Composition shoes
Divided by grade fabrics: leather, cow suede, leather shift film, PU leather.
Leather: leather is really smooth.
Cow suede: the leather is done buffing process is generally used to wear leather is not very good, good to grind to get sick is not a thing, it is actually the dermis.
There is another called "In addition to cow suede," that this is not a cow suede, and vague, many specific types, certainly worse than cow suede.
Shift film leather: the leather scrap is broken up with a polyethylene adhesive, generally thick leather, poor ventilation.
PU leather: leather with which it has nothing to do up.
This upper skin layers, the upper leather + pigskin inside.
