Which size should I choose?

Choose your usual size and check it against the size guide on the product page. The fit is close and the high collar sits snugly around the neck: size up for more room.

How cold can it be worn in?

Some customers wear it at around 0 °C under a lightweight jacket. It is designed for the coldest winter days and long stops. Add a fleece over it for even more warmth. For sustained effort in milder weather, our single-fabric base layer is enough.

What is it made from?

It combines two hollow-fibre fabrics made from 100% polyester, weighing 175 and 165 g/m², with no wool. The material dries quickly and stands up well to repeated use.

What should you wear underneath and over it?

Nothing underneath: wear it next to your skin. A cotton t-shirt traps moisture and leaves you cold when you stop. Over it, add a fleece or insulated jacket in extreme cold, then a waterproof jacket to protect against wind and bad weather.

Does it limit odours?

Yes. POLYGIENE® StayFresh technology limits the growth of bacteria responsible for unpleasant odours, so you can wash it less often. It does not replace washing, especially after a particularly sweaty outing.

Zip neck or crew neck: which should I choose?

The half-zip protects your neck when closed and opens for ventilation on climbs. The crew-neck version, selectable using the buttons on the product page, fits under a neck warmer without adding volume.

How should I wash this thermal top?

Wash it at no more than 30 °C without fabric softener: softener blocks the fabric’s micropores and reduces its ability to wick away sweat. Leave it to air-dry; it dries quickly. Avoid tumble-drying.

What are the delivery times for this product?

All orders placed by midnight are prepared the next day. In France, orders placed before 1 pm (excluding weekends) with Chronopost 24h are dispatched the same day. Delivery then depends on the carrier and takes 1 to 4 days in France. Delivery times for Europe and the rest of the world vary by destination.

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.

Very warm men's thermal top - X-Warm Zip 5

69,90 €

10 reviews

Insulating

Stretch

290 g (size M)

Navy

Delivered from Thu 12 Nov.

Free returns within 30 days

Available in several versions

Men Women

Crew neck Half-zip

Free repairs for life

By La Réparerie, our repair service.

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69,90 €

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Free returns within 30 days

Who did we design it for?

For men heading out in very low temperatures for mountaineering, ski touring or long snowshoe trips, who won’t compromise on thermal insulation.

How warm are they?

Very warm. Two insulating fabrics weighing 175 and 165 g/m², plus the hollow fibres of our CIMATHERM® technology, retain heat even during stops in extreme cold.

How does it manage moisture?

The fabric wicks away sweat and dries quickly, so it does not stay damp against your skin when you stop moving.

What makes it different?

Two insulating fabrics and a zipped high collar: closed, it protects your neck from the cold; open, it lets heat escape on climbs.

Its performance

Drying time

Very fast

Durability

Highly durable fabric

Stretch

Stretch fabric

Warmth

Very warm

Ideal for

Alpine skiing

Cross-country skiing

Ski hiking

Hiking

Snowshoes

Freeride

Mountaineering

The warm top you can unzip in one move

Some days, the conditions change everything. Sub-zero temperatures, strong winds, long hours of exposure. This top was designed for those days: two insulating fabrics retain warmth while wicking away moisture during exertion.

The zipped high collar is the final barrier against cold air entering at the neckline. One quick adjustment: collar closed, neck protected.

Its close fit sits beneath any technical layer, fleece, insulated jacket or ski jacket, without adding volume.

Key features

Bi-material construction

- Double thermal barrier to tackle extreme cold conditions.

Stretch fabric

- No restriction of movement thanks to its stretch fabric.

POLYGIENE® StayFresh technology

CIMATHERM® Technology

Contrôle durable des odeurs pour un confort prolongé pendant l’activité.

Technologie anti-odeurs : limite le développement des bactéries responsables des mauvaises odeurs.
Entretien réduit : permet d’espacer les lavages et de prolonger l’usage du vêtement.
Confort préservé : traitement intégré qui n’altère ni la respirabilité ni le toucher du textile.

Développée par Polygiene®, spécialiste des technologies de contrôle des odeurs, la technologie POLYGIENE® STAYFRESH™ assure durabilité et efficacité dans le temps.

Targeted warmth suited to activities in cool conditions.

Effective insulation : retains body heat during outings in cool weather.
durable Thermal Comfort : maintains a good thermal balance, both in motion and during rest phases.
Soft-touch fabric : comfortable to wear, even during extended use.

CIMATHERM technology favours resistant materials to ensure durability and long-lasting thermal performance over time.

Details

Specifications

Weight

290g (M)

Brand

Cimalp

Fabrics

Main fabric: 100% Polyester; secondary fabric: 100% Polyester

Insulation

Very warm

Size type

Men's Top

Traceability

Product sheet on environmental qualities and characteristics
Manufacturing: China
Weaving/Knitting: China
Dyeing/Printing: China
Releases plastic microfibres into the environment during washing

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Reviews

4.7

Based on 10 reviews

5

70%

4

30%

3

0%

2

0%

1

0%

Customers recommend the usual size

Comfort

Warmth

Breathability

In summary This content is written by AI

Customers are won over by this base layer’s warmth, comfort and breathability, and also praise its well-designed, technical construction. Several find it pleasant to wear, while some point out that it stays warm without feeling stifling. Used while stationary, it “does the job”, and one customer feels they have found a high-quality product that suits them. Feedback on sizing is mixed: some find it true to size, while another recommends going one size up.

Jean F.

Verified customer

Height 170cm Usually wears M Ordered size M Ordered color Noir Usage Randonnée

Translated review

07/10/2026

Comfortable, warm and breathable.

Lydie.B

Verified customer

Ordered size 2XL Ordered color Noir

Translated review

17/01/2026

Excellent technical item. Order one size up from your usual size.