The Terra Incognita Polus 400 is an extreme-cold winter sleeping bag with a comfort rating of 8.6F (-13C) and a limit of -4F (-20C), built for serious sub-zero camping, mountaineering, and cold-weather expeditions. A double layer of HollowCore synthetic insulation (2 x 200 g/m2) traps a deep envelope of warm air, while an adjustable hood and draft collar seal in heat around the head and shoulders where cold sleepers lose it fastest. A standout quick-exit system with dual two-way zippers lets you get out fast in an emergency or vent heat quickly when conditions change.
Made in-house by Terra Incognita, a European brand with over 18 years of expedition experience, the Polus 400 is a mummy-cut bag shaped for real winter use: 88.6 in long, tapering from 34.3 to 23.6 in, with a fleece lining that feels warm against skin from the moment you climb in. When the forecast drops well below freezing, this is a bag you can trust to keep you safe through the night.
Who is the Polus 400 sleeping bag for?
The Polus 400 is for winter campers, alpinists, and cold-weather travelers who need dependable warmth below freezing rather than a three-season compromise. If you camp in real snow, sit through hard frosts, or head into the mountains in the cold months, its -4F limit gives you a safety margin. It is a substantial bag at 5 to 5.7 lbs, so it is aimed at those who prioritize surviving and sleeping well in the cold over shaving pack weight.
What insulation does the Polus 400 use?
The core is a double layer of HollowCore synthetic insulation totaling 2 x 200 g/m2, arranged to eliminate cold spots and hold a thick loft of trapped air. Synthetic fill is a deliberate choice for winter: it keeps working when it takes on moisture from breath and tent condensation, and it dries faster than down between trips. The 210T polyester ripstop shell resists abrasion from snow and rough shelters, while the T/C fleece lining removes that first-contact chill when you slide inside.
How does the Polus 400's quick-exit system work?
Two two-way zippers run the length of the bag, and together they form the quick-exit system. In an emergency you can open the bag fully in one motion rather than fighting a single stuck slider. On milder nights the same zippers let you vent from the feet or the chest to shed heat without fully unzipping, so you can fine-tune your temperature through the night instead of waking up sweating or freezing.
Specifications
| Characteristic | Polus 400 |
|---|---|
| Temperature, °C min comfort max |
-20 -13 +13 |
| Temperature, °F min comfort max |
-4 8.6 55.4 |
| Min Weight (EU) | 2.30 kg |
| Min Weight (US) | 5.07 lbs |
| Max Weight (EU) | 2.57 kg |
| Max Weight (US) | 5.67 lbs |
| Packed Size (EU) | ∅29 × 48 cm |
| Packed Size (US) | ∅11.4 × 18.9 in |
| Dimensions (EU) | 225 × 87/60 cm |
| Dimensions (US) | 88.6 × 34.3/23.6 in |
| Shell Material | 210T Polyester Rip Stop |
| Lining Material | T/C Fleece |
| Insulation | HollowCore (2 × 200 g/m²) |
| Colors | Khaki, Olive |
| Shape | Mummy |
| Height Fit | Up to 196 cm (77 in) |
| Season Rating | Winter |
| Special Features | Dual two-way zipper, Draft collar, Internal pocket, Compression stuff sack |
| Product Type | Winter Sleeping Bag |
Key features
- Comfort rated to 8.6F (-13C) with a survival limit of -4F (-20C) for genuine deep-winter camping
- Double-layer HollowCore synthetic insulation at 2 x 200 g/m2 builds a thick, continuous barrier against extreme cold
- Quick-exit system with dual two-way zippers lets you escape fast or dump heat in seconds when you overheat
- Adjustable hood cinches around the head to seal in warmth on the coldest nights
- Draft collar across the shoulders blocks cold air from sneaking in when you shift position
- Synthetic fill keeps insulating even in the damp, condensation-heavy conditions common in winter tents
- Soft T/C fleece lining feels warm immediately against skin, unlike cold slick nylon liners
- Internal security pocket keeps a phone, headlamp battery, or keys warm and within reach overnight
Who makes it
Terra Incognita has spent more than 18 years running trips and expeditions and manufacturing its own outdoor gear, so this model comes off the brand's own production line rather than a rebadged catalog. The design is tested in the field by the people who guide the trips.
The Terra Incognita Polus 400 is an extreme-cold winter sleeping bag with a comfort rating of 8.6F (-13C) and a limit of -4F (-20C), built for serious sub-zero camping, mountaineering, and cold-weather expeditions. A double layer of HollowCore synthetic insulation (2 x 200 g/m2) traps a deep envelope of warm air, while an adjustable hood and draft collar seal in heat around the head and shoulders where cold sleepers lose it fastest. A standout quick-exit system with dual two-way zippers lets you get out fast in an emergency or vent heat quickly when conditions change.
Made in-house by Terra Incognita, a European brand with over 18 years of expedition experience, the Polus 400 is a mummy-cut bag shaped for real winter use: 88.6 in long, tapering from 34.3 to 23.6 in, with a fleece lining that feels warm against skin from the moment you climb in. When the forecast drops well below freezing, this is a bag you can trust to keep you safe through the night.
Who is the Polus 400 sleeping bag for?
The Polus 400 is for winter campers, alpinists, and cold-weather travelers who need dependable warmth below freezing rather than a three-season compromise. If you camp in real snow, sit through hard frosts, or head into the mountains in the cold months, its -4F limit gives you a safety margin. It is a substantial bag at 5 to 5.7 lbs, so it is aimed at those who prioritize surviving and sleeping well in the cold over shaving pack weight.
What insulation does the Polus 400 use?
The core is a double layer of HollowCore synthetic insulation totaling 2 x 200 g/m2, arranged to eliminate cold spots and hold a thick loft of trapped air. Synthetic fill is a deliberate choice for winter: it keeps working when it takes on moisture from breath and tent condensation, and it dries faster than down between trips. The 210T polyester ripstop shell resists abrasion from snow and rough shelters, while the T/C fleece lining removes that first-contact chill when you slide inside.
How does the Polus 400's quick-exit system work?
Two two-way zippers run the length of the bag, and together they form the quick-exit system. In an emergency you can open the bag fully in one motion rather than fighting a single stuck slider. On milder nights the same zippers let you vent from the feet or the chest to shed heat without fully unzipping, so you can fine-tune your temperature through the night instead of waking up sweating or freezing.
Specifications
| Characteristic | Polus 400 |
|---|---|
| Temperature, °C min comfort max |
-20 -13 +13 |
| Temperature, °F min comfort max |
-4 8.6 55.4 |
| Min Weight (EU) | 2.30 kg |
| Min Weight (US) | 5.07 lbs |
| Max Weight (EU) | 2.57 kg |
| Max Weight (US) | 5.67 lbs |
| Packed Size (EU) | ∅29 × 48 cm |
| Packed Size (US) | ∅11.4 × 18.9 in |
| Dimensions (EU) | 225 × 87/60 cm |
| Dimensions (US) | 88.6 × 34.3/23.6 in |
| Shell Material | 210T Polyester Rip Stop |
| Lining Material | T/C Fleece |
| Insulation | HollowCore (2 × 200 g/m²) |
| Colors | Khaki, Olive |
| Shape | Mummy |
| Height Fit | Up to 196 cm (77 in) |
| Season Rating | Winter |
| Special Features | Dual two-way zipper, Draft collar, Internal pocket, Compression stuff sack |
| Product Type | Winter Sleeping Bag |
Key features
- Comfort rated to 8.6F (-13C) with a survival limit of -4F (-20C) for genuine deep-winter camping
- Double-layer HollowCore synthetic insulation at 2 x 200 g/m2 builds a thick, continuous barrier against extreme cold
- Quick-exit system with dual two-way zippers lets you escape fast or dump heat in seconds when you overheat
- Adjustable hood cinches around the head to seal in warmth on the coldest nights
- Draft collar across the shoulders blocks cold air from sneaking in when you shift position
- Synthetic fill keeps insulating even in the damp, condensation-heavy conditions common in winter tents
- Soft T/C fleece lining feels warm immediately against skin, unlike cold slick nylon liners
- Internal security pocket keeps a phone, headlamp battery, or keys warm and within reach overnight
Who makes it
Terra Incognita has spent more than 18 years running trips and expeditions and manufacturing its own outdoor gear, so this model comes off the brand's own production line rather than a rebadged catalog. The design is tested in the field by the people who guide the trips.
Questions & answers
Polus 400 FAQ
How cold can the Polus 400 sleeping bag handle?
The Polus 400 is comfort rated to 8.6F (-13C) with a lower limit of -4F (-20C). That means most sleepers stay warm around -13C, while the -20C limit marks the coldest temperature at which the bag is designed to keep you safe.
Is this bag good for winter camping?
Yes, the Polus 400 is a dedicated winter bag rated to -4F (-20C), making it suitable for snow camping, mountaineering, and hard frosts. Its double-layer synthetic insulation, hood, and draft collar are built specifically for deep-cold conditions.
Does synthetic insulation work in wet, cold conditions?
Yes, HollowCore synthetic insulation keeps trapping warmth even when it absorbs moisture from breath or tent condensation. That reliability in the damp is why the Polus 400 uses synthetic fill instead of down for serious winter use.
What is the quick-exit system for?
The quick-exit system uses dual two-way zippers that let you open the bag fully and fast in an emergency, or vent heat from the feet or chest when you get too warm. It gives you both a rapid escape and precise temperature control.
How much does the Polus 400 weigh and how small does it pack?
The Polus 400 weighs 5 to 5.7 lbs (2.30 to 2.57 kg) and packs to 11.4 x 18.9 in. That heft reflects its heavy winter insulation, so it is best carried on cold-weather trips where warmth outranks minimal pack weight.
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