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Forclaz Trek 500 Zip Long Sleeved Merino Wool Hiking T-Shirt

Sale price: $74.99 Regular price:

Looking for a comfortable anti-odor base layer? This long-lasting reinforced Merino wool T-shirt is ideal. With easy air cooling thanks to its zipped collar.

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Sale price: $74.99 Regular price:

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San Francisco, 735 Market St. Options

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Model: 8550198

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Product Features

Forclaz Trek 500 Zip Long Sleeved Merino Wool Hiking T-Shirt | This merino wool T-shirt keeps the body at a pleasant temperature in all seasons. Ideal for backpacking over several days!

Looking for a comfortable anti-odor base layer? This long-lasting reinforced Merino wool T-shirt is ideal. With easy air cooling thanks to its zipped collar.

A photo of the Forclaz Trek 500 Zip Long Sleeved Merino Wool Hiking T-Shirt in use

Odor control

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


Merino wool T-shirt to provide extra warmth as a first layer

Abrasion resistant

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

The natural stretch of wool offers unrestricted movement


The T-shirt weighs just 8.6 oz in size M. Fabric 6.7 oz/sqm


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

Product Customer Reviews

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639 Reviews
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Forclaz  Trek 500 Zip Long Sleeved Merino Wool Hiking T-Shirt,black
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Nice fit

I am 5 ' 10" and 195lb. This merino long sleeve fits me perfect in size XL. It is close to your skin so can be used as base layer or mid layer. I haven't actually used it much yet so not sure about durability or temperature management but the garment appears to be good quality with nice stitching around, with soft feel.

Nice quality garment yet bad customer service

Given the competition this garment seemed like a real value at $50. The workmanship and fabric quality was excellent. I had previously bought the orange merino hiking shirt and while I wear a US XL in Decathlon's sizing the 2XL fi . Which, as you might imagine, is the size I ordered. So why they sent me a men's Small I'll chalk up to bad luck. Maybe you'll have better.

Another great product from Decathlon!

Great quality!

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I loved the way this top looked and the quality of it. It worked perfectly to keep me warm during my ski holiday, and I look forward to use it when walking too.

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Great top

Bought as a base/mid layer to wear under a big woollen jumper, amongst other tops, great fit, clean design no problems so far. Although I've worn it several times I've not had the need to wash it yet, so that says something about the natural properties of Merino wool.

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Great value

A good Merino top at a great price

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Outstanding value

As someone who has used Icebreaker and Arcteryx base layers before I can say that, for the price I'm blown away at the quality of this product. There not quite to the same level as IB or Arcteryx but for the money, I would say they are 90% there and that's saying a lot.

Great top

Great fit, quality fabric and lovely style. Definitely recommend.

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Leroy's review

I wore the Trek 500 merino base layer on a 16 mile day hike, it performed very well, it wicked moisture away and was comfortable to wear, even though I was carrying a 40 litre back pack and it was a hot day.

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Superb all rounder

A lightweight base layer that ticks all the boxes for outdoor activities

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High quality merino wool base layer

Great base layer and high quality for the price. Similar to IceBreaker but half the price.

Excellent Trekking Base Layer

Very happy with this T-Shirt. When using the sizing tool ensure you select tight for the right fit, when the merino sits right on your skin it works perfectly. The shirt it made of a great blend of merino wool and and a Polyamide, I love the design as the yoke of the shirt is actually made with more merino where it gets the sweatiest. Great zip to vent during exercise and a durable weave all around with tough seams. It is very comfortable to wear, enough length to tuck in, it insulates well and breathes superbly, anti microbial properties mean you can wear it longer than you should be comfortable with as the sweat evaporates whilst still insulating. Already bought a second one.

Great value

inexpensive merino wool base layer - Great!

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Men's Mountain Trekking Merino Long-Sleeved T-Shir

Very warm on the bicycle, good cuff for hiding the zip

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No comment cause hvnt tried

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Hi Wai Kiu,

Thank you for supporting Decathlon Hong Kong and your feedback on your experience with our product!

We sincerely appreciate your insight! It's also our pleasure to ensure you have the best experience with our products! 

We can't wait to offer you more and better products in order to delight your sport experiences! 

If you have any more questions, comments, please feel welcome to reach back out as we would be more than happy to share and assist. Hope to see you around soon!

Stay healthy!


Decathlon Hong Kong Hiking & Trekking Team

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Additional Product Information


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

How did we improve the durability of our merino wool t-shirts?

We use a BETA-SPUN yarn structure, i.e. the merino wool fibers are coated with a fine sheath of polyamide filaments to protect them from rubbing and cuts, without affecting the properties of the wool.

Odor control

Wool from Merino sheep naturally controls the spread of bacteria that cause bad smells. This Merino wool T-shirt can therefore be wornseveral days in a row and means you can take less clothes when backpacking making for a lighter backpack!

Reducing the "freezing effect"

After exercise and heavy sweating, Merino wool prevents evaporation helping to maintain body temperature by absorbing the majority of the body's moisture. This therefore reduces any unpleasant chilling effect.Conversely, a synthetic material lets the body temperature go back down again quicker.

Advice before use

To make the component feel softer, don't hesitate to wash your T-shirt before first use.

How to wash your merino wool t-shirt

We recommend that you machine wash your Merino wool T-shirt 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!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 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 backpacking 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
  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


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