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Mountain Biking Short-Sleeved Jersey ST 100

Sale price: $12.99 Regular price:

Hit the trails in this mountain biking jersey. The shape was designed for comfort! It has 2 secure pockets, including 1 easy-access smartphone pocket.

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This product runs small

Sale price: $12.99 Regular price:

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8517601

Product Features

A photo of the Mountain Biking Short-Sleeved Jersey ST 100 in use

Mountain Biking Short-Sleeved Jersey ST 100 | Our team designed this durable mountain biking jersey to be able to carry everything you need on your first rides, up to 90 minutes.

Hit the trails in this mountain biking jersey. The shape was designed for comfort! It has 2 secure pockets, including 1 easy-access smartphone pocket.

Freedom of movement

The loose fit and seams were designed based on your riding position.

Resistant to wild vegetation

The special abrasion-resistant knit won't run or snag.


This jersey is made from breathable fabric for good ventilation when riding.


Carry keys, a debit card, smartphone, tissues in the 2 pockets, 1 with a zipper.

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Mountain Biking Short-Sleeved Jersey ST 100,black 

Mountain Biking Short-Sleeved Jersey ST 100,black

Product Customer Reviews

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Mountain Biking Short-Sleeved Jersey ST 100,black
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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

Clever pockets

To ride safely, keep everything tucked away but close to hand: - On your left, a pocket with an elasticated flap for personal items: keys, money, a debit card and more. No need to dig around the bottom of your bag before and after your ride! - On the right, a secure zip pocket that's easy to access (even with gloves) to reach what you need with just 1 hand: smartphone, tissues, etc.

A design and cut for comfort when riding

This jersey is both sporty and casual with a V-neck and mottled-effect fabric. But most of all it's a real mountain biking jersey! The cut and seams were designed to prevent friction and for comfort on the bike . For example, the long length keeps your entire back covered, even when leaning over your handlebars.

A durable fabric for worry-free rides

To hit the trails without worrying about branches and leaves, our ROCKRIDER clothing design team chose a special fabric that won't run if caught on vegetation. The result? A real mountain biking jersey that withstands getting snagged by vegetation and friction from your hydration backpack. The mesh-inspired knit is also ventilated for better moisture management.

A jersey with a story...

What do beginner mountain bikers wear? After observing their wardrobes, we're pleased to offer you this jersey designed especially for mountain biking. Our team of 5 designers spent 18 months working on identifying needs, technologies, designs, prototypes and lab tests and gathering input from a panel of 12 mountain bikers. After lots of test and tweaks, we created a comfortable and clever product. Our testers loved it - Now it's your turn!

Tips from our team

To make your first mountain bike rides enjoyable, remember a few essentials. What are they? Our product manager Sylvain explains: "To learn to mountain bike, remember to wear a helmet: not just for falls, but also to protect yourself from low branches! For comfort, a pair of shorts with a built-in pad will prevent irritation. A water bottle or hydration backpack will keep you hydrated. And finally, a puncture repair spray to finish your ride without worry."



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