When we go to swim, we should select a swim cap. How to choose a swim cap? For professional swimmer, it is better to choose silicone cap, the weight from 51g-55g. It is very tight after you wear it. But it can reduce water resistance when you swim. For amateur, it is better to choose PU or silicone

Wearing a swim (or swimming) cap has various advantages, such as helping to keep some of the heavily chlorinated pool water off your hair, helping to keep your hair out of your face while you swim, and helping to lessen resistance as you swim. From the point of view of the pool owner, it also helps