1. Rubber: used in various sports shoes outsole. Advantages: good wear resistance, non-slip, elastic, not easy to break, good softness, good ductility, stable shrinkage, good hardness and good bendability. Disadvantages: heavy weight, easy to spit cream (quality problem), not easy to corrode (environmental problems)
2. PU: Often used for basketball and tennis shoes midsole, and can also be used directly on the outsole of casual shoes. Advantages: high density, high hardness, good wear resistance, good elasticity, good oxidation resistance, easy corrosion, environmental protection, and not easy to wrinkle. Disadvantages: strong water absorption, easy yellowing, easy to break, poor elongation, water resistance, and perishable bottom.