Sierra Designs Nitro UL 800 0 Degree Sleeping Bag

With its classic mummy cut, weather-resistant treated down insulation, and weight well under 3 pounds, the Sierra Designs Nitro UL 800 0 Degree sleeping bag is a lightweight, packable option for cold-weather backpacking.

Renowned for their efficiency in retaining heat and compressible properties, the feathers and fibers of duck 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 inherent weakness of down insulation is that it loses much of its ability to maintain warmth when it gets wet, but the bag’s 800-fill fluro-carbon-free DriDown performs differently. Employing a unique, innovative polymer application, DriDown actually creates a hydrophobic finish on each individual plume of down. This treatment results in insulation that stays dry longer and dries faster, should it become wet, than untreated down. Perhaps most impressively, this allows the insulation to retain 98% of its loft which translates into maintained warmth that untreated down bags simply cannot achieve. A 15D nylon ripstop shell further protects the bag’s interior while keeping weight to a minimum.

The bag’s mummy cut increases thermal efficiency by eliminating potential dead spots. It also helps to keep weight to a minimum. A draft collar aids in keeping cold air out of the interior of the bag. An ergonomic hood helps reduce heat loss by keeping your head warm and comfortable. Insulated, baffled sidewalls keep insulation from shifting and give the bag depth to maximize the feeling of livability while retaining warmth. A unique self-sealing foot vent allows you to extend your feet out of the bottom of the bag in balmy weather but effectively retains heat when temperatures require it.

The Sierra Designs Nitro UL 800 0 Degree sleeping bag is available in Regular (fits up to 6' 0") and Long (fits up to 6' 6") lengths. A stuff sack and storage sack are included.