Alpine Down Sleeping Bag Gear up for your next high altitude or colder latitude adventure with the Alpine Down Sleeping Bag. The expedition mummy fit provides ample space for winter gear, while the modified Free-Flow Zip system provides ventilation and versatility. Complex construction throughout and 850+ fillpower, RDS-certified non-PFAS Ultra-Dry Goose Down delivers maximum warmth retention. Tech Specs Materials Shell: 100% nylon Lining: 100% nylon Down fill: 90/10 Goose Down Stuff Sack: 100% nylon - excluding trims Insulation RDS certified, 850+ fillpower goose down with a non-PFC Ultra-Dry Down treatment Specifications by Temp Rating & Size Temp Rating & Size Weight Packed Weight Dimension Packed Size Compressed Volume Length Recommended User Height Fill Weight Temp Rating (ISO Lower) Temp Rating (ISO Comfort) -20°F / Regular 1459 g | 51.5 oz 1562 g | 55.1 oz 196 x 80 cm | 77 x 31 in 50 x 30 x 20 cm | 20 x 12 x 8 in 12.6 L 196cm | 77in 183 cm | 72.05 in 1000 g | 35.27 oz -29 °C | -20 °F -19 °C | -2 °F -20°F / Long 1645 g | 58.0 oz 1748 g | 61.7 oz 211 x 85 cm | 83 x 33 in 50 x 30 x 20 cm | 20 x 12 x 8 in 14 L 211cm | 83in 198 cm | 77.95 in 1135 g | 40.04 oz -29 °C | -20 °F -19 °C | -2 °F Key Features RDS-certified, 850+ fillpower goose down with a non-PFAS Ultra-Dry Down treatment for maximum thermal performance Recycled 20D nylon shell material with non-PFAS DWR is light and durable. Hood and footbox have a highly water resistant, breathable fabric for extra moisture protection - ideal for bivies or snow caves Roomy expedition mummy fit provides plenty of space for you, performance clothing and gear you don't want to freeze Highly breathable liner for enhanced comfort Free-Flow Zip System: Full-length zipper with half-length zipper on opposite side for excellent temperature regulation Technical hood and footbox, efficient mummy shape and generous draft tubes on the zippers maximize warmth retention Available Options Temp Rating -20°F Size Regular Long