Genuine leather is mainly processed from animal skin fabrics. Currently, the most popular genuine leather on the market are divided into the dermis layer of skin (Nappa Leather) first and second layer of skin. First layer is closest to the surface, less disability from the finest raw hide of work, the natural leather surface of the well-preserved state, the coating is thin, can show a pattern of animal skins natural beauty, it is not only wear ,but also has good air permeability, is the presence in the upper dermis. The second layer of skin is relatively loose fibrous tissue layer part, by spraying chemicals or covered with PVC, PU film processed, its fastness to wear less, is kind of cheaper leather. In addition to the second floor there are three outer skins; three skins is the worst animal leather.