Rubber. Rubber is widly used in the outsole of the aithetlc shoes. It has the advantages of durable, skipproof, flexible, elastic, extensive, stable and proper hardness. But the rubber is weighty and easy to be frosting, nonrecoverable.PU. PU is a kind of macromolecule polyurethane materials Sometimes, it is also used in the outsole of casual shoes. PU is durable, strong hardness, upstanding flexbility and more important, The disadvantage is also outstanding. Strong hydroscopic property, go yellow easily, EVA. Ethylene Vinyl Acetate Copolymer which is usually used in the midsole of the running shoes and casual shoes. EVA is quite lightweight, elastic, flexible and suitable to a variety of climates. Just as the rubber, it is also nonrecoverable and go dirty easily. PHYLON. Phylon is the product of the EVA after the second processing. The midsole of running shoes, tennis shoes and basketball shoes in the world is made of the PHYLON. The upstanding hardness, density, traction and extension make it favorite by the manufacture. Besides, the lightweight and good flexibility could prolong the life of the shoes. Just as a coin has two sides, Phylon is nonrecoverable and easily shrink under high temperature.
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