Thirst 2 Go sport bottles are designed and tested with durability in mind. Made with the same heat-resistant and tough plastic as industry leading home appliances, Tritan, they can withstand the most grueling conditions from super active lifestyles. The BPA-Free double-walled insulated bottles will keep drinks cold or prevent them from getting warm too quick. Just flip up the spout and the built-in straw will help you hydrate effortlessly so you can get back to what you were doing. Fill them up to 20oz and choose this green one if it's your favorite color!.