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#5 on this list
Neutrino Pro 800
Rab
Hydrophobic Nikwax down and a Pertex Quantum Pro shell. The go-to British bag for damp cold.
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#6 on this list
Sonic -20
Nemo
Thermo Gills let you dump heat without opening the bag. The best-ventilating winter bag made.
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Specs side by side
| Spec | Neutrino Pro 800 | Sonic -20 |
|---|---|---|
| Fill Power | 800FP European Goose Down | — |
| Fill Type | Nikwax Hydrophobic Down | — |
| Shell Fabric | Pertex Quantum Pro | — |
| Zip Length | 3/4 length | — |
| Country of Origin | UK (design) | — |
| Intended Use | Winter mountaineering, alpine | — |
| Temperature Rating | — | -20°F (-29°C) |
| Insulation Type | — | 800 Fill Power Hydrophobic Down |
| Shape | — | Mummy |
| Ventilation | — | Thermo Gills |
| Primary Use | — | Winter camping, mountaineering |
What our reviewers liked and didn't
Neutrino Pro 800
- Excellent warmth for its weight, reliable in deep cold
- Hydrophobic down maintains loft better in damp conditions
- Durable Pertex Quantum Pro shell resists wind and moisture
- Good packability for multi-day winter trips
- High-quality construction and snag-free zipper
- Not the lightest option for those prioritizing extreme minimalism
- ¾ length zipper limits ventilation compared to full-zip models
- Mummy cut might feel restrictive for side sleepers
Sonic -20
- Thermo Gills allow unmatched temperature regulation
- Excellent warmth for its rating, even in damp conditions
- Generous internal space for comfortable movement
- High-quality hydrophobic down insulation
- Reinforced, waterproof footbox
- Not the absolute lightest -20°F bag available
- Higher price point than basic winter bags
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