Nike Swim Unisex Logofetti Silicone Training Cap is ideal for protecting your hair and preventing drag while swimming. It's made from hypoallergenic, high-stretch silicone material. A textured lining allows for a secure fit and durable materials stand up to regular use in chlorinated pools.-HYPOALLERGENIC, HIGH-STRETCH silicone material-TEXTURED LINING increases grip for a secure fit-DURABLE material stands up to regular use in chlorine