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Paper is still in its collagen fibers in the animal's body when the state (refer to the chemical structure); leather refers to animal skin after the physical and chemical treatment to remove unwanted components in the skin, the collagen fibers in the skin and to chemical changes in the structure which is different from its state when the animals. In addition, the leather soft and easy dry state song, humid conditions are non-perishable, and the skin is raw leather, leather is made ​​from the skins. What shoes fabric shoes mandatory under the new standard, shoes upper leather material is mainly divided into the following categories: the first layer of leather: grain pattern intact, natural texture clearly visible pores and leather. Split leather: Leather production process in cross-section the second layer, there is no grain pattern, but by means of different decorative surfaces create a dummy to simulate grain leather full grain leather. Foil leather: the preformed film adhered to the leather surface finishing leather. Suede: grind the grain fine velvet velvety leather, delicate fluff and looming pores. Suede story: In the two-story leather surface buffing leather. All kinds of leather, it is observed on the leather pores. Imitation leather is mainly pores and floor, can be identified from leather sectional observation. Sheep leather surfaces arranged in a semicircular arc two to four pores, and there is a lot of fuzz around the hole on Sheep leather plate is thin, soft, pores small, oblate, constitute a group made ​​up of several pores arranged hair eyes far apart due to the uneven surface of leather, leather surface appears rough, poor flexibility, generally after repair surface before use. Cattle leather pores small, round, uniform and tight, straight toward the inside than the pores, plump leather surface, the light is high, soft leather board, spinning fine, strong, feel solid and resilient. Buffalo leather, leather surface uneven, some surface roughness, pore bulky than cattle rare, generally do not do it while doing upper leather soles. Horse leather pores oval, large holes than cow leather, leather interior was oblique veins shape, leather surface soft and loose, dark color and luster than cow leather leather letter from the exterior to feel like leather, but no pores, floor non-animal skin, is the use of synthetic knitted processed.
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