An ideal choice for people on the go, the THERMOS Stainless King Vacuum Insulated Beverage Bottle 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 an insulation layer that performs better than any other. A superior insulated container you can depend on to keep your beverages hotter, colder, fresher, longer. This beverage bottle keeps beverages hot or cold for 24 hours, making it a great choice for wherever life's adventures may take you. Constructed with double wall stainless steel, this 40 ounce beverage bottle is durable, yet its sleek design is both eye-catching and functional. The specially designed twist and pour stopper lets you pour without having to remove the stopper completely. A simple twist is enough to allow liquids to flow out. This beverage bottle comes equipped with its own built-in, insulated stainless steel serving cup, so there is no need to pack an additional cup. The bottle also features a compact, fold-flat handle for easy carrying that also provides increased stability and handling when pouring. Top of the line construction and rubber gaskets keep this bottle leak-proof and 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 beverage bottle just prior to use. This can be accomplished by filling the beverage bottle 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. Attaching the lid will further increase the thermal efficiency. Do not put stopper in boiling water. It will to deformation or leaking