Women's Long-sleeve T-shirt Merino Wool MT500


This t-shirt contains reinforced Merino wool: 1 t-shirt for several days, zero odours. Travel light on your outings.

This material is ideal for long walks: soft and breathable, it regulates your body temperature without having to worry about odours.

Size: size guide


Product benefits

Odour control

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


Merino wool T-shirt (190 g/sqm) to provide additional warmth

Abrasion resistance

Wool fibre surrounded by polyamide yarn for protection

Moisture management

The high absorbency of wool helps keep the body dry


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


This T-Shirt weighs 215 g in size M

Technical information


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-shirt?

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.

How does the wool reduce odours from perspiration?

The components used reduce bad odours. Laboratory tested according to ISO 17299-3
This means you can carry less clothing when trekking!

Reducing the "freezing effect"

After any physical effort that involves a lot of perspiration, wool helps to preserve the body temperature while synthetic fabrics cause the temperature to drop faster.
The unpleasant cooling or "freezing effect" is therefore reduced by the merino wool.

Do you have a final word of advice before using it?

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

How do I wash my Merino wool t-shirt?

We recommend that you machine wash your Merino wool t-shirt at 30° on a normal cycle, preferably with liquid detergent.

Dry flat. NEVER tumble dry unless you want to end up with a Merino T-shirt fit only for a doll!
For more information:



2 years


0.215 kg

Product concept & technology

Product Composition

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


The Trek 500 T-shirt was tested by 9 users in the Massif des Bauges in October 2019. These testers, who are independent of Decathlon, were supported by our design teams: Maïté, our product engineer, Mélanie, our designer and myself, the product manager.
For 5 days, we tested this T-shirt together in cold, snowy conditions, with some fine days of walking and a number of nights in a bed-and-breakfast or bivouac.
We used this test to validate the product in use.

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean


Women's Long-sleeve T-shirt Merino Wool MT500
Women's Long-sleeve T-shirt Merino Wool MT500


Customer reviews


Environmental Impact

The carbon footprint of this product is:
16.15 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: C
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