Here's what other sites are saying:
We've made our best sleeping bags even better by using innovative and highly water-repellent DownTek™ 750-fill down that maintains its loft in wet conditions. This down is specially treated with an advanced nano technology that resists moisture, keeping the down lofted enough to trap heat and retain most of its insulating abilities. It also absorbs one-third the moisture and dries two-thirds faster than untreated down, making this sleeping bag a great choice for backcountry trips in damp climates. This special winter bag is designed for backcountry expeditions in cold conditions. Extra length lets you keep your boots and other important items in the foot of the bag to keep them warm during the night. Besides being water resistant, the down features an outstanding warmth-to-weight ratio and is the most durable and long-lasting insulating material available for sleeping bags. A special baffle design keeps more insulation on the top and sides, where you need it most. Hood design provides excellent warmth, range of motion and adjustability. Draft tube on zipper and hood prevents cold air from seeping in. Both exterior and interior shells of the bag are constructed of downproof ripstop nylon that has a soft, silky feel. Water-repellent coating on outer shell. Heavy-duty stuff sack and extra-large storage sack included. Imported. Machine wash and dry in large commercial machines. Weight 4 lb. 1 oz. Length 92". Fits to 6'6". Width 37.5". Please note Unless otherwise specified, Regular length sleeping bags come with right-hand zippers, Long bags come with left-hand zippers.
Where to Buy
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L.L.Bean Down Sleeping Bag with DownTek, Mummy -20°
L.L.Bean Goose Down Sleeping Bag, Mummy -20°
The North Face Inferno -40F/-40C
Western Mountaineering Bison GWS
$1,095 - $1,150
Western Mountaineering Puma GWS
$945 - $995