Compact and weighing well under 2 lbs, the Marmot Atom 40 Degree sleeping bag is an ideal choice for high-performance backpacking in summer or warm climates. An array of features and 850+ fill down insulation make the Atom 40 Degree ready for backcountry adventure.
The Atom 40 Degree is insulated with certified 850+ fill goose down. Fill power measures the loft or "fluffiness" of down insulation and Marmot goes to great lengths to guarantee the 850+ certification with a battery of in-house and external verifications. Renowned for their efficiency in retaining heat and compressible properties, the feathers and fibers of down have an incredibly soft, comfortable feel and, despite advances in synthetic materials, continue to provide the best warmth-to-weight ratio of any insulation available. The one weakness of down insulation is that it loses much of its ability to maintain warmth when it gets wet; this is less of a problem in the Atom 40 Degree, though, since the down in this bag is protected with Marmot’s Down Defender water repellent treatment that allows the down to stay drier 10 times longer than untreated down in damp conditions. Down Defender down also Maintains 150% more loft and dries 30% faster than untreated down.
Despite its lightweight construction, the Atom 40 Degree makes no sacrifice with regards to performance and features. Eliminating cold spots and providing comfort, sewn-through baffles ensure that the Atom 40 Degree's insulation is distributed evenly throughout the bag. The Nautilus 3D contoured, ergonomic hood mirrors the design of Marmot's popular outerwear jackets, helps reduce heat loss and keeps your head warm and comfortable. An insulated oversized draft tube sewn behind the full-length zipper keeps cold air from reaching the inside of the sleeping bag and zipper guards help to avoid irritating and damaging snags. Marmot's patented Trapezoid Foot Box is wider at the toes and narrower at the heels, providing a more natural fit and improving warmth and comfort.
Filled and finished in the USA (Rohnert Park, CA), the Marmot Atom 40 Degree sleeping bag is available in Regular (fits up to 6' 0") and Long (fits up to 6' 6") lengths. A stuff and storage sack is included.
- Filled and Finished in Rohnert Park, California
- Certified 850+ Fill Power Goose Down
- Down Defender to Improve Water-Resistance in Wet Conditions
- EN Tested
- Pertex Microlight Shell and Lining Fabric
- Sewn-Through Baffles
- Nautilus 6-Baffle Hood
- Classic Trapezoidal Foot Box
- Hood Drawcord
- Full Length Zipper
- Insulated Draft Tube
- Stretch Tricot Baffles at Hood and Foot Box
- Velcro-free Face Muff
- Zipper Garage
- Stuff and Storage Sack Included
- Zipper Guards
Best Use Backpacking, Camping Insulation Type Down Warranty Lifetime Type Down Temperature Rating 40 Degrees F Shell Material 20 Denier 100% Nylon Ripstop DWR 1.2 oz/yd Packed Size 6" x 12" Other Stuff Sack and Storage Sack Included Liner Material 30D 100% Nylon 1.3 oz/yd Item Weight 1 lb 5.52 oz Fits to Length 6' 0" Fits to Girth 61" Fill Material 850+ Fill Power Goose Down EN Lower Limit Rating 43.2 Degrees F EN Comfort Rating 50.5 Degrees F
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