Used by the world's best swimmers, the arena x TheSwimsuitGuy 3d Soft Cap this is the ultimate cap for everyone out there who wants to swim FAST. It is wrinkle-free, comfortable, and hydrodynamic, making it the ultimate cap for both training and racing.

The cap comes in a size L which is suitable for 90% of people out there. I don't know anyone personally who would want a M (there is no S).