The Sirene silicone cap is specifically designed to be super stretchy for fitting over longer air, so whether intensive training or fitness swimming is your game, add some flair to your swim kit with this artful fun swim cap. Material + FitExtra stretchy silicone is a durable swim material that molds to your head’s shape. Its soft feel is easy on hair and protects it from water and chlorine. The sleek surface and tight fit ensure hydrodynamic performance while swimming. PVC free. Extend your swim cap’s lifespan by washing it in fresh water after use and air drying it away from heat sources, such as direct sunlight.