The Tube Insulator keeps the drinking tube and drinking valve of your Source Hydration Bladder insulated in extremely cold weather. The small pocket at the mouthpiece-end of the insulator is designed to hold a small hand-warmer device. Adding the hand-warmer prevents the drinking valve from freezing. Matches all Source Water Bladders.
Bought it to mainly be used when snowboarding in resorts and Backcountry. No more frozen tubes and valves. The heatpack pocket is a nice thought but never felt the need to use that feature. Would like to instead see something like double insulation so it's all passive insulation with no added waste from supplementary products.
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