Leather (overview)
Animal hide made durable and rot-resistant by tanning. Most clothing and shoe leather is cow or calf; sheep, lamb, goat and deer are lighter and softer. The cut of the hide (grain) and the tanning method matter more for quality than the animal alone.
How it’s made
- 1Hides, mostly a by-product of the meat industry, are preserved (salted or chilled) and sent to a tannery.
- 2Beamhouse: hair, flesh and fat are removed; thick hides are often split into a grain layer (outer surface) and a split layer (underneath).
- 3Tanning stabilises the collagen: chrome tanning (chromium(III) salts, the most common), vegetable tanning (plant tannins from bark, wood or fruit) or chrome-free methods such as aldehyde or synthetic tannins.
- 4Retanned, dyed, fat-liquored for softness, dried and finished (from none for aniline leather to pigment coatings and embossing for corrected grain).
What to look for
- Full-grain: the complete outer surface with natural marks; ages into a patina and is the most durable.
- Top-grain: lightly sanded to remove blemishes; more uniform, slightly less breathable and durable. Usage of the term varies between brands.
- Corrected or embossed grain: heavily sanded and coated, often with an artificial grain print. Looks even but can crack rather than age.
- Split leather: the lower layer, used for suede or coated to look like grain leather. Cheaper and weaker.
- Shoes: calf for smooth dress shoes, a stitched (Goodyear or similar) construction if you want to resole; jackets: lamb or goat nappa for softness, cowhide or horsehide for toughness.
- 'Genuine leather' and 'Italian leather' say nothing about grade. Ask for the grain and tannage.
Pros
- Very durable when well made
- Breathes and moulds to the wearer
- Repairable and can last decades
Cons
- Expensive
- Sensitive to water stains and heat
- Animal origin; tanning can be polluting
Typical use
- Running:
- Not used in running shoes beyond small trims; too heavy and slow to dry.
- Streetwear:
- Shoes and boots, jackets, belts, bags.
Sustainability
Debated. Industry bodies argue leather uses a waste stream from meat production; critics argue it is a co-product that shares livestock emissions and deforestation risk. Chrome tanning effluent has caused serious pollution where wastewater is poorly treated. Vegetable and chrome-free tannages avoid chromium but aren't automatically lower impact. Leather Working Group (LWG) audits rate tanneries on environmental performance; traceability back to farms is still limited.