Why then Wear a Swim Cap?
Nevertheless, there are several reasons why wearing a swim cap makes sense. A swim cap:
Protects your hair from the chlorine in swimming pools.
Keeps long hair out of the face.
Keeps your head warm when swimming in cold or open water (if using a neoprene cap).
Makes the swimmer more visible in open water, especially if there is a risk of collision with boats, surfers, etc.
Is mandatory in many swimming pools to avoid that the water filters become clogged with hair (if you are bald you may be exempted from this obligation).
Allows you to swim a bit faster, which is important in competitions. There are even competitive swimmers who wear two swim caps one on top of the other: one swim cap to cover the hair, then another one above the strap of the swim goggles to keep them in place and to further reduce drag.