What should I wear underneath this garment?

To maximise warmth without building up condensation, wear a breathable technical base layer (synthetic fibres or merino wool) as your first layer.

Does this model offer effective protection against rain?

This garment acts as a thermal second layer: its role is to trap air and retain your body heat. While it can handle a light drizzle, it is not waterproof. In heavy rain or freezing wind, adding a waterproof jacket (third layer) over the top is essential.

How do I wash this fleece to prevent pilling?

We recommend machine washing at 30°C, ideally inside out. Avoid the tumble dryer and leave it to air dry to preserve the softness and loft of the thermal fibres over time.

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.

Lightweight Breathable Half-zip Trail Top Men

48,90 €

69,90 €

-30%

18 reviews

Almond green

Delivered between 19 - 22 Oct.

Free returns within 30 days

Available in several versions

Men Women

Free repairs for life

A repaired garment is a story extended. We ensure the longevity of your Cimalp equipment, season after season.

Complete your outfit

ORPIERRE

Stretch and resistant polyamide/cotton Trousers - Men

84,90 €

AOSTE

Resistant trail shorts with integrated inner shorts and multi-pocket waistband - Men's

69,90 €

MUSAN

48,90 €

69,90 €

-30%

18 reviews

Delivered between 19 - 22 Oct.

Free returns within 30 days

Who did we design it for?

For the traileurs who rack up elevation gains, from interval sessions in the forest to mountain races in cool conditions.

You know that moment when the early morning chill bites in the first kilometres, then the heat builds fast on the singletrack. You need a mid layer that keeps up with these swings without slowing you down.

This top was designed for those who want a calibrated thermal input without compromising on breathability and the freedom of movement at full effort.

How should you wear it?

Worn as a mid layer over a breathable technical base layer.

Regular fit — we recommend your usual size.

What makes the difference?

Its lightweight makes it a mid-layer you forget you're wearing. Compliant with the mandatory kit requirements for ultra-trail events, it delivers a reliable thermal output without ever weighing down your pack.

Its performance

Breathability

Durability

Lightweight fabric

Stretch

Stretch fabric

Warmth

Warm

Ideal for

Trail running

The mid-layer that weighs nothing

When trail starts in the cold, every layer counts. Too heavy and it slows you down. Not breathable enough and it soaks through. Between climbs and windy ridges, regulation must be immediate.

The MUSAN was designed to follow every variation in intensity. It delivers the warmth you need in the first cool kilometres, then expels excess heat as effort kicks in. Its stretch construction moves with you without restriction. Under a pack or vest, it stays invisible — 202 g you no longer feel.

Compliant with mandatory equipment requirements for ultra-trail, it meets a simple standard: protect without getting in the way.

Because on long races, every gram has a cost. And the best mid-layer is the one that knows how to disappear.

Key features

Half-zip

- Lets you regulate perceived warmth.

Fitted high collar

- Protects the neck when the wind picks up.

Fitted stretch fit

– Zero riding up under the gilet or jacket.

Apport de chaleur maîtrisé

- Tissu apportant chaleur sans surchauffe.

Ultra-light

Stretch

Breathable

Ultra-light

Stretch

Breathable

Ultra-light

Stretch

Breathable

Ultra-light

Stretch

Breathable

CIMAFLEX Technology

Freedom of movement and light protection for outdoor activities.

Comfortable stretch: stretch fabric that follows natural movements without restriction.
Water-repellent protection: limits the penetration of light moisture and splashes.
Easy to wear: comfortable material that promotes ease of movement during outdoor activities.

CIMAFLEX technology prioritises durable materials to ensure long-lasting performance and shape retention over time.

Specifications

Weight

202g (M)

Brand

Cimalp

Breathability

Total breathability

Insulation

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

Reviews

4.6

Based on 18 reviews

5

88%

4

0%

3

0%

2

0%

1

11%

Customers recommend the usual size

In summary This content is written by AI

Customers appreciate its breathability and effective sweat-wicking, particularly for running and trail outings. They also praise a lightweight, comfortable, soft-feeling garment that provides enough warmth for spring or autumn evenings and nights. The colour is widely appreciated, and some customers highlight its excellent value for money. However, sizing can vary: it feels too close-fitting for some and too large for another customer, so check the size carefully before choosing.

Ricky.D

Verified customer

Ordered size S Ordered color Bleu

Translated review

03/04/2026

Excellent product for spring and autumn evenings and nights while maintaining excellent breathability. Very satisfied.

Damien.M

Verified customer

Ordered size M Ordered color Vert Amande

Translated review

03/12/2025

Ideal second layer for running and trail running perfect size. Very comfortable and highly technical for breathability.