poor.

Rule of thumb from the table: the more a surface is coated, the more water it keeps out and the less sweat it lets escape. That trade-off runs through every material on this page.

What actually wears out first (with evidence)

Most guides answer “what is the most durable shoe material?” with “leather” and move on. That is only half the story. In real use, shoes rarely fail in the upper first. They fail in the foam, the glue line or the sole. Here is what the research and testing bodies show.

1. Foam midsoles flatten long before they look worn

In a University of Birmingham study published in the Journal of Biomechanics, peak pressure under runners’ feet rose by an average of about 100% after a 500 km run in EVA-midsole shoes. Electron microscope scans showed damage to the foam cells after 750 km [7]. A 2020 study of 33 runners in the same shoe model found midfoot peak pressure climbed from about 387 kPa when new to about 590 kPa at 700 km [8]. The uppers looked fine. The cushioning had gone. Our guide on how long running shoes last covers what that means for replacing them.

2. PU soles can crumble even if you never wear them

Polyurethane reacts with moisture in normal air over time (hydrolysis). SATRA, the UK footwear research and testing body, says three years is a reasonable expectation before PU footwear may be affected, especially if it has been wet. It describes this as an effective “use by” date that starts when the sole is molded, not when you buy it [9]. One safety footwear maker states its basic PU sole lasts about 1.5 years in tropical conditions and 3 years in normal conditions [10].

Real owners report the same thing. On the MoneySavingExpert forum, buyers describe hiking boots crumbling after little wear and a pair that “crumbled to nothing in the box” while stored unused [11]. If you buy shoes to keep for “best”, store them cool, dry and ventilated, and wear them now and then. More in our guide to midsole hydrolysis.

3. Synthetic leather tends to fail at the surface

PU synthetic leather is a plastic coating on a fabric backing. When it fails, it usually cracks at the flex line or peels where the coating separates from the backing. Real leather creases but does not delaminate. That is why “PU leather peeling” is one of the most common complaints about budget shoes. See how to fix peeling shoes for what can and cannot be saved.

4. Textiles wear through at the toe and heel

Mesh and knit uppers give up where they rub: the big toe area and the inside heel lining. A hole in the heel lining is usually a fit or heel counter issue, not just weak fabric. Our guide to fixing holes in shoes explains both.

So what lasts longest?

A full grain leather upper on a stitched sole you can replace. A Goodyear welted boot can be resoled several times, so the long-life part (the upper) outlives the short-life part (the sole). For athletic shoes, the honest answer is different. The midsole sets the lifespan, so pick the foam and outsole rubber for your mileage rather than the upper.

How to identify what your shoe is made of

You do not need a lab. Work through these checks in order and you will get it right almost every time. Our dedicated guide shows each one with photos: how to tell if shoes are real leather.

1. Read the label first. Look inside the tongue, on the heel lining or under the insole. In the EU and UK you will find pictograms for the upper, lining and sole. US labels often use words like “leather upper”, “man-made materials” or “synthetic”.
2. Look at a cut edge. Real leather shows a fuzzy, fibrous edge. Synthetic leather shows a fabric backing or a smooth, uniform plastic edge. Check inside the collar or around the eyelets.
3. Check the grain. Full grain leather has small, uneven pores and natural marks. A perfectly regular pattern usually means embossed corrected leather or a synthetic.
4. Press and flex. Leather wrinkles into fine, irregular creases and slowly recovers. PU often forms sharper, regular creases that stay.
5. Smell it. Leather has an earthy smell. Synthetics smell of plastic or chemicals, especially when new.
6. Do a drop of water test on a hidden spot. Untreated leather and suede darken as they absorb a drop. PVC and coated surfaces bead it off. Dab it dry straight away.
7. Compare price and claims. A “full grain leather” shoe at a fast-fashion price deserves a second look. Do not use the burn test you see online. It damages the shoe and is unsafe.

Shoe labels and symbols decoded

This is where most guides are vague. Here is exactly what the rules say in the two places most of our readers buy from.

EU and UK: four material symbols, three shoe parts

EU Directive 94/11/EC, and the UK’s Footwear (Indication of Composition) Labelling Regulations 1995, require shoes to show the main material of the upper, the lining and sock, and the outer sole. Brands may use words or pictograms [2] [12].

United States: leather claims are policed, fabric content is not

The US has no pictogram system for shoes. Two federal rules matter instead:

• FTC Leather Guides (16 CFR Part 24) list footwear as a covered product. If a part looks like leather but is not, that should be disclosed, for example “imitation leather”, “simulated leather” or “vinyl”. Ground or bonded leather should not be called leather without disclosing the percentage of leather fiber and non-leather content [13].
• Textile Fiber Products Identification Act. Footwear is not on the list of products the textile labelling rules cover (16 CFR 303.45). That is why American sneaker labels rarely give fiber percentages [14].

So what does “man-made materials” mean on a US shoe? It is a catch-all for synthetics: PU or PVC coatings, polyester mesh, nylon and plastic overlays. It is not a quality grade. Treat it as “not leather, not natural fiber” and look at the product photos and description for the details.

Which shoe material should you choose?

Start from your situation, not the material. This is the table I would use at the fitting stool.

Material certifications worth looking for

Most shoe material guides skip the certification logos on shoe boxes, even though they tell you more than any marketing line. Here are the ones that matter most for footwear.

A certification covers a material or a site. It does not tell you how long the shoe will last. For sustainability claims that sound too good, read our guide to spotting greenwashing in footwear.

How to care for each shoe material

For a full routine across every material, see our shoe care and cleaning guide.

5 shoe material myths

Myth 1: “Genuine leather” means top quality

It means the product contains real leather. In practice it is often a lower layer of the hide, below full grain and top grain. Our full grain vs top grain guide shows the full ladder.

Myth 2: Synthetic always means cheap and bad

A good microfiber upper can outlast a poor corrected leather one, and engineered mesh outperforms leather for running. The quality of the build matters as much as the material.

Myth 3: Shoes last forever if you do not wear them

PU soles and some foams age with time and humidity, worn or not [9]. Storage conditions matter more than mileage for these.

Myth 4: Waterproof is always better

Membranes keep rain out but also slow down sweat escaping. In warm, dry weather a breathable mesh shoe is more comfortable. See what is Gore-Tex.

Myth 5: Leather is the most eco-friendly choice because it is natural

Every material has a footprint. MIT found most of a running shoe’s emissions come from manufacturing energy rather than the raw material itself [1]. Wearing a pair longer is usually the biggest win. Read more in our sustainable shoes guide.

Shoe materials FAQ

Every shoe material guide on Urban Style Footwear

Related hubs: running shoe foam, anatomy of a shoe, shoe care and cleaning, shoe style guide.

Sources

1. MIT News Office, “Study finds the bulk of shoes’ carbon footprint comes from manufacturing processes” (2013), on the lifecycle study by Kirchain, Olivetti and colleagues in the Journal of Cleaner Production.
2. Directive 94/11/EC on labelling of the materials used in the main components of footwear, legislation.gov.uk.
3. World Footwear, “24.6 billion pairs: global footwear production in 2025”, World Footwear Yearbook 2026 (APICCAPS), August 2026.
4. World Footwear, “Leather footwear leads exports in value, but rubber and plastic leads in volume”, World Footwear Yearbook (2023 data), September 2024.
5. UNIDO, Future Trends in the World Leather and Leather Products Industry and Trade (2010).
6. Leather Working Group, official site.
7. Verdejo, R. and Mills, N.J., “Heel-shoe interactions and the durability of EVA foam running-shoe midsoles”, Journal of Biomechanics 37 (2004) 1379 to 1386.
8. Escamilla-Martinez, E. et al., “Longitudinal Analysis of Plantar Pressures with Wear of a Running Shoe”, International Journal of Environmental Research and Public Health (2020).
9. SATRA, “Learning from footwear failures”.
10. Safety Jogger, “Hydrolysis, the crumbling of shoe soles explained” (manufacturer data).
11. MoneySavingExpert Forum, “Crumbling shoe / boot soles, sole hydrolysis” (owner reports, January 2024).
12. Business Companion (UK trading standards), “Labelling of footwear”.
13. eCFR, 16 CFR Part 24, Guides for Select Leather and Imitation Leather Products.
14. eCFR, 16 CFR 303.45, Coverage and exclusions from the Textile Act.

How this guide was made: I wrote it from years of hands-on shoe retail experience, current industry data, peer-reviewed research and the labelling laws themselves. Durability ratings in the comparison table are editorial and explained above. We update this page when new data or rules come out. Last reviewed October 19, 2026.