A cool drink of water provides such a relief on warm days and with the Polar Insulated Water Bottle your 20oz of fluids will remain cool for twice as long as a regular water bottle. Its double-wall construction, replete with an inner foil liner, is optimized to keep heat out and cold in - exactly what you need to keep your drink cool as the temperature rises. This version of the Insulated Sport bottle holds 20oz of liquid, is made in the USA, and is BPA and Phthalate free.