Description of Mountain Hardwear Wraith SL -20° Sleeping Bag Specifically designed for cold-weather expeditions, the Wraith™ is nearly impervious to weather. Mountain Hardwear’s exclusive welded-baffle construction and moisture shedding Conduit™ SL shell aid insulation and provide superior wind and weather protection. Wraith’s roomy cut provides room for dressing / undressing, or for extra comfort when you’re waiting out a storm at base camp. "Air temp -61°F… wind, none… sky, clear… time till sunrise, 14 hours... time to sunset, 19 hours… location, Mt Sanford Alaska... winter open bivy at 16000 feet... The bag… The Wraith." – John Varco, Alpinist Features: Insulation 800-fill Down Temp. rating -20 F / -28 C Lining 30D Nylon Taffeta Shell Fabric Nylon Ripstop SL ™ Weight 4 lbs, 4 oz / 1930.00 g Size REG, LONG, REG, LONG, REG, LONG Loft 9.00 in / 22.86 cm Stuffed diameter 10.00 in / 25.40 cm Stuffed length 19.00 in / 48.26 cm Fill weight 2 lbs, 4 oz / 1020.60 g Inside length 78.00 in / 198.12 cm Shoulder girth 63.00 in / 160.02 cm Foot girth 39.00 in / 99.06 cm Premium 800-fill down insulation provides outstanding lightweight warmth and loft Conduit SL shell is waterproof, breathable, windproof, durable and lightweight Unique welded baffle construction eliminates stitch holes yields a waterproof shell and protects down fill from moisture intrusion, unlike stitched baffle bags. 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 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 Nylon mesh storage bag and stuff sack included Conduit SL shell is waterproof, breathable, windproof, durable and lightweight Down-filled face gasket comfortably blocks drafts at the hood opening