Fits Drinkware with Different Capacity: The lid is designed to fit SUNWILL 20oz/24oz travel tumblers. Please do not try to use it on any other cups. Some customers have tried to do this but it didn't fit in the end. Premium Material & BPA Free: The silicone sliding lid designed for 20/24oz vacuum insulated stainless steel tumblers. It is made from premium clear raw material, BPA free, easy to clean, dishwasher safe and durable. 100% Spill Proof & Splash Resistant: The silicone part improves spill proof and splash resistant function, keeping your drinks on lock. The silica O-ring is leak proof, while the sliding cover is to add barrier for prevent the temperature escaping. Perfect option for on the go tumblers. Straw Friendly: The drinking hole is wide mouth designed for direct sipping, fits stainless steel straight and bent straws. Lifetime Customer Service: We provide limited lifetime warranty to ensure you 100% satisfaction with the purchasing. Features: Silicone sliding cover lids for 20oz travel tumblers. 100% spill proof and splash resistant. BPA free and completely food safe. Easy to open and close sliding cover, straw friendly and keep your drinks cold or hot longer. Great mate to you on-the-go tumblers, car mugs. To apply the lid to your tumbler and make your drinks with you everywhere. Specification: Lid Material: AS, Silicone Color: Clear Quantity: 2pc Helpful Hints: The lid is designed for SUNWILL product. Please check the size if you would buy for cups of other brand. Wash with non-scratch sponges or cloth, dishwasher safe. Do not put in microwave. The air hole on the lid is designed to keep a same air pressure inside and outside the tumbler, making it convenient for you to drink water. The sliding cover for the drinking hold is to add barrier to keep temperature, prevent drinks pouring when the tumbler spill/splash accidently. However, it is not guaranteed 100% leak proof if the tumbler inverts for a long time.