The pants inside basketball pants are called elastic tights. Basketball pants are professional sports pants worn by basketball players in competitions and training. They are usually made of elastic, breathable, comfortable and protective materials. Pants inside basketball pants, that is, tight elastic pants, are usually called "tight pants" or "compression pants". The main function of tight elastic pants is to provide extra elasticity and tight effect, thus enhancing the explosiveness and flexibility of athletes. These pants are usually made of high elastic fibers, which can provide extra support and compression force, make athletes' muscles more tense, and thus get better performance in sports.