Polar Bottle created the Insulated Sport series of bottles to keep your cold water colder for twice as long. The bottles use a reflective foil layer between the inner and outer bottle to keep water cold (or warm). This extra insulation is paired with a durable, squeezable bottle for active hydration. The lid features either a Sport Cap or a high flow ZipStream cap, and the bottle is BPA- and pthalate-free. The Insulated Sport bottle is offered in many colors and patterns, and in three main sizes.