· Keeps hair out of the pool. The benefit for the swim caps is that it keeps your hair from the common water of the pool. Caps keep your hair from littering the pool.
· Protects your hair from chlorine. Although your cap doesn’t keep your hair perfectly dry, it does keep most of the chlorine-soaked water from coming into contact with your hair. Chlorine, being a solvent, is not overly awesome for hair.
· Makes you a little more hydrodynamic in the water. This is most relevant to the competition swimmer—swim caps can help you decrease a little bit of drag and resistance in the water. Bigger size swim cap, as covered in the competition caps section, provide a bigger size cap experience that reduce the chlorine in the water.