All our sleeping bags display the temperature rating and limit temperature, tested by an independent laboratory (AITEX), in accordance with the European standard NF ISO 23537 - 2017. The "comfort temperature" is the lower comfort limit at which a user in relaxed position is in overall thermal balance and is neither hot nor cold (determined for an average woman in normal conditions of use). Choose your sleeping bag according to this criterion.

Limit temperature: temperature limit at which the user of the sleeping bag in huddled-up position is generally in thermal equilibrium and is neither cold nor hot (determined for a standard man under normal conditions of use).We recommend using an insulation mattress to optimise your thermal comfort. This sleeping bag is lined with synthetic wadding to ensure its performance even in wet conditions.

A sleeping bag does not produce heat but retains the heat produced by the body. If you are tired and cold and you slip inside a cold, damp sleeping bag, it is very likely that you will feel cold no matter how good your sleeping bag is! During the night, your thermal comfort will therefore depend not only on climatic conditions (humidity, wind, etc.) but also on your physical condition, your equipment (mattress, etc.) and your clothing (woollen underwear, etc.)

Dress simply (1 layer of clothing is enough). Warm-up your extremities: use hats, gloves, socks, bed warmers, rubbing, etc. A flask filled with hot water can be used as a foot or bed warmer (so long as there's no chance of it opening by accident!) Contract your muscles (70% of the energy consumed is converted into heat) but without making any movement generating a cold airstream. Use a sleeping bag liner to maximise the heat and hygiene inside your sleeping bag.

A generous mummy shape that is wide at the shoulders and narrow at the feet to optimise thermal insulation (no heat loss) and make the product more compact, while maintaining some freedom of movement. Width at the shoulders 72 cm, height at the feet 34 cm in size L. 64/30 in S, 68/32 in M, 76/36 in XL. Ergonomic hood; Drawcord. Two double-slider side zips, lined with a flap (tube) in anti-cold wadding (thermal bridges), side openings. Easy mechanical ventilation.

Size S 1.45 g, user up to 1.59m tall. Bag dimensions: L 42 cm Ø 19.5 cm. 12.5 litre volume. Size M 1.55 g, user from 1.60 and 1.69m tall. Bag dim.: L 42 cm Ø 20.5 cm. 13.9 litre volume. Size L 1.67 g, user from 1.70 to 1.84m tall. Bag dim.: L 42 cm Ø 21.5 cm. 15.2 litre volume. Size XL: 1.79g, user from 1.85 to 2m tall. Bag dim.: L 42 cm Ø 22.5 cm. Volume 16,7 L. Volume & dimensions may vary according to the compression applied to the product.

The weight, volumes & sizes may vary slightly owing to production tolerances. Try your sleeping bag before buying it to choose the right size for your comfort.The point of a mummy-shaped sleeping bag is to optimise the insulation/weight/volume ratio. Indeed, with a bag that fits close to the body, you will have less volume to heat (saving your energy). Conversely, this type of bag can limit your freedom of movement, especially when the zips are closed.

Can be twinned with all the Forclaz Trek 500 sleeping bag models. Can be twinned with the older models in the 2017 "Ultralight" and 2018 "Light" ranges.