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Trek 900, Backpacking Pants, Men's

Sale price: $89.99 Regular price:

Their great freedom of movement makes them perfect for intensive backpacking. And the fabric’s tight weave gives you good protection against the wind.

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Size Guide

This product runs small

Sale price: $89.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8343230

Product Features

Trek 900, Backpacking Pants, Men's | Our team of backpacking enthusiasts designed these pants so you can hike all year round with protection

Their great freedom of movement makes them perfect for intensive backpacking. And the fabric’s tight weave gives you good protection against the wind.

A photo of the Trek 900, Backpacking Pants, Men's in use


Use of a stronger fabric on the knees and seat.

Freedom of movement

2-way stretch fabric, preformed knees, elasticated waistband.

Quick dry

Synthetic fabric encourages moisture wicking and quick drying.

Water repellent

Treated surface to prevent water from seeping into the fabric.


Tight weave for active protection against the wind.


These pants weigh about 1 lb in size S.

Easy to maintain

Machine-washable synthetic fabric, no need to iron.

Product Lifestyle Image Gallery

Image Gallery

Trek 900, Backpacking Pants, Men's,carbon gray 

Trek 900, Backpacking Pants, Men's,carbon gray 

Trek 900, Backpacking Pants, Men's,carbon gray 

Trek 900, Backpacking Pants, Men's,carbon gray 

Trek 900, Backpacking Pants, Men's,carbon gray

Product Customer Reviews

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Trek 900, Backpacking Pants, Men's,carbon gray
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need a better belt and buckle system

generally comfortable pants, however, the belt really need some work. it gets loose easily and the plastic buckle broke after 1 month's use.


Selected for mountaineering. They are great. Sizing is quite snug so it’s important to go at least one size up for a regular fit.

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Outdoor pants

Great for mountain biking

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Hi Krikorian,

Thank you for the 5-star review on these pants! We are happy to hear that you were able to find a product that works well for many different uses!

Sizing ?????

I ordered this item online in store. It wasn't easy to figure out the correct size for gift giving. The online was sized one way & the inshore another. WHAT? Then theres the issue that everything seems small... I wear a small in most items but not at DETHALON. I wear a large inmost items then have to have everything hemmed at least 6" Frustrating to say the least..

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Hi Marcia! Thank you for letting us know about your experience. As Decathlon is a global brand, we list the sizing universally in the most common standards. On our tags you'll find US, GB, AUS (and more)! If you hop on the website to order, you'll only have the option to order the sizing we use most commonly in that particular country. We've added sizing conversion charts to the end of each aisle (in store) to hopefully make this system a little less confusing! Please don't hesitate to ask a staff for help in discerning the clothing sizes on your next visit, we're always happy to assist!

Great hiking pants - a little slim though

These are great trousers for a fall or summer hike. Though they do fir on the small side so beware.

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Walking trousers

Love the trousers great for hillwalking

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100% superb pair of Trousers !

2nd pair ordered (put on wight so went up a size) Well made, extremely comfortable, excellent pair of walking and hiking trousers I fully reccoment this product

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Great trousers

So good I am after another pair. Had to go up one size as I have big thighs and they were a bit to tight. This meant they were to big in the waist but as they come with a belt it’s not a problem. So stretchy they are great for freedom of movement.

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Great, but wish they came in different lengths

These are fantastic outdoor trousers for hill walking, scrambling and climbing. Light tough and easy to move in they compare well with top brands like Rab or Mammut. My only beef with them is that they come in only 1 leg length, which for shorties like me is a bit of an issue. Luckily, they have a draw cord at the ankle.

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Very good item.

Great walking, trekking and general outdoor trousers.

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Great hiking trousers

Good fit, comfortable and great look!

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Nice pants

Great trousers at half the price of the competition, Own three pairs only critique would be lack of colours - A blue pair would be nice👍🏻

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Excellent trousers!

Very good item!

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Great trousers not just for walking but for a working man who needs to look smart yet practical. Lots of pockets and really stylish. Wash well too. A little expensive but then you get what you pay for! And these really are good.

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Fantastic trousers, comfortable and stretchy

These trousers are extremely comfortable, perfect for scrambling as they're so comfortable to wear. Not really waterproof, anyone walking in heavy rain would struggle, but these pants are so practical, great pockets and stretch on them, not restrictive at all despite them being quite a tight fit, they feel like pyjamas. Will be buying my 3rd pair soon.

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Size Guide

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Additional Product Information


Main fabric

  • 88% Polyamide
  • 12% Spandex


  • 50% Polyamide
  • 43% Polyester cationic
  • 7% Spandex


  • 100% Polyester cationic

Sizing info

These pants have a snug, close-fitting cut. The use of fabric with 2-way stretch gives perfect ease of movement. If you prefer looser-fitting pants, choose one size up from your usual size. Inside leg of 33.1 in size S


2 zipped hand pockets 2 zipped thigh pockets 1 zipped back pocket Elastic tightening system and a hook on each ankle to adjust the pants perfectly and attach it to the shoe Ankle zipper

What is the water-repellent property of the component?

Please note, this product is not waterproof. The water-repellent property prevents the pants from getting wet too fast but will not keep you dry under steady rain. This can be achieved by wearing overpants. Water-repellent properties can be reactivated by tumble drying the pants for 10 minutes on low temperature. You can also use the Forclaz re-waterproofing spray (ref 8554908)

In case of rain...

These pants are not waterproof. In the event of rain, we recommend you protect yourself with waterproof and breathable overpants. Check out the Trek 500 overpants (ref. 8493660).

Determining the environmental impact of our products

The environmental impact of the product is calculated based on its entire lifecycle and using different indicators. A general score from A to E is provided to help you easily identify the most eco-friendly products by comparing products of the same type (T-shirts, pants, backpacks, etc.). Decathlon is committed to displaying this environmental information. For more info:



Care instructions

Wash at 86°F.

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