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Rockrider Men's Mountain Bike Undershorts EXPL 500 - Black

Sale price: $5.00 Regular price: $34.99

With its thick pad and breathable fabric, the ergonomic foam pad on these men's undershorts absorbs vibrations and prevents chafing and irritation.

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Sale price: $5.00 Regular price: $34.99

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Final Sale: No returns or exchanges

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San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8580800

Product Features

Rockrider Men's Mountain Bike Undershorts EXPL 500 - Black | These mountain biking undershorts were designed for your mountain biking rides lasting 3 hours on average

With its thick pad and breathable fabric, the ergonomic foam pad on these men's undershorts absorbs vibrations and prevents chafing and irritation.

A photo of the Rockrider Men's Mountain Bike Undershorts EXPL 500 - Black in use
A photo of the Rockrider Men's Mountain Bike Undershorts EXPL 500 - Black in use

Seat comfort

Ride comfortably for up to 3 hours with the ergonomic foam pad (13 mm).

Moisture wicking

Actively wicks away perspiration to the outer surface for quick drying


Fitted cut without compression, very elasticated waistband


Elastane in the fabric to guarantee ease of movement.


You just need one: these undershorts are compatible with our men's MTB shorts


170 g in size L.

Questions & Answers

Product Customer Reviews

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Paired with mountain bike outer pants (without inner padding), the riding effect is very good

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It's good product value for money I've been using for a year now you can easily were it for 4/5hrs had no issues with it just a slight problem is there is small elastic band on thigh is to tight may be cz I bought it online so couldn't try it so if you are buying it for the 1st time i suggest you to visit the store and try it yourself before making the purchase

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Very nice, very good…

Very nice, very good product

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Its not suitable for my usage

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I used it for about 100km, it is a successful product and I recommend it. The mesh section on the sides for air permeability also functions very well and is a very nice detail as it is not noticeable. Maybe it would have been better if it was just a small pocket. It said double layer pads, if the other products in the store are single layer, I don't think they will be of much use in terms of comfort, but this is quite enough.

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Uncomfortable due to the inelastic lycra

Like the black Rockrider Racer MTB bib shorts, they have uncomfortable lycra, not easy to adjust and uncomfortable. The chamois is the same and has not improved compared to previous ones. I'm going to return it along with the bib shorts. I'm sorry, but I can't rate this product as positive.

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Very comfort shorts for long ride.

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Very satisfied

Very comfortable

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Very good product value…

Very good product value for money

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cycling trousers

good product

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Comfortable but has a problem

They are quite comfortable during use, but putting them on and adjusting them correctly is not exactly easy and because of this, a few of the seams that hold the chamois have already come loose in less than 2 months with an average use of once a week. It's a shame because the rest of the product is quite good.

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It is also comfortable for a whole day tour.

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Good but really small size

Comfortable under shorts. Good padding. But not very stretchy and really small size. Usually I take size M and to have a slightly stretchy garment I had to take a size XL! You absolutely have to try it before you buy it!

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Additional Product Information


Main fabric: 87.0% Polyester, 13.0% Elastane ; Foam: 100.0% Polyurethane ; Yoke: 86.0% Polyester, 14.0% Elastane ; Lining: 100.0% Polyethylene

In a nutshell

Pad thickness: 13 mmPad density: 100 kg/m3Pad firmness: 25 KPa

Undershorts support.

Bibless undershorts can be much more practical. But do you get enough support?To guarantee the support you need, even without straps, we have made a pair of undershorts that hugs your body just like boxers. The elasticated waistband adapts to fit you and stays in place with no adjustment needed.

A second skin with comfort to boot.

The pad has been designed for more regular users looking to progress in MTB. The support foam is also soft but more dense. It protects pressure zones for up to 3 hours. The foam is soft and the stretchy outer layer hugs the cyclist's body so the pad can follow their movements. Foam thickness: 13 mmFoam density: 100 KG/m3Foam firmness: 25 KPa

Shorts, undershorts.

Undershorts are to MTB what kilts are to Scotland: you wear them against your skin!To avoid chafing, we therefore recommend changing them and washing them as if they were underwear.And when you're riding, your shorts and undershorts should never be attached.Why? Because each has their own role to play:- The undershorts stay in place for comfort and support.- The shorts move with you for better freedom as you cycle along.

Care instructions

You can find detailed info on looking after your mountain bike clothing on our website

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 hindrances to a good cycling experience.

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.

Storage instructions

Store in a clean and dry place.




Size Guide Visual

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