Description of Mountain Hardwear Ghost SL -40° Sleeping Bag Nearly impervious to weather, the Ghost™ SL is designed for Arctic, Himalayan, and Antarctic expeditions. It is Mountain Hardwear's most hardcore, cold temperature bag. Mountain Hardwear’s exclusive welded-baffle construction and moisture shedding Conduit™ SL shell aid insulation and wind resistance. Ghost’s roomy cut provides room for dressing / undressing, or for extra comfort when you’re waiting out a storm at base camp. Features: Temp. rating -40 F / -40 C Bag Shape Winter Mummy Cut Weight 5 lbs, 0 oz / 2270.00 g Laminate Conduit™ Shell Fabric Nylon Ripstop SL ™ Insulation 800-Fill Goose Down Lining 30D Nylon Taffeta Loft 10.00 in / 25.40 cm Stuffed diameter 10.00 in / 25.40 cm Stuffed length 21.00 in / 53.34 cm Fill weight 2 lbs, 12 oz / 1269.67 g Fill weight 2 lbs, 10 oz / 1200.82 g Inside length 78.00 in / 198.12 cm Inside length 84.00 in / 213.36 cm Shoulder girth 63.00 in / 160.02 cm Shoulder girth 65.00 in / 165.10 cm Foot girth 41.00 in / 104.14 cm Foot girth 39.00 in / 99.06 cm Slightly wider mummy cut 800-fill down insulation provides outstanding lightweight warmth and loft Conduit SL shell is waterproof, breathable, windproof, durable and lightweight Patented welded baffle construction eliminates needle holes in shell fabric, yielding a waterproof construction and protecting the down from external moisture. Laminated, double external zipper flaps keep water out 5" baffle spacing keeps down carefully controlled for even, predictable loft Six-chamber hood design maintains even loft around head for consistent warmth Down-filled face gasket comfortably blocks drafts at the hood opening. Only a slight tightening of the draw cord is required to seal in warmth. Ergonomic draft collar blocks the escape of heated air from inside the bag. The two-piece collar drapes naturally over neck and shoulders creating a soft comfortable seal. Two draw cords can snug down as needed to secure the collar. Two small pockets above collar provide storage for small items Double draft tubes along zipper prevent cold spots Comfort Footbox follows natural foot position for maximum warmth and comfort Storage sack and stuff sack included