From the manufacturer

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.

Features

• 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

Specifications

• 107 cm x 2 cm x 2 cm
• 90 g
• 90% PP Copolymers,10% Neoprene