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Men's Long-sleeve Undyed Merino Wool T-shirt - MT500

Sale price: $50.00 Regular price: $69.99

This T-shirt allows you to trek for a long time without worrying about perspiration odours. You can travel with a lighter backpack!

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Sale price: $50.00 Regular price: $69.99

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San Francisco, 735 Market St. Options

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Model: 8607337

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Product Features

Men's Long-sleeve Undyed Merino Wool T-shirt - MT500 | This Merino wool t-shirt is the undyed version of our MT500 Merino model. This reduces its CO2 impact by 25%!

This T-shirt allows you to trek for a long time without worrying about perspiration odours. You can travel with a lighter backpack!

A photo of the Men's Long-sleeve Undyed Merino Wool T-shirt - MT500 in use

Odor control

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


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

Abrasion resistant

Wool fibre surrounded by polyamide yarn for protection

Moisture wicking

The high absorption capacity of the wool removes the feeling of dampness


Merino wool is breathable, stays warm in winter and wicks away moisture in summer


Ultra-fine (18.5 microns) Merino wool. It is soft and pleasant to wear


The T-shirt weighs just 222 g in size L. Fabric 190 g/sqm

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Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee 

Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee 

Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee 

Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee 

Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee

Questions & Answers

Product Customer Reviews

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Men's Long-sleeve Undyed Merino Wool T-shirt - MT500,iced coffee
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Comfortable but SEE THROUGH! ,


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The BL is made up by attaching pieces of fabrics which has resulted in stitch lines all over body and arms that doesn't feel good. I mean, its directly worn on skin and is supposed to be comfortable. It feels all rough due to friction caused by infinite stitches

Hi Soham

Thank you for providing feedback on your experience. we are sorry that the product did not match your experience and we are sorry for the same

I will help you with the concern but here I need your help with this scenario.

Can you please update me-

Type of usage= Example - Daily, Running, trekking, Hiking, Bike Rides

Time of Usage = 2-4hrs , 4-6hrs, 6+ hrs

With the above details, I can help you better with your concern.

Feel free to write back to me.

rough and itchy

I got two mt500 undyed t-shirt delivered today. It feel rough to wear. It is not smooth. It is also itchy. I am not satisfied with this product. I rather go for tropical 900 merino wool t-shirt, which is very smooth and lightweight.

Hi Elangovan

Thank you for your reviews and we are sorry that you are disappointed with some factors about the product.

Kindly return the product to the nearest decathlon store(t&c- if the product is not used and is under the 30 days retune policy) if you have experienced the above-mentioned issue. All online orders can be dropped back to a store and yet you can receive 100% cash back on the mode of payment.

Please let me know the Queries are satisfied, If not kindly get back to me for the same.




Habe dieses Shirt für Fr. 50.- gekauft am 04.02.2022, es ist superbequem und angenehm zu tragen. Wollte es 23.04.2022 nachbestellen und nun kostet es Fr. 65.-... ?! Kann das nicht nachvollziehen, denn die gefärbten, identischen Shirts hatten keinen Preisaufschlag von gut 30%... Naja ändert nichts daran, dass es ein gutes Shirt ist.

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Merino Shirt

Also Top Produkte hatte vor 4 Wochen 1 bestellt zum Testen . Hatte es bei 50 km marsch an der Ostsee an und nur die gute Forcalz Jacke drüber bei um die 0 Grad. Mit leiten Regen und mal Schnee. Bin sehr zufrieden und gleich noch 2 bestellt.

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Merino Shirt Trek 500 langarm

Super Qualität, hat bisher meinen Erwartungen entsprochen. Sehr gerne Wieder, 5 von 5 Sternen

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Top Teil!

Passt perfekt, trägt sich sehr angenehm!

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utilisé en dessous d'un chemise

A la recherche d'un t shirt blanc mérino, j'ai pris celui là, coupé les manches (que je peux utiliser comme manchon pour faire du vélo) et utilisé en dessous de chemises au travail. Permet de ne pas sentir le fauve si je fait un parcours à vélo pour aller au boulot. Confortable et correspond à ce que je cherchais. Pas très blanc en fait, plutôt crème.... donc la laine non teintée.

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Bon produit qui correspond…

Bon produit qui correspond à une activité "soft". Produit a ménager car un peu fragile ..

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Parfait en première couche…

Parfait en première couche pour la pratique du ski

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Bonjour Lucile,

Nous vous remercions pour votre achat et de votre commentaire laissé sur le produit. Nous vous en souhaitons ainsi un bon usage lors de vos futures sorties de ski !

Au plaisir de vous recevoir à nouveau dans notre magasin.



Une seconde peau confortable

Ergonomie au top et la limitation des odeurs est très efficace. La version sans colorant est juste magnifique en plus d’être meilleur pour l’impact environnemental

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Merci beaucoup Eric, pour le partage, très technique et enrichissant, de votre expérience produit écologique.

Nous sommes ravis de constater que vous êtes pleinement satisfait de votre produit, et ça nous fait très plaisir !

A très bientôt dans votre Mountainstore !

Laurence, Service Clients et Vendeuse Omni-Commerçante, passionnée de montagne.

Excellent rapport qualité prix

Excellent rapport qualité prix

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Produit agréable à porter…

Produit agréable à porter et chaud

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Chaud et sans odeur

Dès qu'une nouvelle couleur sort, j'achète...Je suis une inconditionnelle du merinos

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Additional Product Information


Main fabric: 86.0% Wool, 14.0% Polyamide ; Yoke: 98.0% Wool, 2.0% Polyamide

What are our commitments in favour of 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 have we enhanced the durability of our t-shirts made with 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 component reduces odours from perspiration. Laboratory tested according to ISO 17299-3This merino wool T-shirt can be worn for several days at a time, allowing you to carry less clothing on your trek and thus lighten your backpack!

Reduction of the freezing effect

When you make a physical effort and sweat heavily, the merino wool easily traps the insulating warm air and can absorb up to 35% of its weight in moisture without making you feel damp, which is appreciable in cool weather. In hot, dry weather, the evaporation of the water in the wool absorbs energy, which cools the body slightly at the same time. 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 t-shirt made with merino wool?

We recommend that you machine wash your MT500 MERINO GREIGE 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:

Product testing

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.



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
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    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

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    Minimal retail footprint

    lowers overhead and indirect costs


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