NEW: Insulates to prevent freezing and keeps water cool in the heat. Fend off frozen drink tubes and help keep liquids cool in hot weather with the Drink Tube Insulator. The new 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/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). Works with all Platypus® drink tubes and bite valves.