Eco-Friendly Material: Our water bottle caps are made of food grade silicone,not easily deform,clean and durable. Upgraded Splash-Proof Lid System: No splash and no leakage, stronger sealing than general caps, clean and safe, creating a sterile environment for clear water storage. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.