Built to hold up when it's time to swim hard, the high-stretch silicone material is durable with a textured lining that stays put. Chlorine-resistant and hypoallergenic, the Nike Swim silicone cap keeps up with you over long miles in the lanes. Features & Design: Textured lining helps increase traction for a secure fit Hypoallergenic, high-stretch silicone material Chlorine resistant