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Compare Best Winter Sleeping Bags head to head
Pick any two picks from this list and see specs, current price, pros, cons and reader ratings side by side.
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#9 on this list
Defence 6
Carinthia
Austrian synthetic bag issued to alpine troops. The pick when your bag will get wet and stay wet.
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- How we assessed it
- Specification researched
#10 on this list
Ultima Thule -20
Wiggy's
Lamilite continuous-filament synthetic. Bulky, indestructible, and it still insulates soaked — a bush-Alaska staple.
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- How we assessed it
- Specification researched
Specs side by side
| Spec | Defence 6 | Ultima Thule -20 |
|---|---|---|
| Insulation | G-Loft Synthetic | — |
| Shell Fabric | Shelltex | — |
| Fill Type | Synthetic | — |
| Zip Type | Center Zip | — |
| Origin | Austria | — |
| Use Case | Extreme Cold, Wet Conditions | — |
| Insulation Type | — | Lamilite Continuous-Filament Synthetic |
| Temperature Rating | — | -20°F |
| Shell Material | — | Nylon |
| Zipper | — | Full-length, heavy-duty |
| Manufactured | — | USA |
What our reviewers liked and didn't
Defence 6
- Exceptional warmth retention when wet
- Extremely durable and robust construction
- Reliable performance in sub-zero, damp conditions
- Generous comfort ratings for extreme cold
- Central zip for easy entry/exit and ventilation
- Significantly heavier than comparable down bags
- Bulky pack size, even when compressed
- Less luxurious feel than high-end down bags
- Can be overkill for dry-cold conditions
Ultima Thule -20
- Retains insulation when completely soaked
- Extreme durability, built to last a lifetime
- Reliable warmth in sub-zero temperatures
- USA-made, robust construction
- Excellent for expedition-level cold
- Very heavy and bulky
- Not suited for backpacking where weight is critical
- Less comfortable than some modern bags
- Price point is a significant investment
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