Rubber outsole: used for various sports. Advantage: the abrasion resistance, prevent slippery, elastic, not break, flexibility is good, good stability, shrinkage
stretches, hardness, flexibility is good. Weakness: the weight is heavier, easy to vomit frost of quality problems), (not corrosion problems). (environmental
PU: macromolecule polyurethane synthetic materials: often used in basketball, air