Mountaineering missions in sub-zero temperatures are no joke—which is why we trust serious sleeping bags like the Rab Andes Infinium 1000 Down Sleeping Bag. Rated down to -20 degrees Farenheight, Rab's expedition-grade bag takes on extreme cold with a snug mummy shape that's stuffed with high-loft 800-fill goose down and lined with a heat-reflective titanium layer to limit radiant heat loss. That life-saving down is protected with a hydrophobic treatment and a GORE-TEX Infinium membrane with a durable water repellent to keep snow and moisture from compromising the insulating loft—or getting us wet. A down-filled neck collar, face baffle, and baffle over the zipper complete our protective cocoon, so we can conquer high-altitude routes in the Andes, the world's highest peaks, and arctic conditions. Rab's expedition-grade down sleeping bag for extreme conditionsRated to -20F 800-fill down is exceptionally light, warm, and packableDown treated with Nikwax hydrophobic finish to resist moisture GORE-TEX Infinium adds breathability, wind- and water-resistance TILT thermal lining reflects heat back to body to reduce heat loss Trapezoidal boxwall and differential cut increase loft and warmthWaterproof stuff sack and home storage sack included Material[face fabric] 13D GORE-TEX INFINIUM, WINDSTOPPER, DWR finish, [lining] 20D nylon ripstop, TILT technologyInsulation800-fill European goose downShapemummyZipper3/4-lengthMax User Height6ft 5inShoulder Circumference63inHip Circumference53.5inFoot Circumference42.5inBag Length88.6inDraft TubeyesPockets[internal] 1 zippered stashPad Retainernone Degree-20FStorage Sackzippered cotton sackStuff Sackwaterproof roll-top compressionStuff Size19.7 x 11.8inClaimed Weight3lb 8ozActivitymountaineering, winter camping Manufacturer Warrantylifetime