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The Hot Sac VBL by Western Mountaineering, made here in the USA, is your most important companion for those technical winter trips. A VBL works by stopping heat loss from evaporative cooling. A VBL will also prevent your body vapor from degrading your insulation. This is most important during extended stays inside your bag. Our Hot Sac VBL goes one step further by stopping radiant heat loss with its reflective metal coating. An elastic draw cord at the top of the Hot Sac cinches around your neck to prevent convective heat loss. This proprietary fabric is a new lightweight rip stop. The new Hot Sac weighs only 4.5 ounces and is light enough to carry on day trips as an emergency bivy too. Fits Up to 6'6".
FEATURES of the Western Mountaineering Hot Sac VBL
VBL works by stopping heat loss from evaporative cooling
Rated 4 out of
See what it's like, whatever you do.Great item if you want to burn up in sub-zero weather. Overkill for me with my Western Mountaineering Bristlecone -10 degree bag, but maybe I will change my mind during an exceptionally cold night, when my wife throws me out.
Date published: 2005-11-15
Rated 5 out of
Roasty Toasty - Love it!Great product from a great company. Comfortable, quiet and highly reflective fabric keeps your bag dry and your "sac" warm. Highly recommend as a vapor barrier liner or an emergency bivy. ,,,,BUY IT!
Date published: 2013-12-22
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Is this breathable
Asked by: Bobster
Thanks for the question. Breath-ability wasn't the characteristic that Western Mountaineering had in mind when creating its' HotSac VBL. A VBL works by stopping heat loss from evaporative cooling. The proprietary fabric doesn't allow water or air to pass through, making it ideal in extremely cold conditions where breath-ability would not be a priority.