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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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Size: Select a size
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

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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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Alright ! Undershorts…

Alright ! Undershorts worn by my dad on each of his bike rides. It is very comfortable and makes accumulating kilometers pleasant.

Very practical for mitigating…

Very practical to alleviate soreness in the buttocks!!!

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good value for money


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There wasn't much to choose from, so I chose the budget version of the shorts. Moderately comfortable, but for the price it's ok and meets basic needs. However, it is probably better to spend a little more and buy a better copy

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It protects you comfortably, especially during our training sessions of up to 4 hours.

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Simple and pleasant to wear


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The protection sticks excessively to the bottom and when you get off the bike it is very annoying. Pedaling well, for a maximum of 2 hours

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Does what it should

The underpants with padding distribute the saddle pressure well, but are a size smaller - I needed XL. For normal sizes I need L, otherwise the leg openings are quite tight.

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These under shorts are…

These under shorts are comfortable and easy to maintain.

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Great under pants in winter

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Foam makes you sweat

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Only for a short time "Good"

After a few months of use, the padding shifts within the lining fabric with each wash and can only be correctly repositioned with a lot of patience.

Definitely not a north American size large

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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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