Nike Solid Silicone Swimming Cap. A dependable cap is one piece of gear a swimmer can't live without. This cap is made of tear-resistant silicone for a stay-put fit that does not pinch or squeeze. The signature Nike swoosh rides high in the water. It’s time to gear up! This World Aquatics-approved cap is made with 100% high-stretch silicone that’s hypoallergenic and will hold up against chlorine and wear--swim after swim. A textured lining enhances grip, so you can feel secure as you take the plunge. World Aquatics approved ;Hypoallergenic, high-stretch silicone material fits comfortably.;Textured lining increases grip for a secure fit.;Durable material stands up to regular use in chlorine.