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Trekking Mummy Sleeping Bag - TREK 900 0°C Feather Down - Red Grey

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Trekking Mummy Sleeping Bag - TREK 900 0°C Feather Down - Red Grey
Designed in the French Alps, this RDS* certified feather sleeping bag is suitable for sleeping comfortably at temperatures above or equal to 0°C.

Sleeping bag 0°C in feather (down, 800 cuins): high-end. 945 g in size L: warm, light, compact. Mummy shape yet comfortable. Ergonomic hood. Zip with double cursor. Water-repellent.

A photo of the Trekking Mummy Sleeping Bag - TREK 900 0°C Feather Down - Red Grey in use

Optimum temperature

Comfort temperature 0°C, limit temperature -5°C

Easy transport

945 g in size L. 7.8 litre volume.2 bags: stuff bag and storage bag.

Sleeping quality

Comfortable mummy shape, ergonomic hood. Long zip with double cursor.

Water repellent

Water-repellent fabric to optimise the thermal performance of your sleeping bag.


RDS ethical down & feathers with a fill power of 800 CUIN.


non-twinnable sleeping bag


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Product Reviews

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Lightweight and really really warm!

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The temperature rating is a fantasy

I had experience using this bag in temperatures close to 0C in the UK (May) alone in a 2 man tent. It comprehensively failed to provide anything like adequate warmth in these conditions. It packs up really small and the provision of both compression sack and a large storage bag work well. The loft is impressive when you get it out of the bag. The main problem is that it has nothing like sufficient filling to provide adequate insulation at the claimed 0C. Using this in 2 season conditions (certainly no less than 8C) it would probably be fine (but strikes me as expensive for what it is). Anyone considering using this in anything like 'survival' conditions would be well advised to give it a tame test in a campsite first - I would not trust it and will be returning mine.


Lightweight and packs small. I have used the bag down to -2 degrees and it was very snug. It is also not too how in warmer times. I used it in September on a wild camping cycling trip (on my Btwin Mountain bike) The nights were quite warm but I was fine.

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Top quality Down filled sleeping bag.Comes with a separate storage airing bag for the Down to plump up whilst in storage.Smart stuff sacvfor when you are travelling.

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good quality and comfortable

I like the product. Plus its very compact.

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Brilliant sleeping bag!

I’ve used this sleeping bag for wild camps and camping. It’s so light but cosy and comfortable to give a good nights sleep. Easy to pack away he comes with a bag to store away when not in use. A great product for the price and with a sleeping bag liner could be used in much colder seasons.

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Product information



  • 10% Grey Duck Feather
  • 90% Grey Duck Down


  • 100% Polyamide

Main fabric

  • 100% Polyamide

Carry bag

  • 85% Polyester
  • 15% Polyurethane

Bag cover

  • 100% Polyester

Temperature of use:

All our sleeping bags display the temperature ratings, 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.

What are the limit temperatures for usage?

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 filled with feathers and down. The thermal insulation may drop in damp conditions.

However, this is what you need to know about temperatures:

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! These temperatures therefore depend on the person's resistance to cold (bulk, fatigue, etc.), equipment (mattress with insulation, etc.), clothing (naked, underwear, etc.) and weather conditions (humidity, wind, etc.).

For greater comfort, before getting into your sleeping bag:

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 silk or thermal sleeping bag liner to maximise warmth & hygiene inside your bag.


The mummy shape optimises thermal insulation (no loss of heat because there is not much air flow or draughts) and saves space, which means that your movements are restricted.Width at the shoulders 72 cm, height at the feet 26 cm in size L.Ergonomic hood with drawcord.Double slider, lined with an anti-cold duvet flap, side opening.H-shaped compartment structure to reduce thermal bridges.

Weight and dimensions:

Size S 750 g, user height: up to 1.60 m. Bag dimensions: Ø 15 x 34 cm.6.1 litre volume.Weight 380 g down.Size M 850 g, user height: 1.60 m to 1.70 m. Bag dimensions: Ø 16 x 34 cm.6.9 litre volume.Weight 440 g down.Size L 985 g, users between 1m70 and 1m85. Bag dimensions: Ø 17 x 34 cm.7.8 litre volume.Weight 500 g down.Size XL 1050 g, user between 1.85 m and 2 m tall.Bag dimensions: Ø 18 x 34 cm.8.7 litre volume.Weight 560 g down.

Size and thermal insulation:

Try your sleeping bag before buying it to choose the right size for your comfort.Ideally, you should not be pressed up against the fabric, at the feet or head, and the fabric should not be taut. This would create thermal bridges that lower the insulation of your sleeping bag. Conversely, a sleeping bag that is too big will be harder to heat up and will not be as good at insulating the heat generated by the body.

Size and thermal insulation (continued):

The weight, volumes & sizes may vary slightly owing to production tolerances.Volume & dimensions in the bag may vary according to the compression applied to the product.

Origin of feathers and rds certification:

Thanks to our traceability system, we can guarantee the origin of the feathers in accordance with our commitment to use responsible materials. Our suppliers are committed to using only feathers that come from ducks (Chinese origin) that are bred for their meat and which are plucked after slaughtering.We have been awarded RDS certification (Responsible Down Standard) by a third-party organisation.

The advantages of a duck down and feather filling:

The filling power of down has 3 advantages for mountain sports:- Thermal insulation thanks to the air trapped in the down and feathers- Ultra low weight: down is lighter than synthetic wadding while offering the same degree of warmth. This saves even more weight in your backpack- Ultra-compressible

How to measure the fill power of a down and feather wadding?

The fill power is a measure of the down's thermal insulation capacity and its potential to "trap" air. It is expressed in CUIN (cubic inches).So, down with a higher fill power (higher CUIN number) will occupy more space, trap more air and provide greater thermal insulation.90% duck down, 10% duck feathers.Filling Power of the down: 800 CUIN (IDFB standard)The feather filling requires special care. Follow care advice.

Care instructions

Machine wash on a delicate cycle at 30°C, wash inside out, with 3 or 4 washing balls (or clean used tennis balls). Use a detergent for feathers and down. Rinse multiple times. Spin dry on a slow and gentle cycle. Required step: Tumble dry on low heat on a delicate cycle. Finish off drying outside, ideally in the sun, on both sides to prevent the down from forming clumps. Dry thoroughly before storing.


We chose to use a so-called "biton" thread for all the grey-coloured fabrics in this sleeping bag.Textile dyeing requires a lot of water but also produces waste water from the dye baths. To reduce this impact on the environment, we chose to use a dyeing process called "bi-ton" which involves dyeing one in every two yarns. This dyed yarn is also made from a bulk dyeing process which incorporates the colour pigments from the yarn manufacturing phase onwards.


We have chosen to use a "biton" yarn in the sleeping bag lining (grey).Textile dyeing requires a lot of water but also produces waste water from the dye baths. To reduce this impact on the environment, we chose to use a dyeing process called "bi-ton" which involves dyeing one in every two yarns. This dyed yarn is also dyed using mass pigmentation, using colour pigments when the yarn is manufactured.

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