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Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's

Sale price: $16.99 Regular price:

The ST 100 MTB jersey is made from material that holds up to riding through brush, has a relaxed fit, and 2 easy-access pockets, including 1 with a zipper for your phone.

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Size Guide

This product runs small

Sale price: $16.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8530229

Product Features

A photo of the Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's in use

Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's | This MTB jersey is resistant to riding through brush, and is designed for getting started with mountain biking.

The ST 100 MTB jersey is made from material that holds up to riding through brush, has a relaxed fit, and 2 easy-access pockets, including 1 with a zipper for your phone.

Resistant to wild vegetation

It reduces snagging thanks to durable fabric designed for mountain biking.

Freedom of movement

It has a relaxed fit that allows you to sit comfortably on the bike.


This jersey is made from material that provides good ventilation.


2 pockets, 1 with a zip, let you carry keys, bank card, smartphone, tissues etc.

Product Lifestyle Image Gallery

Image Gallery

Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's,slate blue 

Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's,slate blue 

Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's,slate blue 

Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's,slate blue

Product Customer Reviews

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Rockrider ST100, Short Sleeved Mountain Biking Jersey, Men's,slate blue
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returned it

The length is insanely long. I got the XL based on the size guide. I am thinking it would fit if you are 6'4" or so. other then length the cut is OK, quality is OK. I returned it because length makes it unwearable.


Decathlon products normally run small, so instead of buying a small size jersey i bought a medium one. I even checked their size guide. This is incredibly small even when i went one size higher. it's hard to move with the sleeves manufactured too tight. I wish I could return it but decathlon's return policy is like pulling teeth. Other than that, the material looks good and feels like it would last a long time. I just wish their advertised sizes are a little bit closer to reality.

Hello, Kel!

Thanks for your review! We're sorry to hear about the sizing issues. Please reach out to our customer service team to get this all figured out.


Comfortable shirt, nice cut, lightweight, dries fast pockets are handy.

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Great Value

As a new entrant to mountain biking Decathlon products represent great value.

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Good quality

It definitely worths for its price

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Comfortable shirt

Very comfy cycling shirt.

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Good size and handy pocket

The material was not what I was expecting but it tis comfortable and easy to wear. The zip pocket holds my phone nicely. The size is perfect

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excellent price point

MTB jersey, comfortable to wear

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Nice jersey at an amazing price - recommended.

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Perfect for those epic Emtb rides

Excellent for warm weather rides. The extended rear keeps the lower back covered whilst sitting on the saddle and the zipped pocket is ideal for keeping keys safe whilst on the trails. Sweat evaporates effectively ensuring comfort when the going get hot.

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Hello Geoff,

Thank you for your excellent feedback.

Looking forward to seeing you again in our business.

Have a good day !


Cycling top

Excellent and comfortable and light weight

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A casual looking top for cycling.. .looks good, feels good

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Great t-shirt, difficult to take off though! No stretch at all

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Perfect top

A good addition to your mountain biking attire. Go for the next size as I'm normally a medium and large fits perfect

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Bright short-sleeved cycle jersey with zip pocket

Bought this for the hot weather this summer for road cycling as I couldn't find a road cycling jersey I liked. The fabric is sweat-absorbing but a little rough on the skin. I also found the pockets inconvenient compared to the 3 pockets usually found on the back of a road jersey. The right-hand zip pocket is however secure for a phone or money. The left-hand pocket is just a small tuck-in pouch for an energy bar, etc. It's useful as a teeshirt with pockets though!

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Size Guide

Size Guide Visual

Additional Product Information


Main fabric

  • 100% Polyester cationic

  • 9% Spandex
  • 91% Polyester cationic

Why pockets?

For carefree riding, plan ahead and keep the essentials to hand: - On your left, there's a pocket with an elasticated flap for carrying all of your personal belongings (bank card, cash, keys, etc.). - On your right, a secure pocket with an easy-to-open zipper (even with gloves on!) so you can access things you need while riding with one hand, such as your phone, tissues, etc.

The cut

This jersey is both sporty and casual with a V-neck and heathered effect. Most of all, it's a real mountain biking jersey! The cut and seams were designed to prevent friction and to keep you as comfortable as possible while in a riding position. For example, the jersey is long enough in the back to keep your entire back covered, even when leaning over your handlebar.

Resistant to brush?

To allow you to ride along the trails without worrying about branches and leaves, our design team selected a fabric with a tight knit. The result? A real mountain biking jersey that withstands snags when riding through brush, as well as friction from the straps on your hydration backpack. Plus, the material is designed to offer good ventilation!

Tips from our team

When learning to mountain bike, remember to wear a helmet, not just for falls, but also to protect yourself from low branches! For comfort, wear a pair of shorts with a pad to prevent chaffing. A water bottle or hydration backpack will keep you hydrated. And finally, puncture repair spray so you can finish your ride without having to fiddle with repair tools.



Product testing

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.

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