Men's Mountaineering Down Jacket - Alpinism Light Blue

£79.99 −18%

This sleek down jacket offers an excellent warmth-to-weight ratio. Ideal for mountaineering in cold weather (comfort temperature rating = -10°C).

Ultra-light & compressible, it packs down into its pocket. Its ergonomic design provides excellent freedom of movement in use and the two-way zip gives easy access to the harness.

Color: Electric blue / Mahogany
Size: size guide


Product benefits


Temperature rating use = -10°C. Duck down: 90% down 10% feather

Compact design

Fill power = 800 Cuin (IDFB standard). Store the jacket in its pocket

Freedom of movement

Tight-fitting cut with armholes suitable for mountaineering.

Ease of use

Two-way zip lets you open the jacket from the bottom to access the harness.


2 hand warmer pockets, 1 chest pocket, 1 storage pocket built into the jacket.


Extend the life of your jacket with the adhesive repair patch included.

Technical information

Thermal insulation

Duck down containing 90% down and 10% feather with a fill power of 800 Cuin (IDFB standard). Jacket's assembly is partitioned, as is the hood.
Pocket volume with jacket inside: 3.5 L (Size L)

* Duck down traceability ensured by the “Responsible Down Standard” certification. This allows us to guarantee that our down comes from ducks raised for their meat, that were neither force-fed nor plucked alive:

Temperature rating use

Our jackets are lab-tested in a climatic chamber to establish the temperature ratings.
For moderate activity in 5 km/h wind, this jacket is suitable for temperatures down to -10°C.


Ultra-lightweight Jacket 380 g - Size L.
Main compo: 40 g/m²
It’s the ideal piece of clothing to put at the bottom of your bag and take out when it gets cold.

Freedom of movement

Slim fit and ergonomic design with armholes suitable for mountaineering (gullies, ice climbing, ridge climbs, ski touring).
Hood volume enabling to wear hood over the helmet

Ease of use

Two-way front zip allowing you to partially open jacket making it easier to belay and rope up.

A score to compare the environmental impact of products

The environmental impact of the product is calculated over its entire life cycle using different indicators. An overall score (ABCDE) is attributed to help you easily identify the products with the best environmental performance by comparing products of the same type with one another (t-shirts, trousers, backpacks, etc.).
Decathlon has voluntarily opted to apply this environmental labelling scheme.
For more information, visit:

Weight of down lining:

- S = 105 gr
- M = 111 gr
- L = 117 gr
- XL = 123 gr
- XXL = 130 g

Washing guidelines

CAUTION! Machine-wash your duvet jacket on its own at 30°C and with 3 or 4 tennis balls. Wring out / spin as little as possible. Dry it in the tumble-dryer with 3 or 4 tennis balls.
If you follow these recommendations, your jacket will come out as voluminous as it went in.
More information is available via the following link: Decathlon Website


2 years


S : 0.354 kg
M : 0.368 kg
L : 0.382 kg
XL : 0.42 kg
2XL : 0.45 kg

Product concept & technology

Product Composition

Main fabric 100% Polyamide Lining 100% Polyamide Padding 90% Grey Duck Down, 10% Grey Duck Feather Pocket 100% Polyamide


To ensure down inflates when jacket is not being used, store it unpacked in a dry and well-ventilated place.

Approved By

Team SIMOND mountaineers for mountain ascents, e.g.: Rochefort Ridge, Mont Blanc Massif.

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Tumble dry - low heat

Do not iron

Do not dry-clean


Men's Mountaineering Down Jacket - Alpinism Light Blue
Men's Mountaineering Down Jacket - Alpinism Light Blue
Men's Mountaineering Down Jacket - Alpinism Light Blue

Customer reviews


Environmental Impact

The carbon footprint of this product is:
13.82 kg CO2e
1 kg of CO2e represents 5km in a petrol car (according to the Base Carbone© of ADEME)
What's the carbon footprint ? We evaluate the environmental impact of all our products. At all stages of their life cycle: from the extraction of the raw material, passing through transport to the plant which transforms them, the transformation, the manufacture, the transport of the finished product, until its use and end of life. Find out more
The environmental note of this product is: B
What is the environmental note? Overall environmental score for this product in comparison to others in the same category. It is calculated based on its impact on the environment (air and water emissions, greenhouse gas emissions, depletion of natural resources) at each stage of its life cycle, according to a system managed by ADEME. Find out more