Experience maximum temperature retention with Thermos vacuum insulation technology. This 470ml tumbler keeps drinks hot for 7 hours or cold for 18 hours. It features a durable stainless steel interior and exterior, remaining cool to the touch with hot liquids and sweat-proof with cold. The DrinkLock sealing lid prevents leaks. Designed for convenience, it fits most vehicle cup holders and has a built-in tea hook for tea bags and loose leaf infusers. The tumbler is backed by a 50-year manufacturer's guarantee and measures 8.3 x 8.3 x 20.0cm.