The Travel Bottle is designed to keep cold drinks fresh. For the best results, add some icethe vacuum-insulated double-wall construction will do the rest. Its a great choice for long car or train trips, the gym, or even a sauna visit! As with all Hydroflask products, the Travel Bottle is made from high-quality stainless steel. It wont transfer odors or flavors to your drink, and no part of the product contains BPA. The bottle features a Flex Straw Cap for easy sipping. The wide-mouth opening is also compatible with other Hydroflask Widemouth caps. Note that the Flex Straw Cap is not intended for hot beverages. - Vacuum-insulated walls (TempShield construction) - Keeps drinks fresh for 24 hours - Ergonomic design - Dishwasher safe - Leak-proof cap