Which size should I choose?

Choose your usual size and check it against the size guide on the product page. The fit is close to the skin: some customers find it snug at the shoulders, so 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?

Wear nothing underneath: put it directly against your skin. A cotton t-shirt traps moisture and leaves you cold during stops. In extreme cold, add a fleece over it, then a waterproof jacket for protection 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.

Crew neck or half-zip: which should you choose?

The crew neck fits under a neck gaiter and other layers without adding volume. The half-zip version, available via the options on the product page, protects your neck when closed and opens for ventilation on climbs.

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.

Women’s extreme-cold base layer - X-Warm Top 5

59,90 €

36 reviews

Insulating

Stretch

200 g (size S)

Sky

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.

Complete your outfit

SLOPE

Very warm merino and acrylic ski socks

22,90 €

MERINO SOCKS

Warm merino wool socks

19,90 €

X-WARM TOP

59,90 €

36 reviews

Delivered from Thu 12 Nov.

Free returns within 30 days

Who did we design it for?

For mountaineers and women hiking in winter who head out in very low temperatures, alternate intense efforts with stops exposed to the cold, and want to stay warm when stationary.

How warm are they?

Very warm. Two insulating fabrics of 175 and 165 g/m² and 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?

Its two insulating fabrics provide more warmth than a single-fabric first layer without preventing sweat from escaping.

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

Warmth that never lets go

In the high mountains, extreme cold sets in as soon as you stop. Moisture built up during exertion feels icy at the summit: if your first layer cannot keep up, your thermal comfort suffers.

This base layer combines two insulating fabrics that retain body heat while moving moisture from exertion away from the skin. It moves with you without chafing and limits odours over time.

Because good insulation starts next to the skin. It is the foundation for every layer that follows.

Key features

Stretch fabric

No movement restrictions thanks to its stretch fabric

Dual-fabric construction

- Double thermal barrier to tackle extreme cold conditions.

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

200g (S)

Brand

Cimalp

Fabrics

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

Insulation

Very warm

Size type

Women's Top

Traceability

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

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Reviews

5.0

Based on 36 reviews

5

100%

4

0%

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 its warmth and comfort: many find it soft, pleasant to wear and effective as a base layer without being too hot. Several also appreciate how lightweight it is and have worn it skiing, snowshoeing, trail running, in a mountain refuge or in Norway; one customer stayed warm at 0°C with a hoodie and a light jacket. Be aware that the fit is often considered quite tight or small: choose one size up if you are between sizes.

Pascale.R

Verified customer

Ordered size S Ordered color Bleu

Translated review

06/02/2025

Il est très chaud et confortable. La couleur est conforme à la photo. Je mesure 164 cm et pèse 57 kg. La taille S est un peu juste au niveau des épaules. J'ai déjà pris une taille M et je pense me situer entre les deux tailles.

Christine.M

Verified customer

Ordered size S Ordered color Bleu

Translated review

10/01/2025

Perfect for winter outings with snowshoes or skiing, very comfortable and warm, good fit.

Ignace.A

Verified customer

Ordered size S Ordered color Noir

Translated review

25/12/2024

Parcel received on time, it's perfect, it's neat, it's fast, top quality clothing, I recommend it, went out in 0 degrees with a hoodue and a light jacket, I stayed warm, effective clothing, thank you Cimalp.

Brigitte.H

Verified customer

Ordered size L Ordered color Noir

Translated review

29/01/2025

Excellent base layer, warm but not too hot.

Veronique.L

Verified customer

Ordered size S Ordered color Noir

Translated review

21/01/2025

The article tested in Norway keeps warm and has a beautiful feminine cut.