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Women's Mountain Biking 3/4 Mid-Length Bottoms ST 100

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Sale price: $16.99 Regular price:

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Model: 8300401

Product Features

A photo of the Women's Mountain Biking 3/4 Mid-Length Bottoms ST 100 in use

Women's Mountain Biking 3/4 Mid-Length Bottoms ST 100 is designed for your first MTB touring experience. Work out and have fun in the outdoors.

With its ergonomic foam pad designed for women, the ST 100 Rockrider mountain biking cropped bottoms absorb vibrations and reduce chafing for improved comfort. The knees and thighs are protected.

Seat comfort

The ST100 pad is made from preformed foam specially designed for women's bodies.

Freedom of movement

Forget you're wearing it: snug cut, stretch fabric, and comfortable waistband


Shaping material. Comfortable elastic at the waistband and underneath the knee.

Reduction of irritation

Flat seams in contact with the skin to reduce risk of chaffing.

Product Customer Reviews

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278 Reviews
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Women's Mountain Biking 3/4 Mid-Length Bottoms ST 100,black
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Fits well

I am not a high waist person and as an Asian, my height also not that high. However, with this item it perfectly fits on me. I just noticed that the bottom end lining of it are somewhat crumpled already maybe because it had been frequently used during try-on. This part could be improved further moving forward. Overall i’m happy with the product

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Hi Cookielet!

Thank you for taking the time to leave a feedback on the Women's Mountain biking 3/4 Mid-length Bottoms ST 100 - Black. Your feedback is valuable to us and will help us to improve our products over time. We are glad that you enjoy the product(:

In Decathlon we believe in making sports accessible to all and also ensuring that quality expectations are still met despite the affordable prices that we offer. Your feedback will be very well taken into consideration and we will ensure that we will review the prices again in the coming products in future.

Please feel free to leave more reviews on Decathlon products! We hope to see you soon in stores! Thank you.

Suzy Panday

Sports Advisor

Decathlon Jookoon


Very good product

Don't bother...

Bought these to cover training when I don't want to show my legs in the gym.. my other leggings are great but too warm. They've done an hour of training before the inner thigh has worn through. More embarrassingly during a training session when I still had a run to do after. Expected so much more of these especially when all other clothing has been excellent.

I'm sorry to read that the item was no longer fit for purpose after only an hour in the gym. This is not normal at all.
It may be that the saddle on exercise bikes are wider than on a normal bike but it should not cause so much wear so soon.
Please return them to us a for a refund or an exchange.
Peter, Cycling Manager, DECATHLON
Material wasn’t as good as my previous pair

Great product for a great price when I bought my first pair last spring! And that pair lasted about 18 months of weekly spin classes. Then they finally wore through (where they catch on our type of spin bike. So I rushed to Decalthlon to replace them only for them to be a disappointment. The amount of elastane in the fabric is less so the are not tight enough on the tummy and fall down. They also succumbed to the friction within 3 wears!!! Very disappointing! Please please please change back to better fabric.

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Perfect Fit and Comfortable

I used this mostly on my rides and it feels comfortable it fits just right. I don't use underwear but I have to wear shorts over it. Overall i like this product so much. The only downside is that it is only recommended for short rides like 30 km to 40 km rides 3-5hrs. I tried wearing this for 100 km ride and most likely to happen that groin area will hurt. It wicks away perspiration and easy to wash.

Excellent buy

Excellent buy good value for money

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Very satisfied of my purchased

Good quality, perfect fitting. Very happy

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Best pair of cycling pants I have had really comfortable

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OK, but not great

I cycle around 100 miles a week and LOVE the decathlon cold weather trousers. I bought these as it’s getting a bit warm and could do with something a bit cooler. They are very stretchy, which is not necessarily a bad thing, but they do not seem to give legs as much support as the cold weather tights. To be honest, these have been consigned to the 'wear in dire emergency' pile of clothes and I’ll be buying a better pair with a bit more compression to support my knees.

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Great value

Wife really impressed and offered additional comfort on the bike!

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Comfort and stylish

The medium size fits great - i'm a size 12 - and i've used a number of times with nothing but good to say. The cycling shorts wash well too. The padding is so comfortable that I have enjoyed cycling further than expected!

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OK with big pants!

Super comfy, nice soft fabric however unfortunately, after about 5 miles the stitching that holds the padding in transforms into an accessory from a Saw movie and cuts into your bum like razor wire. OK for very short rides and fine with giant pants underneath but cycling bottoms should be designed to be worn commando.


Great value for money. These are super comfy and served me well during a 60 mile cycle at the weekend.

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Good padding for shorter rides

No negatives but these wouldn't be good for a full day of riding, I use these for commuting, 10 miles. Fit is comfortable and the end of the trousers have that soft rubbery stuff so they don't move around and sit nicely on the leg. Great for spring/summer cycling when it's still a bit nippy!

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Good lady fit

Good lady fit, my wife tells me. unlike the ones id been lending her (man ones).As most Decthlon cycling gear, its great value for money. you might want a more technical cycle short if you were doing big milage but for the odd trail and 20mile or so ride there spot on.

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Size Guide

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Additional Product Information


Main fabric

  • 87% Polyester cationic
  • 13% Spandex


  • 51% Polyester cationic
  • 49% Polyurethane

Let's talk about the women's mountain biking cropped bottoms...

These 3/4 cycling bottoms, which come to just below the knee, are made from a stretchy fabric that perfectly follows your movements and provides great support. All while staying lightweight and breathable. The ST 100's pad is discreet.

Our tips for the mid-season

In spring and autumn, you may wish to wear these mountain biking cropped bottoms underneath shorts to protect your thighs from both the weather and vegetation.

How to improve your comfort in the saddle

For improved comfort, we recommend: 1/ Investing in cropped bottoms or shorts with a built-in pad to avoid irritation and chafing. 2/ Take care to choose a saddle suitable for women's bodies. The ST 100 and ST 500 saddles are available on women's Rockrider mountain bikes. But also as spare parts. 3/ Add a gel seat cover to your saddle. They are compatible with the Women's Rockrider saddles and make you more comfortable during your MTB tours thanks to their spongy texture.



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

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    Minimal retail footprint

    lowers overhead and indirect costs


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