How to Choose Sleeping Bags for Backpacking
NEMO Sonic 0 Sleeping Bag
This product is not available. Good news: we have a newer version.
Stay cozy on frozen mountain bivouacs in the 800-fill-power down comfort of the NEMO Sonic 0 sleeping bag. Adjustable Thermo Gills™ regulate temperature without letting cold drafts in.
Shop newer versionKey Details
Fill
800-fill-power hydrophobic down
Temperature Rating (F)
0 degrees (F)
- Overstuffed with hydrophobic, PFC-free down; Responsible Down Standard (RDS) certification ensures humane treatment and traceability throughout the supply chain
- Waterproof/breathable Toester™ footbox is shaped for foot comfort; it has a layer of synthetic insulation to help eliminate cold spots
- 20-denier ripstop nylon shell fabric and 30-denier nylon taffeta lining feature durable water repellent (DWR) treatments to shrug off moisture
- Redesigned draft collar and draft tubes provide a secure barrier against cold air; offset zipper creates a thermally efficient seal
- Contoured hood with drawstring cord maximizes thermal efficiency
- Stretch construction at the knees allows side sleeping
- Updated profile holds warmth closer to your body
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all NEMO Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Mountaineering |
|---|---|
| Tested Lower Limit | -1 degrees (F) - EN |
| Tested Comfort | 14 degrees (F) - EN |
| Temperature Rating (F) | 0 degrees (F) |
| Temperature Rating (C) | -18 degrees (C) |
| Shell | 20-denier ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 800-fill-power hydrophobic down |
| Lining | 30-denier nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Volume | 13 liters |
| Gender | Unisex |
| Sustainability | Down certified to the Responsible Down Standard (RDS) |
