Mountain Biking Shorts - Navy


This durable mountain-biking jersey is designed for rides lasting up to 90 minutes in warm weather. It has two pockets, including one zipped pocket.

In these comfortable, snag-resistant cycling shorts you can ride through the undergrowth with no worries this summer. Not only do they absorb vibrations, they prevent rubbing and chafing too.

Color: Navy blue / DARK BLUE / Fluo lime yellow
Size: size guide


Product benefits

Abrasion resistance

Experience a brush with nature! The fabric withstands rubbing and snagging.

Sitting comfort

Ride comfortably for up to 4 hours with the ergonomic foam pad.

Freedom of movement

Special cut and elasticated fabric for riding comfortably.


With undershorts that effectively wick away perspiration.


Take everything you need in the 5 handy pockets.


Feel supported with the stretchy undershorts

Technical information

Keep your gloves to hand!

When mountain biking, gloves are often the last thing you put on and the first thing you take off. These shorts have a buckle on the waist so you can keep hold of your gloves without having to rummage around in your pockets. You can snap your ST 100 and ST 500 gloves on them using the press stud to keep them handy at all times.

A bit more about these shorts...

To help you get the most out of your rides, these shorts are made from 2 fabrics: a stretch fabric to follow your every move and a durable fabric to prevent snags and tears. They are also lightweight and breathable for better moisture management.
And to let you move around freely, the waist is elasticated so that it fits you nicely.
The shape is designed to avoid the crotch getting caught on the front and back of the saddle.

All you need, in your pocket!

To have everything you need when you head out for a ride, these shorts have clever pockets:
- At the back there's a zip-up pocket for things like keys, credit cards, etc.
- There's a zip-up waterproof pocket on the back of the thigh that's easy to access (even with one hand) and positioned to protect your phone from falls.
- There are three places along your thigh for storing cereal bars: simply push down to get them out.

Shorts, undershorts, pad? Here are our tips!

Your ST 500 shorts come with removable undershorts so you can change undershorts without changing everything. And of course, your undershorts act as underwear!
When you buy them, the shorts and undershorts are attached. But before you set off on a ride, remember to detach them!
Why? Because each has their own role to play:
- The undershorts stay tight against your skin for comfort and support.
- The shorts let you move around as you ride.

Product tests

Our team of product designers based at the B'Twin Village in Lille is continuously working to make cycling more comfortable for our users.
Our obsession is to create products that meet the specific cycling needs of our users and eliminate things that get in the way of their rides.

A rating to compare products' environmental impact.

A product's environmental impact is calculated for its entire life cycle using various indicators. An overall rating (ABCDE) is given, allowing you to easily identify products with the best environmental performance by comparing similar products to each other (T-shirts, trousers, backpacks etc.).

Decathlon openly displays the environmental ratings of its products.
To find out more:


2 years

Product concept & technology

Product Composition

Main fabric 88% Polyester, 12% Elasthane Yoke 100% Polyester Inner fabric 100% Polyester Padding - Inner fabric 60% Polyurethane, 23% Polyamide, 11% Polyester, 6% Elasthane Padding - Outer fabric 80% Polyamide, 20% Elasthane Lining 71.11% Polyester, 28.89% Polyurethane


Store in a clean, dry place.


Our engineers always have real riders test all our products in real conditions. These tests round out our lab tests and let us validate all our products before they hit store shelves.

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean

Customer reviews


Environmental Impact

The carbon footprint of this product is:
14.59 kg CO2e
1 kg of CO2e represents 5km in a petrol car (according to the Base Carbone© of ADEME)
What's the carbon footprint ? We evaluate the environmental impact of all our products. At all stages of their life cycle: from the extraction of the raw material, passing through transport to the plant which transforms them, the transformation, the manufacture, the transport of the finished product, until its use and end of life. Find out more
The environmental note of this product is: E
What is the environmental note? Overall environmental score for this product in comparison to others in the same category. It is calculated based on its impact on the environment (air and water emissions, greenhouse gas emissions, depletion of natural resources) at each stage of its life cycle, according to a system managed by ADEME. Find out more