VACUUM INSULATED THERMOS vacuum insulation technology for maximum temperature retention. IT'S ALL IN THE DETAILS Highly functional, beautifully designed, built to keep up with life. PEACE OF MIND We build the gear you trust, love and reach for - and we have since 1904. An ideal choice for people on the go, the THERMOS Stainless King Vacuum Insulated Travel Tumbler is built to last and loaded with features to make for a more enjoyable drinking experience. THERMOS vacuum insulation technology virtually eliminates temperature change within the beverage container by creating an airless space between two stainless steel walls. The result is a superior insulated container you can depend on to keep your beverages hotter, colder, fresher, longer. This travel tumbler keeps beverages hot for 5 hours or cold for 9, making it a great choice for long days out and about or in the office. Constructed with double wall stainless steel, this 16 ounce travel tumbler is virtually durable, yet its sleek design is both eye-catching and functional. The contoured body shape is easy to grip and fits most automobile cup holders and is single serve compatible. For tea drinkers, a built-in tea hook is just the ticket to brew tea on the go. The tea hook can also accommodate most loose leaf infusers. The Stainless King Travel Tumbler comes equipped with a lid which operates simply by pushing the lever 45 degrees right or left to open and close. Because of the double wall insulation, the stainless steel body stays cool to the touch with hot beverages and condensation-free with cold beverages. In order to maximize the incredible insulation technology, it is recommended to either pre-chill or pre-heat the travel tumbler just prior to use. This can be accomplished by filling the tumbler with cold or hot tap water, attaching the lid and letting it rest for a few minutes. Before you are ready to use, simply empty the water and fill with your favorite beverage. The Stainless King Vacuum Insulated Travel Tumbler is made of BPA-free materials.