Kanaloa Charity Cap 100% Silicone Swim Cap! 100% Silicone construction provides complete water protection! Smooth finish for minimum drag; Swim faster and longer than your competition! Only the highest quality material is used for Kanaloa swim caps. The caps are stretch tested to a stretch length of five feet! As with all Kanaloa products, 10% of our profits are donated to Charity Water to bring clean, drinkable water to the world. Simple cleaning: Turn inside out and spray down. The silicone will rinse clean and stay fresh for years!