Nike Swim Unisex Big Swoosh Cap protects your hair and scalp from harsh pool chemicals. The swim cap is made from a stretchy silicone material offering a hypoallergenic choice of bathing caps. The material boasts exceptional resistance to chlorine, and it has a textured lining for extra grip. HYPOALLERGENIC, HIGH-STRETCH silicone material;TEXTURED LINING increases grip for a secure fit;DURABLE material stands up to regular use in chlorine