Men's Mountain Trekking Durable 2-in-1 Zip-Off Trousers MT500


Our team of trekker-designers developed these 2-in-1 trousers that can be easily converted into shorts to quickly react to changes in the weather.

You will love the many pockets (5) of these trousers, as well as their durability and comfort. What's more, they dry quickly.

Color: Carbon grey / BLACK
Size: size guide


Eco designed

Learn more about Eco-Designed Products.

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Product benefits


Durable fabric inserts. Ultra-durable COATS yarn for the assemblies

Freedom of movement

Stretch fabric at the seat, knees and lower legs

Quick drying

Synthetic fabrics used for their quick-drying properties


Turns into shorts without having to remove your shoes thanks to the side zips

Water repellent

The front and rear reinforcement zones are water-repellent


5 pockets closed with a zip


These trousers weigh about 460g in size 44 (L)


Dope dyeing process that reduces water consumption

Technical information

How are the dark grey and beige models eco-designed?

For the dark grey and beige colour versions of the trousers, we used a bulk-dyeing process called "dope dyeing".
This process incorporates the colour pigments from the initial thread manufacture to reduce water consumption.
As a result, we reduced the carbon emissions by 26.8% for the dark grey version and by 12.8% for beige version.

Hybrid structure

Trousers designed with 2 different components:
- a durable fabric (207 g/m²) on the areas that need protection from abrasion (seat, bottom of the legs at the front). This fabric also has stretch properties. This gives you plenty of freedom of movement.
- a lightweight and breathable fabric (125 g/m²) on the rest of the trousers.


2 zipped hand pockets
2 zipped thigh pockets (and 1 mesh patch pocket on the inside of the right pocket)
1 zipped pocket at the back
Elastic tightening system at the ankles for a perfect fit of the trousers over the boot.
Trousers sold with a belt.

What is the water repellent feature of the component?

These trousers have water repellent inserts (bottom of the legs at the front, seat) that make water run off the surface of the fabric.Please note, this does not mean WATERPROOF
The water repellent property prevents the trousers from getting wet too fast but will not keep you dry under steady rain.To do this, you will need a pair of over-trousers like the MT500 model (ref.8493660).
The water-repellent properties can be restored by warming the trousers in a tumble dryer at low heat for 10 minutes.

Sizing information

Regular cut and use of stretch fabric in the right areas guarantees high comfort levels when moving around.
Choose your usual size.

Inside leg of the trousers: 83.4 cm in size 44 (L). Inside leg of the shorts: 27.4 cm in size 36 (L)

Width of trouser hem: 21.3 cm in size 36 (L)
Width of shorts hem: 26.4 cm in size 36 (L)

What about maintenance?

Always wash the trousers with the lower legs zipped on in order to preserve a uniform colour throughout the product.

A score for comparing products' environmental impact

The environmental impact of the product is calculated based on its entire life cycle and using different indicators. An overall ABCDE score is given to help you easily identify products with the best environmental performance by comparing products of the same type (T-shirts, trousers, rucksacks, etc...). Decathlon is a voluntary supporter of this environmentally-friendly labelling approach. For more info:


2 years


UK29" FR38 (L33) : 0.438 kg
UK31" FR40 (L33) : 0.456 kg
UK32" FR42 (L33) : 0.46 kg
UK34" FR44 (L34) : 0.464 kg
UK36" FR46 (L34) : 0.49 kg
UK39" FR48 (L34) : 0.498 kg
UK41" FR50 (L34) : 0.524 kg
UK43" FR52 (L34) : 0.534 kg

Product concept & technology

Product Composition

Main fabric 100% Polyamide Yoke 88% Polyamide, 12% Elasthane Lining 100% Polyester

Approved By

These trousers, launched in 2018, were validated in the field by several people who completed the Grande Traversée des Alpes (GTA) in late spring 2017.
In 2021, it is thanks to the reviews of our customers that these trousers were improved further:
- addition of a zipped back pocket
- more durable yarn used in the assemblies
- double stitching on the back crotch

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 Durable 2-in-1 Zip-Off Trousers MT500
Men's Mountain Trekking Durable 2-in-1 Zip-Off Trousers MT500
Men's Mountain Trekking Durable 2-in-1 Zip-Off Trousers MT500
Men's Mountain Trekking Durable 2-in-1 Zip-Off Trousers MT500


Customer reviews


Environmental Impact

The carbon footprint of this product is:
23.62 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: D
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