Description of Marmot Atom 40°F Sleeping Bag Regular The Atom’s ultra-light design and our highest quality down have given it cult status among alpinists as a bivvy bag on extreme climbs, but its comfortable, silky fabric make it a great bag for warm-weather bivvies on casual summer road trips as well. Features: Weight: 1 lb 5 ozs / 595 g Fill Weight: 8 ozs / 226.8 g Main Material: LightForce 1.2 oz 100% Nylon Ripstop DWR Lining Material: LightForce 1.0 oz 100% Polyester Taffeta DWR Insulation Material: 850+ Goose Down Size for stature: 183 cm Size on shoulder: 157 cm Size on hip: 147 cm Size on foot: 102 cm Colors: 6580 - Fire EN 13537 Tested Comfort: 50.5F / 10.3C Lower Limit: 43.2F / 6.2C Extreme: 18.7F / -7.4C Classic Trapezoidal Foot Box For More Foot Room Full-length Zipper Hood Draw Cord Positioned for Easy Access Insulated Draft Tube Eliminates Cold Leaks Through the Zipper Stretch Tricot Baffles at Hood and Foot Box Stuff and Storage Sack Included Store and Pack Just Like Your Sleeping Bag Velcro®-free Face Muff Keeps the Drawcord and Zipper Away from Your Face Zipper Guards Help Repel Biting Zipper Coils Filled and Finished in Santa Rosa, California Certified 850+ Fill Goose Down The Best Weight to Warmth Down in the Market; Independently Tested and Certified by International Down and Feather Laboratory in Salt Lake City, Utah. Retested at Fill Time in Santa Rosa to Ensure 850+ Fill Power Every Time. If the Down Does Not Meet Our In-House Test, We Send It Back EN Tested Sewn-Through Baffles Makes the Overall Weight Lighter Nautilus 6-Baffle Hood 6 Chambers of Down Around Head for Better Down Control and Fit, Hood Cord is Positioned for Easy Access