Composition: Polyamide Lycra.The cap isn't waterproof but is excellent for minimizing drag, safeguarding your hair, stopping hair from falling into the pool, and preventing hair from obstructing your vision while swimming.It comes in a universal size, featuring excellent elasticity for an ideal fit on your head, making it very easy to put on and remove.It's lightweight and durable, making it suitable for various water activities at the beach or swimming pool, even for indoor hydrotherapy.With exceptional inclusivity.For those with long hair, choose a comfortable option. We have a variety of swim caps available in our store; simply click on "by Medifier" above and look for swim caps.