This is a mummy-shaped winter sleeping bag rated to an extreme -25 C (-13 F), built with a ThermoReflect heat-reflecting membrane for mountaineers and cold-weather campers facing serious sub-zero nights. Its comfort rating sits at -15 C (5 F), with a lower extreme of -25 C (-13 F) and an upper range of 14 C (57.2 F), so it is a dedicated deep-winter bag rather than a do-everything three-season compromise. Two 200 g/m2 layers of HollowCore insulation, backed by a reflective membrane that bounces body heat inward, are what let it hold warmth when temperatures drop far below freezing.
Terra Incognita is a European outdoor brand with more than 18 years of expedition experience and its own gear production, and this bag carries expedition-grade details throughout: a seamless outer shell, a reinforced T10 dual-slider zipper, an external wind baffle, and an adjustable anatomical hood that seals warmth around your head. For winter mountaineering, alpine base camps, and cold-climate expeditions, it is a purpose-built cocoon for the harshest nights.
Who is the Winter ThermoReflect bag for?
This bag is made for winter mountaineers, cold-climate expedition members, and campers who deliberately head out when temperatures fall well below freezing. It is not a general three-season bag; its -25 C extreme rating targets people who need survivable, sleepable warmth in true sub-zero conditions. If your trips involve alpine base camps, winter ascents, or expedition travel in the cold, this is the tool built for that job.
What is the Winter ThermoReflect bag made of?
The 210T rip-stop polyester shell wraps two 200 g/m2 layers of HollowCore insulation, and behind that sits a ThermoReflect membrane that reflects radiated body heat back inward. The 310T polyester lining feels smooth against skin while adding a thermal layer of its own. Seamless outer construction cuts down on the stitch lines that normally become cold spots, and the reinforced T10 dual-slider zipper is chosen to keep working reliably in freezing conditions.
How does the Winter ThermoReflect bag hold heat?
On a hard winter night, the layered insulation and reflective membrane work together to trap and return heat, while the external wind baffle and insulated zipper baffle stop drafts from stealing it. Cinch the anatomical hood down and only your breathing hole is exposed, sealing warmth around your head and neck. At 5.60 pounds and packing to 11.4 by 19.7 inches, it is a substantial bag, which is exactly what a -25 C rating requires.
Specifications
| Characteristic | Sleeping Bag Winter |
|---|---|
| Temperature, °C min comfort max |
-25 -15 +14 |
| Temperature, °F min comfort max |
-13 5 57.2 |
| Weight (EU) | 2.54 kg |
| Weight (US) | 5.60 lbs |
| Packed Size (EU) | ∅29 × 50 cm |
| Packed Size (US) | ∅11.4 × 19.7 in |
| Dimensions (EU) | 227 × 87/59 cm |
| Dimensions (US) | 89.4 × 34.3/23.2 in |
| Insulation Weight | 2 × 200 g/m² |
| Shell Material | 210T Ripstop Polyester |
| Lining Material | 310T Polyester |
| Insulation Type | HollowCore with ThermoReflect Membrane |
| Colors Available | Coyote, Olive |
| Shape | Mummy |
| Recommended Height | Up to 196 cm (77 in) |
| Season Rating | Winter |
| Special Features | ThermoReflect Technology, Seamless Construction, External Stuff Sack Pocket |
| Includes | Sleeping Bag, Compression Stuff Sack |
| Product Type | Winter Sleeping Bag |
Key features
- Rated to an extreme -25 C (-13 F) with a -15 C (5 F) comfort limit, so it is engineered for genuine deep-winter and expedition conditions
- ThermoReflect membrane reflects escaping body heat back toward the sleeper, boosting warmth without piling on extra fill weight
- Double 200 g/m2 HollowCore insulation delivers heavy loft that traps warm air through the coldest hours
- Mummy cut with an adjustable anatomical hood cinches around the head and shoulders to seal in heat where you lose it fastest
- Reinforced T10 dual-slider zipper resists snagging and lets you vent or exit from either end in the cold
- External wind baffle runs along the zipper to block drafts from cutting through the closure
- Seamless outer construction reduces cold-spot seams and stitch holes where heat can leak out
- Insulated draft protection around the zipper keeps the coldest air from reaching your core through the seam
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.
This is a mummy-shaped winter sleeping bag rated to an extreme -25 C (-13 F), built with a ThermoReflect heat-reflecting membrane for mountaineers and cold-weather campers facing serious sub-zero nights. Its comfort rating sits at -15 C (5 F), with a lower extreme of -25 C (-13 F) and an upper range of 14 C (57.2 F), so it is a dedicated deep-winter bag rather than a do-everything three-season compromise. Two 200 g/m2 layers of HollowCore insulation, backed by a reflective membrane that bounces body heat inward, are what let it hold warmth when temperatures drop far below freezing.
Terra Incognita is a European outdoor brand with more than 18 years of expedition experience and its own gear production, and this bag carries expedition-grade details throughout: a seamless outer shell, a reinforced T10 dual-slider zipper, an external wind baffle, and an adjustable anatomical hood that seals warmth around your head. For winter mountaineering, alpine base camps, and cold-climate expeditions, it is a purpose-built cocoon for the harshest nights.
Who is the Winter ThermoReflect bag for?
This bag is made for winter mountaineers, cold-climate expedition members, and campers who deliberately head out when temperatures fall well below freezing. It is not a general three-season bag; its -25 C extreme rating targets people who need survivable, sleepable warmth in true sub-zero conditions. If your trips involve alpine base camps, winter ascents, or expedition travel in the cold, this is the tool built for that job.
What is the Winter ThermoReflect bag made of?
The 210T rip-stop polyester shell wraps two 200 g/m2 layers of HollowCore insulation, and behind that sits a ThermoReflect membrane that reflects radiated body heat back inward. The 310T polyester lining feels smooth against skin while adding a thermal layer of its own. Seamless outer construction cuts down on the stitch lines that normally become cold spots, and the reinforced T10 dual-slider zipper is chosen to keep working reliably in freezing conditions.
How does the Winter ThermoReflect bag hold heat?
On a hard winter night, the layered insulation and reflective membrane work together to trap and return heat, while the external wind baffle and insulated zipper baffle stop drafts from stealing it. Cinch the anatomical hood down and only your breathing hole is exposed, sealing warmth around your head and neck. At 5.60 pounds and packing to 11.4 by 19.7 inches, it is a substantial bag, which is exactly what a -25 C rating requires.
Specifications
| Characteristic | Sleeping Bag Winter |
|---|---|
| Temperature, °C min comfort max |
-25 -15 +14 |
| Temperature, °F min comfort max |
-13 5 57.2 |
| Weight (EU) | 2.54 kg |
| Weight (US) | 5.60 lbs |
| Packed Size (EU) | ∅29 × 50 cm |
| Packed Size (US) | ∅11.4 × 19.7 in |
| Dimensions (EU) | 227 × 87/59 cm |
| Dimensions (US) | 89.4 × 34.3/23.2 in |
| Insulation Weight | 2 × 200 g/m² |
| Shell Material | 210T Ripstop Polyester |
| Lining Material | 310T Polyester |
| Insulation Type | HollowCore with ThermoReflect Membrane |
| Colors Available | Coyote, Olive |
| Shape | Mummy |
| Recommended Height | Up to 196 cm (77 in) |
| Season Rating | Winter |
| Special Features | ThermoReflect Technology, Seamless Construction, External Stuff Sack Pocket |
| Includes | Sleeping Bag, Compression Stuff Sack |
| Product Type | Winter Sleeping Bag |
Key features
- Rated to an extreme -25 C (-13 F) with a -15 C (5 F) comfort limit, so it is engineered for genuine deep-winter and expedition conditions
- ThermoReflect membrane reflects escaping body heat back toward the sleeper, boosting warmth without piling on extra fill weight
- Double 200 g/m2 HollowCore insulation delivers heavy loft that traps warm air through the coldest hours
- Mummy cut with an adjustable anatomical hood cinches around the head and shoulders to seal in heat where you lose it fastest
- Reinforced T10 dual-slider zipper resists snagging and lets you vent or exit from either end in the cold
- External wind baffle runs along the zipper to block drafts from cutting through the closure
- Seamless outer construction reduces cold-spot seams and stitch holes where heat can leak out
- Insulated draft protection around the zipper keeps the coldest air from reaching your core through the seam
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
Winter ThermoReflect bag FAQ
How cold can this sleeping bag handle?
This bag is rated to an extreme -25 C (-13 F), with a comfort rating of -15 C (5 F) and an upper range of 14 C (57.2 F). The comfort figure is the realistic all-night warmth limit for most sleepers, while the -25 C extreme marks the survival end of its range for genuine deep-winter use.
What is a ThermoReflect membrane and how does it help?
A ThermoReflect membrane is a reflective layer inside the bag that bounces your radiated body heat back toward you. On this bag it works alongside the double HollowCore insulation to raise warmth without adding equivalent fill weight, which is a key reason the bag reaches its extreme cold rating.
Is this a good sleeping bag for winter camping?
Yes, this is a dedicated winter bag purpose-built for extreme cold. Its -25 C extreme rating, double 200 g/m2 insulation, reflective membrane, wind baffle, and cinching anatomical hood are all aimed at sub-zero nights, making it far more capable in true winter than a general three-season bag.
How much does this winter sleeping bag weigh?
This bag weighs 5.60 pounds and packs down to roughly 11.4 by 19.7 inches. That weight and bulk are the trade-off for extreme-cold performance; the heavy dual insulation and reflective membrane needed to reach -25 C simply require more material than a lighter three-season bag.
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