Combining the thermal properties of an insulated vacuum bottle with the lightweight, flexible features of a plastic bottle, the Polar Bottle is the ideal choice for active people. Simply fill with liquid and ice and hit the trail. For even longer cooling power, fill your Polar Bottle and store it in the freezer before use. Either way, it will keep liquids cold twice as long as conventional water bottles. Double-wall construction provides an insulating thermal layer while a foil layer within the walls reflects solar heat away Just fill up the Polar bottle with water and ice and hit the trail or road Dripless, no-mess valve is easy to clean; simply twist and pull Wide diameter opening ensures easy filling and cleaning; easy-to-grip top and bottom Fits into standard cycle bottle cages 100% BPA free