Thermos vacuum insulation technology for maximum temperature retention keeps hot for 7 hours and cold for 18 hours. Durable stainless steel interior and exterior features a DrinkLock sealing lid. 50 years manufacturer guarantee. Note:Please check that the silicone seal is correctly in place. The product may leak if it is overfilled. Please always ensure that enough space is left at the neck of the flask for the stopper to fit securely.Box Contains1 x Thermos Stainless King Travel Tumbler - 470 ml, Matt Black