Thermos brand products offer superior cold retention that keeps beverages cool and delicious for hours, and the 16 oz FUNtainer bottle is no exception. 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 childs beverages colder, fresher, longer. This hydration bottle keeps beverages cold up to 12 hours - more than 10 times longer than an ordinary plastic water bottle. Constructed with double-wall stainless steel, this 16 oz straw bottle is virtually unbreakable and built to withstand the demands of everyday use. Featuring a hygienic, push-button lid, this straw bottle is easy to open and drink from. Also included on the lid is an integrated, flip-up carrying loop. The Thermos brand FUNtainer straw bottle comes equipped with a breakaway lid designed to simply snap off if accidentally dropped while the lid is open. The lid can then be easily snapped back into place, making this a great, worry-free choice for parents and kids alike. In order to maximize the incredible insulation technology, it is recommended to pre-chill the bottle just prior to use. This can be accomplished by filling the bottle with cold tap water, attaching the lid, and letting it rest for a few minutes. Before you are ready to use it, simply empty the water and fill it with your favorite beverage. Attaching the lid will further increase the thermal efficiency.