Fend off frozen drink tubes and help keep liquids cool in hot weather with the Platypus Hydration System Drink Tube Insulator. The smart design offers a completely covered bite valve to keep it clean and protect it from freezing quickly, a reverse coil polyurethane-coated zipper to prevent ice and snow build up, a large zipper pull to easily open with one hand (even with gloves on), and a hook and loop closure shoulder strap attachment to secure to a pack. The Drink Tube Insulator works with all Platypus drink tubes and bite valves. Made in the USA.