Crocodile pants are a kind of clothing made of special fabrics, mostly made of oxygen-proof elastic yarn and superfine nylon yarn, which is a kind of clothing made by imitating the skin structure of sharks. Crocodile pants can reduce the resistance of human body in water because of bionics principle, so they are mostly used in swimsuits. It is a kind of moisture-absorbing and quick-drying fitness material, just like our second muscle skin.