Leather is divided into leather, rawhide and leather. First, the dermis. Leather cattle, sheep, pigs, horses, deer or some other animal skin peeled raw, processed by tanneries tanning, made from a variety of features, strength, feel, color, pattern leather material, modern leather products the necessary materials. Among them, cowhide, sheepskin and pigskin leather materials used are the three major skin types. Dermal layer of skin into the first and second layer of skin types for Asics Kayano 17. (1) The first layer is of a grain of cattle, sheep, pig, etc., have a natural leather bar marks such as scars and blood, occasional stab wound to the processing and utilization of low belly area, imported first layer of skin as well the number of cattle branding. Whole grain dough thickness from the pores and sparse density to distinguish what kind of animal leather. More types of leather such as cow leather, meat, leather, grazing cow, cowhide, leather male, not castrated male and castrated male cow leather. In China there are yellow leather, buffalo, yak skin and Pianniu hides. Among them, the buffalo and the sparse some coarse pores; leather yellow leather, the pores are more water-thin and thick. Fine pores in sheep's clothing is more dense and a little more slope, mainly sheep and goat skin two categories.

The rule is a result of long-haired pig skin 3 to 5 a handful of distribution, it is easy to distinguish the general use of pig skin in captivity, as well as wild boar skin, a famous South American wild boar, wild boar leather that has obvious pig skin pores and grain characteristics, the collagen fibers due to its special structure, can be processed into very soft garment leather or glove leather, high-value.jimmy choo sko , In addition, ostrich skin, crocodile skin, alligator skin, lizard skin, snake, bullfrog skin, sea water fish skin (shark skin, cod skin, Min skin, eel skin, pearl skin, etc. ), fish skin ( There are grass carp, carp and other scaly skin leather), with hair fox (silver fox skin, blue fox, etc. ), weasel, dog, rabbit, etc. are easily identifiable, and can not be made of two skins. First layer of skin from a variety of animal hides processed directly, or thick cortex of cattle, pigs, horses and other animals cross into the skin after hair removal upper and lower levels, the upper part of the fiber are organized into a variety of processing head layer of skin. (2) two loose fibrous tissue layer of skin is part of the story, by chemical spray or covered with material PVC, PU film processed. Therefore, the distinction between first layer and the second floor of an effective method is longitudinal section view of Chapi fiber density. The first layer of skin from the thin, dense fibrous layer and closely linked with its slightly over-layer composed of loose, with good strength, elasticity and plasticity characteristics of technology. Second layer of skin only loose fibrous tissue layer, only after spraying chemicals or polishing can be used to make leather products, it maintains a certain degree of natural elasticity and plasticity characteristics of technology, but the strength is poor, with the first layer of the thickness required skin the same.