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Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's

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Model: 8501932

Product Features

Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's is designed for

Looking for a comfortable anti-odor base layer? These long-lasting reinforced Merino wool tights are ideal.

A photo of the Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's in use

Odor control

The Merino wool (86%) naturally helps prevent unpleasant odors.


Tights made of merino wool to provide an extra warm base layer

Abrasion resistant

Use of wool fiber surrounded by polyamide yarn for protection.

Moisture wicking

The high absorbency of wool helps keep the body dry


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

Freedom of movement

We have added 4% spandex for superior elasticity and support.


Tights weigh just 6.7 oz in size M. Fabric 6.7 oz/m².


Ultra-fine (18.5 microns) Merino wool. It is very soft and doesn't itch

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Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's,black 

Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's,black 

Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's,black

Product Customer Reviews

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Forclaz Trek 500, Merino Tights Backpacking Undergarment, Men's,black
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Not very affective in winter

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A very good product

This product is as my requirement. I love it.

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Excellent inner wear

Excellent inner warm wear

Not very warm

I bought these for a 10 day trip to Ladakh in October. The decathlon sales person recommended these over the basic Wedge tights and said that these would be warmer as they are made of Merino. Honestly, I didn't feel much warmth with these under the Trek 900 pants. The Wedge base layer is much warmer in my opinion. Also, the elastic band around the waist is horrible with a size S running between 87-92 cms (about 34 to 36 inches). The tights keep running down if not worn with another layer on top to secure them. I don't what size slimmer guys like me are going to get.

Hello Mr. AR
Thank you for taking out time to give your valuable feedback . We are extremely sorry for the bad experience you had. 
We generally recommend Merino wool for long trips like yours because their major benefit is that they are anti bacterial because of the type of wool you can use them for multiple days ,even upto seven days while Backpacking  or Trekking and the product won't develop  any bad odour and also they are warm.
However we really appreciate you writing us about the elastic fault and expressing your dissatisfiction, Please reach out to your nearest Decathlon store and get your product exchanged or refunded.
I hope the information was helpful, kindly write back to me in case of any further queries.  

Product Trainer and Passionate Backpacker
Muy buenas

Muy buenas y cálidas.

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Buena funcionalidad

Lo utilizo debajo de un mono de 200 gramos de buceo ( en el argot se dice "una rata") que a su vez está dentro de un traje seco trilaminado ( y yo dentro de él), en fin, como un sandwich, cuando el agua está un poco fría y me ha ido muy bien. También tengo una parte de arriba semejante. En los dos casos BBB, bueno, bonito y barato. Saludos

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Cómodas pero...

Están bien hechas y son cómodas pero creía que serían más cálidas...

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Agradecemos su valoración es muy importante para nosotros ya que nos ayuda a seguir trabajando en la mejora continua de nuestros productos.

Esperamos verle muy pronto por nuestra tienda de deportes.

Muchas gracias,


Malla de lana merina

La malla es muy cómoda y agradable . La cinturilla se dobla, no es incómoda pero creo que deberían tratar de solucionarlo , por lo demás muy bien

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Para protegerse del frío No cumple

En mi caso me las compré para complementar la indumentaria necesaria para esta época del año debido a que me desplazo en moto y paso frío con ellas puestas, en mi opinión no valen lo que cuestan ni de coña, ahí lo dejo.

Buenas tardes Eduardo,
Ante todo agradecerte tu comentario sobre las mallas de Lana Merina Trek 500 ya que nos ayuda a mejorar nuestros productos. Lamentamos que el producto no haya cubierto tus necesidades. Las características de los productos de lana merina son: termo-regulación y limitación de olores. Tienen una alta absorción del sudor, por lo tanto mantiene el cuerpo seco y con una temperatura ideal, protegiéndonos del calor y del frío. Son indicadas para usarlas en trekking o en senderismo donde la regulación térmica es acorde al calor que generamos con nuestro movimiento.
Te informamos que todos nuestros productos pasan diferentes test de calidad antes de ser comercializados y tienen 2 años de garantía. Así mismo te informamos que dispones de 60 días para probar nuestros productos desde su compra, por lo cual para poder ofrecerte una solución satisfactoria te invito a visitar tu tienda Decathlon más cercana, donde podrás exponer tu experiencia con el producto y proceder al reembolso o cambio del producto según desees.
Tu opinión será transmitida a la marca para mejora en los futuros desarrollos de nuestros productos.

Chaud et respirant

Collant sous vêtement de qualité. La laine Mérinos, toujours le top de la chaleur et de la fraîcheur. Souplesse et agréable au toucher. Tient au lavage.

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excellent produit, très bon…

excellent produit, très bon rapport qualité/prix

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confortable, de bonne qualité…

confortable, de bonne qualité

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Chaud, pas cher…

Chaud, pas cher

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Produit conforme à mes…

Produit conforme à mes attentes

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Bonjour Odile,


Bonne journée.


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Size Guide

Size Guide Visual

Additional Product Information


Main fabric

  • 86% Wool
  • 10% Polyamide
  • 4% Spandex


  • 98% Wool
  • 2% Polyamide

Sizing and fit

These tights have a close fit to help the transfer of moisture to the outside of the fabric. 4% spandex 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 practice mulesing. We decided to build a partnership with a group of breeders (Konsortium Merino) to guarantee respect for animal welfare and the environment. We have full traceability, which allows us to guarantee the origin of the wool.

How have we reinforced the durability of these merino wool tights?

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

Odor control

Wool from Merino sheep naturally controls the spread of bacteria that cause bad odors. These Merino wool tights can therefore be worn several days in a row and means you can take less clothes when backpacking making for a lighter backpack!

Tip before use

For a softer feel, wash your tights before 1st use.

How do i wash my merino wool tights?

We recommend that you machine wash your Merino wool tights at 86°F on a normal cycle, preferably with liquid detergent. Dry flat and NEVER tumble dry unless you want it to shrink by 1 or 2 sizes!



Product testing

In November 2018, 8 backpackers (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). On the agenda, 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 use for backpacking.

Superior quality. Unbeatable prices.

For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

Decathlon makes the difference
  1. product-research

    Research and development

    delivers high-quality cost-effective products

  2. State-of-the-art production processes

    minimize manufacturing costs

  3. Optimized supply chain

    reduces retail prices

  4. laptop-checkout

    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual