The Thermos 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, simply empty the water and fill with your favorite beverage. Attaching the lid will further increase the thermal efficiency. The FUNtainer Straw Bottle is made of BPA-free materials and is backed by a five-year limited warranty.