Which size should I choose?

Choose your usual size. Sizes are combined (S/M, L/XL, 2XL/3XL), and the fabric stretches; the size guide on the product page gives the height and weight for each size.

Is it enough for skiing and extreme cold?

When active, it's suitable down to around -5 °C under a jacket. When you stop, it may feel too light at 5 °C: add a fleece.

What should I wear over it?

Wear it against your skin as a base layer. In cold weather, add a fleece over it. For rain, finish with a waterproof jacket.

Can I wear a cotton t-shirt underneath?

We don’t recommend it. Cotton holds moisture and dries slowly, leaving you cold when you stop. Wear this top directly against your skin.

Is it made entirely of silk?

No: it contains 6.4% silk, blended with bamboo viscose, polyester and elastane. The blend gives it a soft feel and stretch.

Does it retain odours?

Its POLYGIENE® treatment limits the growth of odour-causing bacteria, so you can wear it on several outings before washing it. How many days depends on how hard you work and how warm it is.

It weighs 325g in size M. It’s not the lightest base layer, so bear that in mind if every gram in your pack counts.

How should I wash it?

Wash at 30 °C maximum, without fabric softener: it clogs the fabric’s micropores and slows the release of sweat. Air-dry it and 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.

Men’s thermal base layer - Strategic Top 5

49,90 €

435 reviews

Insulating

Antibacterial

Breathable

325 g (size M)

Black / blue

Delivered from Thu 12 Nov.

Free returns within 30 days

Available in several versions

Men Women

Free repairs for life

By La Réparerie, our repair service.

Complete your outfit

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2-in-1 thermal balaclava, helmet-compatible

24,90 €

STRATEGIC TOP

49,90 €

435 reviews

Delivered from Thu 12 Nov.

Free returns within 30 days

Who did we design it for?

For men who ski, hike or go snowshoeing in winter and want a warm, soft base layer to wear all day.

How warm are they?

Rated warm: a base layer for cold days when you're active. When you stop or in extreme cold, add a fleece over it.

How comfortable is it?

A stretchy seamless knit that moves with you. Bamboo viscose and 6.4% silk make it soft against the skin.

What makes it different?

Our CIMATHERM® Stretch technology combines warmth and freedom of movement, with targeted insulation zones. POLYGIENE® treatment limits odours between outings.

Its performance

Drying time

Very fast

Durability

Highly durable fabric

Stretch

Stretch fabric

Warmth

Warm

Ideal for

Alpine skiing

Cross-country skiing

Ski hiking

Hiking

Snowshoes

Fast hiking

Leisure walking

Mountaineering

The top that prevents harness chafing

A top you barely notice you’re wearing. Its seamless knit fits close to the body and reduces friction against the skin, even after a full day with a pack on.

Bamboo viscose and silk bring a softness rarely found in a technical base layer. Not a synthetic feel you put up with, but one you choose.

Whether you’re moving or taking a break, the stretch fabric follows your movements and keeps warmth close to your body as you ski, hike or rope up.

A base layer goes on in the morning and stays out of mind until evening.

Key features

Seamless knit

Seamless knit designed to reduce chafing.

Integrated silk

6.4% silk in the knit for softness from the first touch.

Thermal body mapping

Targeted insulation zones for different parts of the body, visible in the knit.

CIMATHERM® Stretch Technology

POLYGIENE® StayFresh technology

Warmth and freedom of movement for active pursuits in cool conditions.

Effective thermal insulation : retains body heat during effort.
Multi-directional stretch: stretchy fabric that moves with you without restriction.
Comfort in motion : suited to dynamic activities requiring freedom of movement and thermal regulation.

CIMATHERM® STRETCH technology prioritises resistant materials to ensure durability and lasting performance over time.

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.

Details

Specifications

Weight

325g (M)

Brand

Cimalp

Fabrics

62.9% bamboo viscose, 27.9% Polyester, 6.4% silk, 2.8% elastane

Insulation

Warm

Size type

Men's Top

Traceability

Product sheet relating to 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

4.9

Based on 435 reviews

5

94%

4

4%

3

0%

2

0%

1

0%

Customers recommend the usual size

Comfort

Warmth

Breathability

In summary This content is written by AI

Customers first appreciate its warmth, which they find highly effective even in cold wind and during winter activities. Many also highlight its outstanding comfort, soft fabric and a garment that feels almost unnoticeable, while several praise its breathability, quick drying and lack of odour after exercise. Its comfortable fit, extra length that covers the lower back well and light weight are also mentioned. Customers use it for alpine skiing, ski touring, high-altitude trekking, hiking and mountain biking.

Rau.K

Verified customer

Ordered size L/XL Ordered color Noir / Gris

04/02/2024

I like the strech and soft feel in the material. I was expecting a bit thicker and warmer material, I think this will do fine until -10C with Cimalp Softshell ski trousers.

Jean-François.M

Verified customer

Ordered size S/M Ordered color Noir / Bleu

Translated review

23/01/2026

At 1.83m tall, the L/XL size fits me perfectly. Very comfortable base layer. My uses: Alpine skiing / Ski touring / High-altitude trekking Highly recommended!

MARC.W

Verified customer

Ordered size L/XL Ordered color Noir / Gris

Translated review

07/02/2024

The STRATEGIC TOP 5 H is my go-to base layer for long bike rides. The L/XL size fits me perfectly (1.78 m, 80 kg). It fits my torso snugly without being too tight. The bamboo rayon used primarily in its construction is a wise choice.

Angel.L

Verified customer

Ordered size S/M Ordered color Noir / Bleu

Translated review

15/12/2023

Size maybe a touch large, but as I was between the two it fits me perfectly. (I'm 1.73 m and 68 kg, I took S/M.) The material is very pleasant. I don't know if it's normal, but I find it has an anti-odour side, which is great. Never had a wet feeling even during intense effort. I can only recommend it

Jean-Michel L.

Verified customer

Height 178cm Usually wears L Ordered size L/XL Ordered color Noir / gris Usage Randonnée

Translated review

09/11/2026

Very pleasant thermal base layer. Comfort and warmth are excellent. Even after sweating, it doesn't feel unpleasant like a regular t-shirt would.