Trekking Sleeping Bag - MT900 10°C - Down

Ref. : 8575969

This 2 season sleeping bag with RDS-certified* down and feathers lets you sleep comfortably at temperatures above or equal to 10°C.

This sleeping bag is warm and light thanks to the loft (800 CUIN) of the down used, and is also very compressible. Mummy shape and adjustable hood with good coverage and a drawstring.

Color: granit grey / teal blue

  • M undefined
  • L undefined
  • XL Out of Stock

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  • Free delivery for Decathlon brands orders above $399
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Products benefits

Optimum temperature

Comfort temperature 10°C, limit temperature 5°C

Easy transport

For size L. Weight: 700 g. Volume: 4,9 litres. Stuff Bag

Sleeping quality

Mummy shape, anatomical hood. 1 long zip on the left with a double slider

Water repellent

Outer surface of the fabric is treated so that water runs off the surface


RDS ethical down with a fill power of 800 CUIN


non-twinnable sleeping bag


Trekking Sleeping Bag - MT900 10°C - Down
Trekking Sleeping Bag - MT900 10°C - Down
Trekking Sleeping Bag - MT900 10°C - Down

Technical information

What is the temperature rating?

We display on all our sleeping bags the comfort temperatures tested by an independent laboratory (AITEX) according to European standard ISO 23537-1 of 21/01/2017. The comfort temperature rating is the lower limit at which the user in relaxed posture is generally in thermal equilibrium and feels neither too cold nor too hot (for a standard woman in normal conditions of use). Choose your sleeping bag according to this criterion.

What is the temperature rating (lower limit at which you feel comfortable)?

The comfort limit temperature is the temperature limit at which a person curled up in the sleeping bag is in general thermal equilibrium, neither too cold nor too hot (determined for a man in normal conditions of use).We recommend using an insulation mattress to optimise your thermal comfort.

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! Your thermal comfort will therefore depend not only on climatic conditions (humidity, wind, etc.) but also on your sensitivity to cold (fatigue, etc.), your equipment (insulating mattress, etc.) and your clothing (naked, underwear, etc.)

Some advice to consider before you get into your bag

Dress simply (1 layer of clothing is enough). Warm-up your extremities: hats, gloves, socks, hand/feet warmers, rubdowns, etc. A flask of hot water can be used as a hot water bottle (as long as there's no chance of it accidentally opening!)
Contract your muscles (70% of the energy consumed is converted into heat) but do it without moving as this could create a draught.
Use a bag liner to optimise warmth and avoid washing your sleeping bag too frequently.


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 73 cm, height at the feet 27 cm in size L.

Weight and dimensions

Size S: 560 g, user up to 1.59 m. Bag dimensions: Ø 12 x 34 cm. Volume 3.5 L. 260 g down/feathers.
Size M: 615 g, user between 1.6 m and 1.69 m. Bag dimensions: Ø 13 x 34 cm. Volume 4.2 L. 260 g down/feathers.
Size L: 700 g, user between 1.7 m and 1.84 m. Bag dimensions: Ø 14 x 34 cm. Volume 4.9 L. 300 g down/feathers.
Size XL: 775 g, user between 1.85 m and 2 m. Bag dimensions: Ø 15 x 34 cm. Volume 5.6 L. 340 g down/feathers.


Anatomical hood with good coverage and drawstring adjustment.
A baffle along the zip prevents heat loss.
Double-slider zips for optimal ventilation.
X-shaped compartmented structure, through-stitching.

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.

This 90% down/10% feather sleeping bag has a guaranteed fill power of at least 800 CUIN (European standard).

What is RDS certification?

RDS or “Responsible Down Standard” is a worldwide certification issued by an independent organisation to volunteer brands.
This standard enables us to guarantee the origin of the feathers in accordance with our commitment to use responsible materials. Our suppliers commit to using only feathers from geese and ducks raised for their meat and slaughtered before down and feathers are collected.
To find out more:


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 use only mass pigmentation of one yarn out of every two (Bi-ton), and thus reduce our consumption and our impact on water.

How to maintain a down sleeping bag?

Even if you regularly use a bag liner, you will need to wash your down bag from time to time. Follow our guidance by copying the link below:
In short:
1/ machine wash, 30°, with 2 or 3 tennis balls. Gentle spin cycle.
Use special detergent for washing down (ref: 8609821)

2/ tumble dry with 2 or 3 tennis balls, and repeat 2 or 3 times until it is completely dry.

How to repair your sleeping bag

On a trek, you can snag a sleeping bag, it happens! The good news is that it can be repaired to prevent the tear from getting bigger and the feathers from escaping.
To do this, we recommend that you use self-adhesive repair patches (ref: 8584596) or ask one of our technicians to do this for you in the workshop of your Decathlon store.

Find out more:


This sleeping bag is guaranteed for a period of 5 years from the date of sale indicated on the receipt. The product covered by the guarantee will be repaired or exchanged free of charge. The warranty covers product defects excluding any resulting from normal wear and tear and those resulting from abnormal use. The product and sales receipt are required for this special 5-year warranty to be valid.


5 years


M : 0.62 kg
L : 0.7 kg
XL : 0.78 kg

Product concept & technology

Product Composition

Filling 90% Grey Duck Down, 10% Grey Duck Feather Lining 100% Polyamide Shell 100% Polyamide Carry bag 85% Polyester, 15% Polyurethane Bag cover 100% Polyester


To maintain its fill power, which is necessary for its insulation properties, store your sleeping bag by stuffing it in the mesh bag provided, feet first. Can be stored flat.

User Restrictions

Cannot be twinned.

Maintenance advice

Machine wash - 30° max - gentle

Do not bleach

Tumble dry - low heat

Do not iron

Do not dry-clean

User reviews

Questions & Answers