Mountain Bike Undershorts EXPL 700 - Black

Ref. : 8677509

These mountain biking undershorts were designed for your mountain biking rides lasting 5 hours on average

The new anatomic pad adapts perfectly to your body type for maximum comfort and minimum chafing

Color: black

  • UK 30" / EU S Out of Stock
  • UK 32" / EU M undefined
  • UK 34" / EU L Out of Stock
  • UK 37" / EU XL Out of Stock
  • UK 41" / EU 2XL Out of Stock

Our services :

  • Free delivery for Decathlon brands orders above $399
  • All Decathlon products are eligible for lifetime return

Products benefits

Sitting comfort

Ride comfortably for up to 5 hours with the anatomic foam pad (14 mm).

Moisture management

Actively wicks away perspiration to the outer surface for quick drying


Ergonomic design and responsive, stretchy fabric provide good support.


Elastane in the fabric to guarantee ease of movement.


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


230 g in size L.

Technical information


Theo is wearing a size M. He weighs 77 kg and is 185 cm tall.

In a nutshell

Pad thickness: 14 mm
Pad density: 100 kg/M3
Pad firmness: 35 KPa


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.


This pad is designed for intensive users.
The foam pad is firm. Provides good user comfort and protects the cyclist's pressure zones for rides of up to 5 hours.

Foam thickness: 14 mm
Foam density: 100 KG/m3
Foam firmness: 35 KPa


To prevent irritation, we recommend washing it like underwear.

Shorts / Undershorts:
When you're riding, your shorts and undershorts should not 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

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.


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


2 years

Product concept & technology

Product Composition

Main fabric 72% Silicone, 28% Elastane Yoke 83% Silicone, 17% Elastane Foam 65% Polyurethane, 17.2% Silicone, 15% Polyamide, 2.8% Elastane


Store in a clean and dry place.


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.

Maintenance advice

Machine wash - 30° max - normal

Do not bleach

Do not tumble dry

Do not iron

Do not dry-clean

User reviews

Questions & Answers