What material is the sole of sports shoes? Answer briefly.

there are five kinds of soles for sports shoes. The main material is rubber. Basically, cheap sports shoes are all made of this kind. The second is pu polymer material. He wears better than rubber. The third is EVA, which is another polymer material. The fourth is to carry out another polymerization on the basis of EVA material. The fifth is special materials. Shoes made of the latter materials are generally expensive. You can't use such cheap materials as rubber for basketball shoes like NBA.