Men's Mountain Trekking Long-sleeved T-Shirt - MT500 MERINO ZIP


This t-shirt, which contains Merino wool, keeps the body at a pleasant temperature in all seasons. Ideal for trips lasting several days.

As a genuine comfortable and odourless base layer, this t-shirt containing reinforced Merino wool for more durability is easy to ventilate thanks to its zipped collar.

Color: BLACK
Size: size guide


Product benefits

Odour control

The component limits perspiration odours. Laboratory test ISO 17299-3.


Thermal regulation provided by the merino wool contained in this T-shirt

Moisture management

The high absorbency of wool helps keep the body dry

Abrasion resistance

Wool fibre surrounded by polyamide yarn for protection


Merino wool is breathable and helps maintain the right body temperature

Freedom of movement

The natural stretch of wool offers unrestricted movement


The T-shirt weighs just 243 g in size L. Fabric 190 g/sqm


Ultra-fine (18.5 microns) Merino wool. It is extremely soft and non-itch

Technical information

What is our commitment to animal welfare?

We only use wool from merino sheep bred on farms in South Africa that do not practise mulesing.
We decided to build a partnership with a group of breeders (Konsortium Merino) to guarantee respect for animal welfare and the environment.
This means we have full traceability, which allows us to guarantee the origin of the wool.
More information: visit our website

How did we improve the durability of our T-shirts containing merino wool?

We use a BETA-SPUN yarn structure, i.e. the merino wool fibres are coated with a fine sheath of polyamide filaments to protect them from rubbing and cuts, without affecting the properties of the wool.

Odour control

The components used reduce bad odours. Laboratory tested to standard ISO 17299-3.

Reduction of the freezing effect

After exercise and sweating heavily, Merino wool prevents evaporation helping to maintain body temperature by absorbing the majority of the body's moisture. This therefore reduces any unpleasant chilling effect.
Conversely, a synthetic material lets the body temperature go back down again faster.

Tip before use

For a softer feel, wash your t-shirt before first use.

How to wash your merino wool T-shirt?

We recommend that you machine wash your MT500 MERINO ZIP T-shirt at 30° on a normal cycle, preferably with liquid detergent.
Dry flat and NEVER tumble dry unless you want it to shrink by one or two sizes!For more information:


2 years

Product concept & technology

Product Composition

Main fabric 86% Wool, 14% Polyamide Yoke 98% Wool, 2% Polyamide


In November 2018, 8 trekkers (4 men and 4 women) and part of the Forclaz design team tested this T-shirt for four days in the Southern French Alps (Lus La Croix Haute). You can expect wind, rain, a bit of snow, a bivouac... and a lot of fun! We were then able to make the final modifications and validate it for mountain trekking use.

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean


Men's Mountain Trekking Long-sleeved T-Shirt - MT500 MERINO ZIP
Men's Mountain Trekking Long-sleeved T-Shirt - MT500 MERINO ZIP
Men's Mountain Trekking Long-sleeved T-Shirt - MT500 MERINO ZIP

Customer reviews


Environmental Impact

The carbon footprint of this product is:
26.75 kg CO2e
1 kg of CO2e represents 5km in a petrol car (according to the Base Carbone© of ADEME)
What's the carbon footprint ? We evaluate the environmental impact of all our products. At all stages of their life cycle: from the extraction of the raw material, passing through transport to the plant which transforms them, the transformation, the manufacture, the transport of the finished product, until its use and end of life. Find out more
The environmental note of this product is: E
What is the environmental note? Overall environmental score for this product in comparison to others in the same category. It is calculated based on its impact on the environment (air and water emissions, greenhouse gas emissions, depletion of natural resources) at each stage of its life cycle, according to a system managed by ADEME. Find out more