Is it warm enough for mountaineering?

Yes. Its 800 cuin natural down keeps you warm during a bivvy and on exposed ridges when mountaineering or ski touring.

Does it stand up to rain and snow?

It is water-repellent, not waterproof. In rain or snow, wear it under a waterproof jacket.

How should you wear it?

Wear it as an insulating layer under a waterproof jacket for ascents in strong, cold winds, or as an outer layer in dry, cold weather.

Does the hood fit over a helmet?

Yes, the hood fits over a mountaineering helmet.

How many pockets does it have?

Two zipped chest pockets, accessible while wearing a harness. No inside pocket.

What down does it use?

It contains 150 g of RDS-certified, 800 cuin duck down: 95% down and 5% feathers.

Which size should I choose?

It runs slightly large: if you are between sizes, choose the smaller one.

How do I care for my natural down jacket?

Wash in cold water with a specialist liquid down detergent and no fabric softener. Dry by patting regularly to redistribute the down: ideally in the tumble dryer on a gentle cycle with tennis balls. If the down clumps together, a water-repellent treatment (Down Proof) is recommended.

What are the delivery times for this product?

If you place your order before 1 pm (excluding weekends), it will be dispatched the same day. Allow 2 to 4 working days for home delivery or collection point delivery within mainland France.

Can I return the item if the size doesn't fit?

Yes, absolutely. You have 30 days to return it and get a refund or an exchange. Return shipping is free. The item must be new, unworn, unwashed, and have its original tag.

Men's down mountaineering jacket – Meru 2

249,90 €

50 reviews

Duck Green

Delivered from Tue 27 Oct.

Free returns within 30 days

Available in several versions

Men Women

Very warm down jacket Warm down jacket

Free repairs for life

By La Réparerie, our repair service.

Complete your outfit

CLAPIER

Short-sleeved merino wool T-shirt - Men

59,90 €

WINTER GLOVES

Thermal & touchscreen gloves

29,90 €

MERU

249,90 €

50 reviews

Delivered from Tue 27 Oct.

Free returns within 30 days

Who did we design it for?

For mountaineers and skiers on hiking routes who want a warm, packable down jacket for windy conditions and a bivvy, without weighing down their pack.

How warm is it?

Warm: its 800 cuin natural down retains heat during a bivvy and on exposed ridges when mountaineering or ski touring.

How much does it weigh, and how small does it pack?

480 g in size M. Highly compressible, it packs down into a small bundle in your rucksack in seconds.

What makes it different?

Our CIMACUIN technology: RDS-certified, 800 cuin natural down that packs down into the bottom of your rucksack and insulates as soon as you put it on. An excellent warmth-to-weight ratio.

Its performance

Compressibility

Highly packable

Lightweight

480g (M)

Warmth

Wind protection

Strong wind, 60 to 90 km/h

Ideal for

Mountaineering

Ski hiking

Hiking

Ready before the wind picks up

At the start of a glacier crossing, on a bivvy or along exposed ridges: wind can quickly strip a down jacket of its warmth. You need a layer that holds its warmth without weighing you down as you move.

This down jacket holds in warmth when the wind picks up and the temperature drops. Its helmet-compatible hood and pockets accessible under a harness are designed for the climb; its two-way zip lets you belay without opening it fully.

Highly compressible, it packs down into a small bundle in your rucksack between sections, whether you're mountaineering or ski touring.

Because whatever the weather, warmth is non-negotiable.

Key features

Helmet-compatible hood

The hood is compatible with the wearing of a mountaineering helmet.

Central zip with double sliders

The central zip features two sliders. You can belay your rope partner without fully opening your jacket.

Harness-compatible pockets

The pockets have been positioned so they remain accessible even when wearing a harness.

Adjustment systems

Reliable adjustment systems to perfectly fit your down jacket.

Chest pocket

Chest pocket to keep essential items within easy reach.

CIMACUIN Technology

Natural insulation delivering excellent thermal output in cold conditions.

High fill power (cuin) : natural down creating insulating air pockets to effectively retain body heat.
Very high compressibility : compacts tightly to reduce the garment's volume and make storage easier.
Exceptional warmth-to-weight ratio: delivers optimal insulation while maintaining great lightweight performance.

CIMACUIN technology is built around down selected for its quality and durability, delivering reliable thermal performance over time.

Details

Specifications

Weight

480g (M)

Brand

Cimalp

Wind resistance

Strong wind, 60 to 90 km/h

Waterproofing

DWR water-repellent treatment

Size type

Men's Top

Traceability

Manufacturing: China
Main fabric: 100% Recycled nylon
Weaving/Knitting: China
Dyeing/Printing: China
MATERIAL CHARACTERISTICS: Product containing at least 40% recycled materials
Releases plastic microfibres into the environment when washed

Reviews

4.9

Based on 50 reviews

5

94%

4

4%

3

2%

2

0%

1

0%

Customers recommend the usual size

In summary This content is written by AI

Customers especially appreciate its lightness and warmth: they find it very warm without being heavy, pleasant to wear and comfortable. Several also praise the quality of the materials and workmanship, described as excellent, with a good length and a fit that is both roomy and shaped. The sizing is often considered accurate or perfect, but the jacket runs rather large: choose one size down if you wear few layers, or keep your usual size for layering several garments. It is well suited to outings in cold weather.

Angel.C

Verified customer

Ordered size M Ordered color Noir

Translated review

18/11/2025

I'm 1.75m tall and weigh 76kg, so I ordered sizes M and S. I ended up going with the S, which fit me better since I wear it with just a few layers. If you wear several layers underneath, the M would be better (it's not excessively large). The jacket is surprisingly lightweight, and the quality of the finish is excellent. I'm very happy with it, and the length below the waist is perfect.

bruno.m

Verified customer

Ordered size XL Ordered color Noir

Translated review

05/12/2024

Perfect product. I haven't used it much yet, but it seems to do the job: three uses in gloomy weather at 1800m. No complaints. We'll see how durable it is over time. However, I think the small bag for the down jacket is too small: it gets squashed too much, so it's better to have it neatly folded at the bottom of the bag.

Robin.B

Verified customer

Ordered size S Ordered color Bleu Canard

Translated review

14/10/2025

This down jacket is very good quality, warm, and compressible! It fits snugly around the wrists to limit drafts. As mentioned, it runs quite large.

Dagmar.W

Verified customer

Ordered size 2XL Ordered color Marron

Translated review

04/03/2025

We needed two warmer jackets and came across this company by chance. So we just ordered two down jackets. Women's size 2XL was too small, so we reordered in men's size. Fits perfectly. Men's 2XL fitted straight away. Very happy, the return went perfectly and the second order was super fast too. If we need jackets again we'll gladly order from Cimalp again. All the best

Philippe.V

Verified customer

Ordered size L Ordered color Noir

Translated review

23/01/2025

I bought three and the sizes are accurate. They're very warm and can be stored in the included pocket. I recommend them.