Nike Youth Solid Silicone Youth Silicone Cap Its time to gear up! This cap is made with 100% high-stretch silicone thats 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. Hypoallergenic, high-stretch silicone material fits comfortably.;Textured lining increases grip for a secure fit.;Durable material stands up to regular use in chlorine.