Here's what other sites are saying:
OspreyG??s Hydraulics Insulated Delivery System is engineered to keep your water flowing in subzero conditions. It retrofits on to any Hydraulics reservoir to create a hydration system that combats the cold temperatures encountered during winter activities. All parts are BPA-free, phthalate-free, lead-free, guaranteed.
- Mountain Gear
Osprey Backpack Accessories Insulated Delivery System 10000644. It insulates from the heat as well as the cold.
Designed to keep water flowing when you're playing hard in subzero conditions, the Osprey Hydraulics Insulated Delivery System retrofits onto any Hydraulics reservoir.
Heat reflective closed cell foam sleeve with a zip bite valve access.
- Summit Hut
The Osprey Hydraulics Insulated Delivery System is a cold weather tubing cover for your Hydraulics Hydration Reservoir. Put the tubing inside the sleeve, then tuck the valve into the zipper-closable portion. Drink when you want, without having to worry about water freezing inside the tube when it's cold out. Features of the Osprey Hydraulics Insulated Delivery System Heat reflective closed cell foam sleeve Osprey's hydraulics insulated delivery system to keep your water flowing in subzero conditions Zippered foam pad for bite valve RetroFits to any hydraulics reservoir