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Designed to keep a down sleeping bag dry on multi-day trips by preventing body perspiration (up to half a cup a night) from getting trapped in the down, the HVBL can enhance a sleeping system in a number of ways. It reduces dehydration by lowering an individual's perspiration rate once skin senses that it is in a humid environment. It adds warmth to a sleeping bag by trapping an extra air layer and reducing evaporated heat loss (up to 5 degrees). It serves as an emergency bivy when out on an extended day trip or climb. In ideal dry conditions the heat generated by the body will drive the moisture through the down. However, in extremely cold or humid conditions some of this moisture might become trapped in the down and freeze. By using a HVBL the moisture is contained and can be removed by turning the HVBL inside out and shaking off the flakes as the moisture freezes. The HVBL is made from ultra-light Silcoat nylon, has a contoured hood with a draw-string and cordlock to fully contain moisture and reduce liner slippage and has a large foot box ensuring a non-constricting fit. |
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