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Forclaz Trek 500 Merino Wool Backpacking Boxer Shorts Men's

Regular price: $34.99 Regular price:

Looking for some comfortable underwear that doesn't retain odors? These long-lasting reinforced merino wool boxers are ideal.

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Sale price: $34.99 Regular price:

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Model: 8542384

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Product Features

Forclaz Trek 500 Merino Wool Backpacking Boxer Shorts Men's | Our team of backpacking enthusiasts developed these merino boxers for backpacking comfortably over long periods!

Looking for some comfortable underwear that doesn't retain odors? These long-lasting reinforced merino wool boxers are ideal.

A photo of the Forclaz Trek 500 Merino Wool Backpacking Boxer Shorts Men's in use

Odor control

Merino wool naturally helps prevent unpleasant odors.


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

Abrasion resistant

Wool fiber surrounded by polyamide yarn for protection.

Moisture wicking

The high absorbency of wool helps keep the body dry

Freedom of movement

We added 4% spandex for superior elasticity and support.


Breathable material to maintain an ideal body temperature even in the summer!


These boxers weigh only about 2.8 oz in size L. Fabric 6.7 oz/m².

Product Customer Reviews

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714 Reviews
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Forclaz Trek 500 Merino Wool Backpacking Boxer Shorts Men's,black
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Great undies!

Great cool weather undies.

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not worth it

These are the ONLY pair of boxer briefs i own that roll. I dont get it? I even wasted money on a larger pair. $50 out the window. Horrible fitting underwear unless you have a concave waist so the top does not roll.

Hello Tony,

Thank you for your feedback. We are sorry that you are not satisfied with your boxer. 

Your feedback will be forwarded to our design team in order to improve this product.


Keeps the ... warm

Really great. Allows me to wear lightweight hiking trousers while still keeping my package at a comfortable temperature. A must for outdoor winter activities.

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Hi James,

Thanks for kind review!

Boxer shorts

Great value merino

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Good product but sizing all to pot

These are designed to be closer fitting than men's underwear should be. But additionally the sizing is a mess. I wear 32" waist trousers quite comfortably but the medium size in these pants is far too tight and uncomfortably close fitting. Size Large has a waist band measuring 14 1/2 " across and requires a forceful stretch to attain 16" so not even the large size quite attain the 32" medium size claimed. What's going on here?

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Merino boxers

Fab. Light, soft and very comfortable at a great price..

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Boxer shorts

For the price totally excellent and just as good as the top brands

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Great quality

Really comfy, great price

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Poor Quality

I bought a black pair in January 2022. I wear them three or four times a week when I go on walks (less than 5 km). The gusset have completed worn away and there are large holes!! I had to bin them. The wool boxer shorts are not fit for purpose. Do not buy them. I've lost my receipt so I assume I cannot ask for a refund (as it's still within the 2 year warranty period).

Value for money

Very pleased with this purchase especially after a 6 hour hike. Merino pants offered plenty comfort & dryness on a hot day.

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The best boxer shorts i've ever worn!

These boxers are superb! I work as a sports coach and outdoors instructor, therefore i'm very active. These are warn when it's cold, cool when it's warm and seriously comfy!! No chaffing, even when wet and they don't get stinky!! On a recent work trip to Lanzarote I wore them all day in the heat and they were great! I ran, walked and even swam in them and they held their shape and dried really quickly. I can't recommend them enough!

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Hi Morgan, we really appreciate the 5-star review. At Decathlon we try our very best to give our customers the best value for money with top quality products! It's great to hear about the great use of the shorts you've had!

Thank you for the review and we can't wait to welcome you back into store soon for all of your sporting needs :)

Great products


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Nice pair of boxers

Extremely comfortable, sizing good.

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Cannot recommend

Really wanted to like them, but wool is not very comfortable (a bit itchy), very very thin and the waistband is really tight - seems to be getting tighter with washes! After 3 weeks, they are now in the back of the drawer, to be used in the event of emergency.

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Instant heat

Very warm and comfortable

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Size Guide

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Additional Product Information


Main fabric: 86.0% Wool, 4.0% Elastane, 10.0% Polyamide

Sizing and fit

These boxers have a fitted cut for enhanced moisture transfer to the outside of the fabric.


There is 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.

Advice before use

To make the component feel softer, don't hesitate to wash your boxers before 1st use.

How to wash your merino wool boxers?

Machine wash your merino wool boxers at 86°F on a normal cycle, preferably with a liquid detergent.Dry flat and NEVER tumble dry unless you want it to shrink by 1 or 2 sizes!For more information:

Product testing

These boxers have been tested and validated in the field in real-life conditions. They were worn for 5 weeks in spring 2019 by several people who went backpacking in the Canary Islands for 2 weeks, followed by 3 weeks on the GR10 route in the Pyrenees.



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

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    minimize manufacturing costs

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    Minimal retail footprint

    lowers overhead and indirect costs


Size Guide Visual