Description Remarkably light and compact, the Helium delivers impressive insulation. Use it as a three plus season bag to substantially reduce your load while backpacking and mountaineering. Updated with our Down Defender treatment offering an extra level of moisture protection for sleeping bags exposed to wet environments. Specifications Temperature: 15oF, 9oC Weight:2 lb 6 ozs 1077 g Fill Weight:21.5 ozs 610 g Main Material: 20 Denier 100% Nylon Ripstop DWR 1.2 ozyd Lining Material: 30 Denier 100% Nylon 1.3 ozyd Insulation Material: 850 Goose Down Colors:Cobalt Blue Dark Azur EN Test What is EN testing with video Features Certified 850 Fill Power Goose Down Classic Trapezoidal Foot Box Down Defender to Improve Water Resistance in Wet Conditions EN Tested Filled and Finished in Santa Rosa, California Full Length Zipper Hood Draw Cord, Insulated Draft Tube Nautilus 6 Baffle Hood, Passive Collar Pertex Microlight Shell and Lining Fabric Stretch Tricot Baffles Stuff and Storage Sack Included Velcro free Face Muff Zipper Garage Zipper Guards Videos Marmot's own Curly Cervone takes you into the Down Room at Marmot Headquarters in Santa Rosa, CA, where our 850 fill sleeping bags are filled, sewn, and hand crafted right in our offices. Additional Information What makes Marmot Down so Special with video 850 Fill Dow Specific Features How to take care of your down sleeping bag with video Sleeping bags: Down vs. Synthetic. with video What is EN testing with video Awards Marmot's Ultralight Series Sleeping Bags Named Backpacker 2008 Editor's Choice Gold Award Winner. The Backpacker Editors' Choice Awards, given annually since 1993, honor the products that Backpacker editors have chosen as the best of the year based on months of trail testing by teams of highly experienced hikers and climbers. With no set categories for the awards and no set number of recipients, the products and the testing process drive the award categories. Marmot was two of only 17 innovative products that have been honored with a 2008 Backpacker Editors' Choice Award.