Adventure Tested: Mountain Hardwear Mtn. Speed 32 Sleeping BagChris Brinlee Jr7/14/14 1:38amFiled to: gearmountain hardwearghost whisperermtn speed 32sleeping bagdownreviewtestweightpriceadventure testedIndefinitely Wild402EditPromoteShare to KinjaToggle Conversation toolsGo to permalinkPlanning a fast and light cold weather adventure? The Mountain Hardwear Mtn Speed 32 employs a new type of nylon to become the lightest sleeping bag capable of keeping you warm in freezing weather. AdvertisementWhat's It Supposed to Do? This is a down-filled sleeping bag designed for people who are traveling fast and light in the backcountry during colder temperatures. It was designed in collaboration with Ueli Steck, a world-class speed climber, for use as an emergency bag on his high altitude climbs. Something light enough that it wouldn't slow him down during his fast vertical ascents, but warm enough it could save his life in extreme weather. With its 32° temperature rating, its 15.7 oz weight makes it the lightest full-featured sleeping bag in its class. "Full-featured" means it has a hood, drawstring, zipper and zipper baffle. All the stuff you take for granted that helps a sleeping bag actually keep you warm. The Mtn. Speed's slim shape reduces weight while maintaining comfort and warmth.How's It Supposed To Do It? There are a combination of factors at play that contribute to the Mtn. Speed's amazing warmth-to-weight ratio. First, its shell is made from Mountain Hardwear's revolutionary Ghost Whisperer fabric — the lightest nylon commercially available. Ghost Whisperer fabric is windproof, down-proof, and water resistant. The Mtn. Speed uses 850-fill power, water-resistant down. Additionally, the bag uses a ½-length #3 YKK zipper in order to save weight.ShareTweet Kinja is in read-only mode. We are working to restore service.