Push button lock/unlock for opening the drinking cap. Silicone rubber seals inside lid to prevent leakage. Double-wall construction. Keeps drinks hot for 6 hours and cold for 24 hours. Designed for warm or cold beverages. Easy-to-grip curved body. Manufactured By Leeds. Note: Instructions Included: No Materials: Stainless Steel with Stainless Steel liner Oz Capacity: 17.0