300 Cycling Bib Shorts



Made for occasional cycling in warm/hot weather (1-hour rides).
The B'Twin 100 men's bibless cycling shorts offer good comfort for getting started with cycling thanks to a preformed foam pad and stretchy material that provides plenty of freedom of movement.
Sizes guide

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Sitting comfortPreformed foam pad.
Moisture managementBreathable material for greater comfort.
Freedom of movementStretch fabric ensures shorts stay comfortably in place at the waist and thighs.
Warranty2 Years
Technical Information

Care tips
Machine wash at 30°C. Synthetic programme. Turn the garment inside out. Use minimal laundry detergent. Do not add softener. Line dry in a warm, ventilated area. Do not tumble dry. Do not dry clean. Do not bleach. Do not place on a heater to dry.
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. We then test our products in the field, as we are convinced that only by subjecting them to real world conditions, like the ones you experience on your bike, can we continuously improve our products.
Information / Concept / Technology
Main fabric : 85.0% Polyester (PES), 15.0% Elastane Padding : 56.0% Polyester (PES), 40.0% Polyurethane (PU), 4.0% Cotton

Maintenance tips
Machine washable, do not tumble dry.


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Rip in seam and too small
Used for 1 week or less
There was a rip in the seam (before husband even tried them on). The size guide is also incorrect. I had the same issue as Ian. There must be two size guides on the site - small is definitely not big enough for a 30inch waist. Husband has some other small men BTWIN cycling shorts from decathlon and they are much bigger and fit fine - what happened here?
Style is good
See above
Response of the brand
I'm sorry that your experience with the shorts has not been positive.
I agree with you that the sizing is not clear enough. More effort needs to be made on our behalf to improve this point.
Generally speaking a 30" waist at Decathlon is M, 32" is "L", 34 is "XL" etc....
Please return them to us for a refund/replacement as the seam coming apart means they are defective.
Peter Lazarus UK Cycling Market Manager DECATHLON
Comfortable perfection
Used for 1 week or less
Had to exchange my original. The customer service over the phone and clear instructions, quick delivery is on par, very good.
The shorts itself has evolved from stringy plastic quad stranglers to hugging comfortable material at the end of the short (as you can see in the pictures). Having big quads, I've finally found a piece of cycling kit that is perfect fitting. When I compliment, you've done your job well! Thank you decathlon.
Comfortable, cheap, good customer service
Cycle shorts
Verified purchase What is a review "Verified purchase" ?

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Used for 2 to 8 weeks
Would be handy to have elastic on legs
Wash well, comfortable and lightweight
Lack of elastication on legs, don't fit snugly
Poor sizing
Used for 1 week or less
The size guide states that the size small fit 78cm - 81cm but on arrival the label says 74cm - 77cm and they are too small for my son.
The shorts on the whole look and feel fine for the money, you get what you pay for.
Unable to review how comfortable they are due to the misleading size guide.
The size guide on the website differs to the produ
Response of the brand
Hi Ian,

Sorry to hear that the size isn't suitable for your son. I have had a check on the size guide on our website and it says that the Small is a 74-77.
I have linked the size guide for you.


Rob Basnett b'Twin Product Expert DECATHLON
Ian not found this answer helpful
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