Mammut Sphere UL Spring - Backpacker

Mammut Sphere UL Spring

This bag's revolutionary shape delivers maximum roll-around comfort with minimum weight.
Sphere UL Spring
Price $369.95


Fill Power 850
Features Hood
Weight 1 lb, 2 oz

“The best night of sleep I’ve ever had in the backcountry,” says our deputy editor, who couldn’t believe so much comfort could come in such a small package. He’s never had a good night’s rest in a traditional mummy bag, which enforces a straight-leg position that hog-ties knee-huggers, side-sleepers, and other restless bodies (about 50 percent of the population).

But the down-filled Nocturne uses an innovative hourglass design (NEMO calls it the “Spoon”) that’s tapered at the waist and feet—making it lighter than comparable rectangular bags, but wider at the knees than conventional mummies. “The ability to roll over and slide my legs up inside the bag gave me unfettered, home-like comfort,” our gear editor reports after a week in Tasmania. But shape is only one innovation. At the neck, an extra flap of insulation called the “blanket fold” acts like a mini down comforter: Unfold it outside of the bag for more neck venting, or pull it inside for a cozy seal. A pillow pocket inside the base of the hood is perfectly positioned to stuff a down jacket.

Waterproof/breathable fabric on the footbox repels tent condensation, and the bag is stuffed with water-repellent, 700-fill DownTek. Individual feathers are treated to resist moisture, giving it an extra layer of insurance in wet weather. From the arid canyons of Zion National Park to the soggy lakeshores along Maine’s Appalachian Trail, the Nocturne’s vertical baffles provided even warmth right down to the bag’s 30°F rating. Even our coldest-bodied camper called the Nocturne’s comforts “pioneering.” Says one tester, “If you crave more space than a mummy provides, this is your ticket to dreamland.” Couples bonus: the Nocturnes can be zipped together. Nocturne 15: $400; 2 lbs. 11 oz.; 15°F. Nocturne 30: $350; 2 lbs.; 30°F; nemosleepingbags.comExtremely lightweight materials and top quality down make the Sphere UL one of the lightest sleeping bags with the lowest packing volume.
– The prolightTX™ outer fabric is featherlight, windproof and water repellent
– Wave-shaped chambers prevent slipping of the down and stop cold spots
– Performance Hood with Advanced Visibility offers a full view with the hood closed and very good protection against the cold
– Ergonomic Foot increases comfort and insulation
– Two-layer 9-chamber construction in the foot area – for extra warmth in the winter model
– The prolightTX™ outer fabric of the Sphere UL models has a DWR coating for better protection from wind and wet conditions