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NEMO Sonic Down Mummy 0deg Sleeping Bag
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$599.95
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SKU: WX2*0742854
Overview
Built for cold-weather nights when dependable warmth matters most, this mummy-style sleeping bag is aimed at hunters and mountain travelers who need a single bag for demanding conditions. Its adjustable venting and multistage zipper system let you fine-tune comfort as temperatures change, while the chevron baffle construction is designed to keep insulation evenly distributed. Recycled, bluesign-approved shell and liner fabrics, along with RDS-certified hydrophobic down, reflect a lower-impact materials approach without changing the bag’s purpose as an extreme-weather option. Features such as the redesigned draft collar, bolstered draft tubes, and footbox add practical refinements, though the bag’s specialized design is best suited to serious cold rather than all-season versatility.
Why Hunters Choose the Nemo
Rated 0°
To 40°F, offering a wide
Second-generation Thermo
Gill vents and multistage zipper
Chevron Baffle
Construction helps keep down evenly
Shell Liner
Use 100% recycled, bluesign-approved fabrics
Premium 800
Fill power hydrophobic down is
Key Features
- Rated 0°F to 40°F for cold-weather use across a wide temperature range.
- Second-generation Thermo Gill vents with multistage zipper system for fine-tuning comfort.
- Chevron baffle construction helps keep down evenly lofted and compartmentalized.
- Shell and liner use 100% recycled, bluesign approved fabrics.
- Filled with premium 800 FP hydrophobic down, certified to the Responsible Down Standard.
- Toester footbox adds warmth and helps protect against tent-wall condensation and moisture.
Best Used For
- Cold-weather hunters needing a mummy bag for frosty bivy camps and mountain nights.
- Backcountry users who want adjustable warmth across changing temperatures without carrying multiple bags.
- Side sleepers needing extra knee stretch in a cold-weather sleeping bag.
- Hunters prioritizing recycled, bluesign-approved materials and RDS-certified down.
- Campers dealing with tent condensation who want added footbox protection and moisture management.
Specifications
| Awards | Backpacker Editors' Choice award-winning |
|---|---|
| Baffle Construction | Chevron baffle construction |
| Down Type | Hydrophobic down |
| Draft Collar | Redesigned |
| Draft Tubes | Bolstered |
| Environmental Impact | Reduced environmental impact |
| Fill Power | 800 FP |
| Footbox | Toester footbox |
| Knee Area | Stretch construction |
| Liner Fabric | 100% recycled, bluesign approved |
| Rds Certified | Yes |
| Shell Fabric | 100% recycled, bluesign approved |
| Temperature Rating | 0°F to 40°F |
| Thermo Gill Vents | Second-generation |
| Zipper Position | Offset zipper |
| Zipper System | Multistage zipper system |
Pros
- Rated for 0° to 40°F, offering a wide temperature range for changing conditions.
- Second-generation Thermo Gill vents and multistage zipper allow fine comfort adjustment.
- Chevron baffle construction helps keep down evenly lofted and compartmentalized.
- Shell and liner use 100% recycled, bluesign-approved fabrics.
- Premium 800 fill power hydrophobic down is RDS certified.
- Toester footbox adds warmth and helps manage tent-wall condensation.
Considerations & Trade-offs
- The 0°F rating and mummy cut point to a bag built for cold conditions, but that also means it may be more than many hunters need for milder-season trips.
- Thermo Gill vents and the multistage zipper add temperature control, but they also introduce more features to manage compared with a simpler sleeping bag.
- The premium 800 FP hydrophobic down and recycled, bluesign-approved materials support performance and sustainability, though they place this bag at a higher price point.
- The Toester footbox and draft-focused design add warmth and moisture protection, but they also make the bag more specialized for cold-weather use than for maximum versatility in warm conditions.
Suggested Comparisons
- Cold-weather sleeping bags
- Mummy sleeping bags
- Down sleeping bags
- Ultralight backpacking sleeping bags
Suggested Accessories
- Sleeping bag liner
- Compression sack
- Sleeping pad
- Stuff sack
Frequently Asked Questions
What temperature range is this sleeping bag rated for?
The product is rated from 0°F to 40°F.
What features help adjust comfort in changing conditions?
It uses second-generation Thermo Gill vents with a multistage zipper system, allowing fine-tuning of comfort from inside the bag and expanding the usable temperature range.
What materials are used in the shell and liner?
The shell and liner fabrics are 100% recycled and bluesign approved.
What kind of insulation does it use?
The bag is filled with premium 800 FP hydrophobic down, and the down is 100% Responsible Down Standard (RDS) certified.
Does it have any features for foot warmth or moisture protection?
Yes. The Toester footbox is designed to keep feet warmer, provide a waterproof barrier against tent wall condensation, and help protect the down from moisture while drying damp clothes inside the footbox.