The purpose of a swimming cap is to keep the hair contained close to the head and to prevent hair from falling into the water. This cap creates less resistance, making it easier for the swimmer to propel themselves. In winter, it helps keep the head warm.

Although the cap does not keep the hair dry, it minimizes contact with water and protects the hair from chlorinated water. Silicone caps offer advantages as they are flexible and secure. They are also economical and require less maintenance after each workout.