Keep your water flowing freely, even in the most harsh conditions. The new Crux Thermal Control kit takes insulation to the next level so your tube and valve stay ice-free. Designed for reservoirs with the Quick Link system, this cold-weather accessory will extend the range of use your hydration pack during all outdoor adventures. Insulated Tube: Protects the flow of your fluids in cold conditions Freeze-Proof Valve: Integrated cover keeps ice from forming in bite valve Fits Reservoirs with Quick Link System: Keep your Crux working hard year-round with this easy upgrade