Can I wear a cotton t-shirt underneath?

This is strongly inadvisable. Cotton retains moisture and dries very slowly, leaving you feeling cold during rest stops. Wear this technical garment directly against your skin.

What should I wear over this garment?

This model is designed to act as a second skin. Its role is to wick away moisture and keep you dry. If it's cold, add a fleece on top (second layer). To protect yourself from the elements, wear a waterproof jacket as your third layer.

How should I wash this garment to preserve its breathability?

Wash at a maximum of 30°C. The golden rule for sportswear is to avoid fabric softener: it clogs the micro-pores of the fabric and blocks moisture wicking. Air drying is very quick — avoid the tumble dryer.

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 extra-warm technical base layer with crew neck

59,90 €

7 reviews

Black

Delivered from Tue 27 Oct.

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

MERINO SOCKS

Warm merino wool socks

19,90 €

CLAPIER

Short-sleeved merino wool T-shirt - Men

59,90 €

X-WARM TOP

59,90 €

7 reviews

Delivered from Tue 27 Oct.

Free returns within 30 days

Who did we design it for?

For the winter hikers and mountaineers who take on the harshest mountain cold, from glacial ascents to winter expeditions.

They alternate between sustained effort and wind-exposed rest stops, where thermal management is what determines performance.

This profile demands a base layer capable of keep the body warm even when the effort pauses.

How should you wear it?

To be worn as a base layer directly on the skin to optimise moisture transfer. Layer a thermal fleece in extreme cold, and a hardshell jacket in wind or precipitation. Second-skin fitted cut — your usual size.

What makes the difference?

Its dual insulating construction at 285g delivers the level of warmth that extreme high-mountain conditions demand, without ever blocking active moisture evacuation. A thermal balance maintained from the ascent to the bivvy.

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

Insulation that stands up to extreme cold

In high mountains, temperatures drop below zero before you even set off. An inadequate base layer turns every stop into an ordeal: the cold seeps in, moisture lingers, effort becomes risk.

This base layer was designed for the most hostile conditions. Its double insulation captures and retains body heat while actively transferring moisture outward. It neutralises odours over time, maintaining stable thermal comfort from the ascent to the bivvy.

Because extreme cold makes no compromises. Neither does your base layer.

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

285g (M)

Brand

Cimalp

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