Product Colors and Sizes

  • Black Friday product
  • New Deal product
  • Cyber Monday product
  • Clearance product
  • Deal product
  • Best Seller product
  • Ecodesign product
  • New product
  • Staff Pick product
  • In The News product
  • Innovation product
  • product

Men's Mountain Trekking Merino Wool Boxer Shorts MT500

Sale price: $34.99 Regular price:

Looking for a comfortable and durable base layer? Here's the solution with these boxers containing reinforced merino wool for superior durability.

Color: Select a color
Size: Select a size
Size Guide
Sale price: $34.99 Regular price:

Free shipping over $49

Free returns

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

About this item:

  • Durable and Breathable Merino Wool
  • Moisture wicking: Significant absorption capacity
  • Naturally flexible materials for comfort and freedom of movement
  • Weight: 2.8 oz in Size L
Model: 8542384

Product Videos

Product Features

Men's Mountain Trekking Merino Wool Boxer Shorts MT500 | Our team of mountain trekking enthusiasts developed these boxers, which contain merino wool, for trekking comfortably over long periods.

Looking for a comfortable and durable base layer? Here's the solution with these boxers containing reinforced merino wool for superior durability.

A photo of the Men's Mountain Trekking Merino Wool Boxer Shorts MT500 in use


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

Moisture wicking

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

Odor control

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

Abrasion resistant

Wool fibre surrounded by polyamide yarn for protection

Freedom of movement

We have added 4% elastane for more stretch and support


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


These boxers weigh only about 80g in size L. 190 g/sqm fabric

Questions & Answers

Product Customer Reviews

Skip to reviews
734 Reviews
Write a Review 

Men's Mountain Trekking Merino Wool Boxer Shorts MT500,black
Filtered by reviews Loading reviews…
Great undies!

Great cool weather undies.

icon-circle-checkmark verified purchase
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.

icon-circle-checkmark verified purchase

Hi James,

Thanks for kind review!

Great value.

I bought these for hiking and found them to be extremely comfortable, a perfect fit and great at keeping moisture away from the skin. Ordering was extremely easy as what collection from my local store. Thoroughly recommend.

icon-circle-checkmark verified purchase
Boxer shorts

Great value merino

icon-circle-checkmark verified purchase
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?

icon-circle-checkmark verified purchase
Merino boxers

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

icon-circle-checkmark verified purchase
Boxer shorts

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

icon-circle-checkmark verified purchase
Great quality

Really comfy, great price

icon-circle-checkmark verified purchase
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.

icon-circle-checkmark verified purchase
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!

icon-circle-checkmark verified purchase

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


icon-circle-checkmark verified purchase
Nice pair of boxers

Extremely comfortable, sizing good.

icon-circle-checkmark verified purchase
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.

icon-circle-checkmark verified purchase
Skip to reviews

Size Guide

Size Guide Visual

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.

How have we enhanced the durability of our boxers made with merino wool?

We have used a BETA-SPUN yarn structure in which the polyamide threads coat the Merino wool fibres and protect them from rubbing and breaking without affecting their properties.

Tip before use

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

How to wash your merino wool boxers

We recommend that you machine wash your Trek 500 Merino boxers at 30°C 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

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 trekking in the Canary Islands for 2 weeks, followed by 3 weeks on the GR10 route in the Pyrenees.



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

Please Sign In to Post Your Question

In order to notify you about the answer it is required to Sign In.

Sign In