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The Western Mountaineering Hot Sac VBL is a sleeping bag liner to increase the warmth of your winter bag on the frostier winter trips. At just 4.5 ounces of weight, cold weather expeditions can hardly go without one of these puppies. It fits on the inside of your sleeping bag, up to 6'6" of length. The ripstop nylon face fabric plays nice against the inside of your bag, while the reflective metal coating on the inside stops heat loss from evaporative cooling. Whoa, science, I almost can't handle it.
FEATURES of the Western Mountaineering Hot Sac VBL
VBL works by stopping heat loss from evaporative cooling
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
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 2 out of
Too narrowUsed it for the first time last night and found it kind of confining and difficult to turn over in. Not sure about durability yet. But it did seem to keep me warming.
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.