Why the material list is short on purpose
Walk a factory showroom and the material options multiply without end; read a working stock list and the vocabulary collapses to a handful. The desk's list is the short version, because the short version is what actually gets bought and sold at volume: five upper materials - engineered mesh, knit, PU leather, split leather and suede - and three outsole families - rubber, EVA-blend and foam. Every model on the stock list and every spec sheet the desk quotes is described in these terms. That is deliberate. A buyer who can read these eight names can compare any two programs the desk quotes, and a spec sheet written in this vocabulary can be checked, sampled and labeled without translation problems later.
Upper materials
| Material | Where it appears | Buyer notes |
|---|---|---|
| Engineered mesh | Runners, trail-style builds | Open weave for airflow; structure comes from overlays, not the mesh itself |
| Knit | Everyday and women's builds | Stretch and softness at the forefoot; holds shape via the heel counter |
| PU leather | Court-inspired trainers, slip-ons | Wipes clean, photographs well, consistent from pair to pair |
| Split leather | Casual leather sneakers | Real leather split from the hide; dresses a range up, needs care notes |
| Suede | Retro runners, panel overlays | Texture that reads as design; protected against scuffs and weather |
Two honest notes belong next to that table. First, "leather" on a spec sheet means exactly what it says: split leather is genuine leather, the corium layer split from the hide, and PU leather is a synthetic - the two belong in different sentences and different labeling. Second, mixes are the norm, not the exception: a single upper routinely combines mesh base panels with PU or suede overlays, and the spec sheet lists the material per panel. The trade-offs between leather and synthetic uppers are compared in the leather vs synthetic note, the mesh family in the mesh uppers note, and the whole stack, insole to laces, in the full materials explainer.
Outsole and midsole materials
Underneath, the working vocabulary is three families. Rubber is the outsole material - grip, abrasion resistance and the part that touches the ground; pattern and thickness are spec items, as the outsole comparison in the rubber vs EVA note sets out. Foam is the midsole material - the cushioned layer between upper and outsole; factories may name their foam systems differently, and the desk describes it generically as a foam midsole with the exact compound confirmed on the spec sheet. EVA-blend covers the light, molded sole units - common on sandals and lighter casual builds - where EVA is blended for durability rather than pure foam weight. A casual sneaker typically pairs the three: foam midsole, rubber outsole, and a heel or toe section where the compounds meet, assembled by lasting and cementing - the process flow documented on the production process page.
Honest labeling: what the destination market requires
Material names are not only a product decision; they are a legal one at the border. For the United States, the FTC's shoe content rules (16 CFR Part 300) require labels to disclose the material of the upper, the lining and the outer sole - by percentage where textile - along with the country of origin. Two details trip buyers up: the general textile-fiber labeling law does not apply to footwear, the shoe-specific rules do; and the disclosure covers three parts of the shoe, not just the visible upper. The desk writes the material stack on every spec sheet in a form that maps to those disclosures, and the labeling picture in full sits on the compliance page and in the US labeling rules note.
The same honesty applies to claims the desk does not make. Material test reports and certifications such as OEKO-TEX are verified by certificate or report number, per program, when a program requires them - the desk never claims to hold certificates, and buyers should treat any supplier certificate as a document to check, not a sentence to repeat. The vegan question gets the same treatment: a synthetic upper is not automatically a certified vegan product, and the difference is set out in the vegan materials note.
Care instructions follow the material
Material choice writes the care copy, so choose it with the aftercare in mind. Mesh and knit uppers want cool water and air drying; heat and stiff brushes deform the weave and the foam beneath it. PU leather wants a damp cloth and nothing abrasive - the surface cleans easily, but punctures are permanent. Split leather and suede want the full routine: dry brush, protective spray applied before first wear, and stain treatment matched to the finish, or the care story becomes the returns story. Writing care instructions per material into the product page - and into marketplace listing copy - is a half-hour job at the spec stage and a standing defense of the margin afterwards. On OEM programs the care copy belongs in the packing section of the spec sheet, because the insert card in the box is where care instructions actually reach the customer.
Choosing materials for a program
The desk's working advice, route by route. On stock, read the material line on the live list and match it to your channel: mesh and knit builds for comfort-led listings, PU and split leather for the cleaner, more dressed end, suede where texture sells. On OEM, choose the material per panel at the development stage, because the choice drives cost, weight, care instructions and labeling at once - a material changed after sampling re-runs all four. Either way, the material stack ends up in writing on the spec sheet, which is the document your labels, your product pages and your customs broker will all read from. Bring the channel and the market, and the desk will propose a stack to match on the request form.