Hybrid and reassuring high-altitude sleeping system
The Naturehike CW700 0-degree sleeping bag solves the classic problem of nighttime constriction. It combines a form-fitting upper body profile to prevent heat loss with a widened lower section. This geometry allows trekkers to maintain excellent leg mobility while benefiting from serious insulation when temperatures drop below freezing in the mountains.
Fill power (cuin) and fabric durability
The 700-gram RDS-certified down fill ensures a generous and consistent loft, creating a thick layer of insulating air around the sleeper. The 20D ripstop nylon shell effectively resists abrasion and features a water-repellent finish to protect the feathers from moisture. This model is the perfect companion for demanding nights where warmth and sleeping comfort should never be a compromise.
Separate toe closure
An independent zipper at the foot section allows you to ventilate that area without opening the entire bag, which is useful on nights when the temperature varies between the beginning and the end of the night in this winter sleeping bag. This feature adds to the already described slim-fit upper body / wide lower body geometry.
Hood that can be tightened snugly around the face
The hood tightens around the face to limit the area of air exchange with the outside, a setting that is particularly useful on this cold-weather sleeping bag as the comfort temperature of -1.7°C is approached, where the head becomes a proportionally more significant area of heat loss.
For those who are more demanding and wish to maintain this thermal limit of -2°C while switching to a higher quality of down (800 cuin goose down) in order to optimize compressibility, the Aegismax G2 will be the logical investment.
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 Naturehike CW700 has a comfort temperature of -1.7°C and a lower limit temperature of -7.9°C, measured to the ISO 23537 / GB/T 38426-2019 standard. These values apply under standard conditions: sleeper in thermal base layers, on an insulated sleeping mat. It is designed for hiking, bivouacking use (3-4 seasons).
The Naturehike CW700 is filled with 650 cuin. The Naturehike CW700 weighs 1070 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.