Men's Mountain Trekking Merino Wool Base Layer Tights / Leggings - MT500


Our team developed these tights, which contain Merino wool, to prevent the development of unpleasant smells.

It keeps you at the right temperature thanks to its excellent thermal regulation properties. And we use Merino wool yarn protected by a polyamide filament to improve its durability.

Color: BLACK
Size: size guide


Product benefits


Merino wool tights for extra warmth, 190 g/m2.

Abrasion resistance

Use of wool fibre surrounded by polyamide yarn for protection.

Moisture management

The high absorbency of wool helps keep the body dry

Odour control

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

Freedom of movement

We added 4% elastane for superior elasticity and support.


Merino wool is breathable and helps maintain the right body temperature.


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


Tights weigh just 191 g in size L. 190 g/sqm fabric.

Technical information

Sizing and fit

These tights have a close fit to help the transfer of moisture to the outside of the fabric.
4% elastane added for comfort and freedom of movement.

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 increase the durability of these merino wool tights?

Use of a BETA-SPUN yarn structure in which the polyamide threads coat the Merino wool fibres and protect them from rubbing and cuts without affecting their properties.

Tip before use

For a softer feel, wash your tights before first use.

How to wash my TREK 500 MERINO tights

We recommend that you machine wash your merino wool T-shirt at 30°C 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


S : 0.175 kg
M : 0.206 kg
L : 0.191 kg
XL : 0.224 kg
2XL : 0.242 kg
3XL : 0.256 kg

Product concept & technology

Product Composition

Main fabric 86% Wool, 10% Polyamide, 4% Elasthane Yoke 98% Wool, 2% Polyamide


In November 2018, 8 trekkers (4 men and 4 women) and part of the Forclaz design team, tested these tights for 4 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 Merino Wool Base Layer Tights / Leggings - MT500
Men's Mountain Trekking Merino Wool Base Layer Tights / Leggings - MT500
Men's Mountain Trekking Merino Wool Base Layer Tights / Leggings - MT500


Customer reviews


Environmental Impact

The carbon footprint of this product is:
15.01 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