Material is 100% silicone - Silicone is a very elastic and longlife material. After use, it is recommended to rinse under running clean water and allow to dry thoroughly. This swimming cap does not allow water into the cap so it protects your hair from being wet and especially from chlorine or salt water. The swimming cap is seamless, so it more easily adapts to the shape of your head and fits you better. The cap also provides a better hydrodynamic effect. Designed in universal size for adults.