An ideal choice for people on the go, the Thermos stainless steel 16 Ounce 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 18, 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. The Thermos stainless steel 16 Ounce travel tumbler comes equipped with a convenient slide lock lid which is easy to open and clean. Because of the double wall insulation, the stainless steel body stays cool to the touch with hot liquids and sweat-proof with cold. 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.