Mens Black Grundies Cycling Undershorts - Fat Lad At The Back
Mens Black Grundies Cycling Undershorts - Fat Lad At The Back

Mens Grundies Black Cycling Undershorts

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A lycra padded undershort with mesh sides to keep you cool. Wear under our Cracking MTB shorts or anything else you might want to cycle in. For best results use our size guide.

  • Product Details
  • Reviews
  • Fitting & Sizing

Our padded Grundies undershorts give you the perfect padding for the Cracking MTB shorts


  • Bespoke YBC high density contoured foam pad specifically for heavier riders and long days in the saddle
  • Panelled construction short for great fit and comfort
  • 4cm elasticated waistband for greater comfort
  • Soft elastic gripper on the inside leg to keep Grundies in place
  • Soft mesh panelling sides to keep you cool
  • Lightweight lycra short


Aim for a snug fit, which holds the pad securely in place against the body, without restricting movement or cutting off the circulation! Our Mens Undershorts should fit high around the waist.

Customer Sizing Feedback

  • Bang on 86%
  • Too big 14%
  • Too small 0%

Top Tips For Getting The Right Size

  1. Get measured before you order - don't rely on your jeans size
  2. Measure your waist at its largest point - usually around your belly button
  3. Drop us an email with your measurements if you need some help
4 34/36" (86-92cm)
5 38/40" (97-102cm)
6 40/42" (102-107cm)
7 42/44" (107-112cm)
8 44-46" (112-117cm)
9 46-48" (117-122cm)
10 50"+ (127cm+)