Shoes

Full-Grain: Highest quality, retains natural markings, develops patina, most durable and breathable.
Top-Grain: Second highest quality, top layer removed, more uniform appearance, less durable and breathable than full-grain.
Genuine Leather: Can be any layer, often lower quality, may be treated to resemble higher grades, least durable.
Suede: Leather with a napped finish, soft and comfortable, but less durable and requires more care.
Nubuck: Similar to suede but with a finer nap, softer and more luxurious, but also more delicate.
Exotic Leathers: Ostrich, crocodile, etc., unique characteristics and high price points.
Calfskin: Soft, supple, and breathable, commonly used for high-quality shoes.
Sheepskin: Warm and comfortable, often used for winter boots or slippers.
Pigskin: Durable and moisture-wicking, a more affordable option.