Nike Swim Unisex Shift Silicone Training Cap is made from durable hypoallergenic, high-stretch silicone material. A textured lining provides a secure grip so the cap won't slip while swimming. Protect your hair and prevent drag while training with this swimming cap.-HYPOALLERGENIC, HIGH-STRETCH silicone material-TEXTURED LINING increases grip for a secure fit-DURABLE material stands up to regular use in chlorine