Wide-cut insulation gear for bivouacking
The Aegismax D2 meets the need for interior space without sacrificing thermal efficiency. This 0-degree down sleeping bag adopts a less restrictive shape than a classic mummy cut, allowing for free leg movement. This additional air volume, however, requires the sleeper to generate enough heat; the use of dry technical base layers and an insulated sleeping pad is therefore recommended to maintain the comfort temperature of 0°C.
Fill power and durability of the filling
Full-height baffle structure and closing components
The D2's internal construction relies on continuous transverse baffles that distribute the RDS-certified duck down across the entire width of the bag, limiting localized clumping in this bivouac sleeping bag. The closure uses a YKK zipper with a reinforced slider and Duraflex buckles, two components proven for their durability on equipment used regularly.
Included accessories: compression sack and storage bag
The D2 comes with a compression sack for transport and a breathable mesh bag for long-term storage, practical accessories for any 0-degree sleeping bag. Keeping the down in the mesh bag rather than compressed between uses preserves its loft over the long term, unlike permanent storage in a compression sack.
This model is available in black with the same thermal characteristics and 650 cuin fill: the Aegismax D2 in black.
Doubt about which bag is right for you?
The field guide helps you choose based on skill level, temperature, needs, and weight. Support answers specific questions.
Find my bag Contact supportFrequently Asked Questions
The Aegismax D2 has a comfort temperature of 0°C and a lower limit temperature of -5°C, measured to the EN 13537 standard. These values apply under standard conditions: sleeper in thermal base layers, on an insulated sleeping mat. It is designed for hiking, bivouacking use (3 seasons).
The Aegismax D2 is filled with 650 fill power, RDS certified. The Aegismax D2 weighs 1006 g, which places it in the lightweight category.
The lower limit temperature is the lowest temperature at which a reference man can maintain his body heat curled up, according to EN 13537 / ISO 23537-1. It does not correspond to comfortable use: below the limit temperature, the sleeper is likely to suffer from the cold. For real use, the comfort temperature is the main reference.
The minimum recommended temperature is the bag's comfort temperature, measured to EN 13537 / ISO 23537-1. For a 0°C bag, this means a standard sleeper can spend a night without feeling cold at 0°C, provided they use an insulated sleeping mat (minimum R-value of 2 to 3) and wear thermal base layers.
For extreme cold (below -10°C), the most suitable bags combine high-loft down (700 cuin minimum, ideally 800 cuin and above) with a mummy cut that limits heat loss. A sleeping mat with an R-value of at least 4 is essential alongside. For nights between 0°C and -5°C, a good-quality 3-season bag with a 0°C comfort rating is generally sufficient.