Protect your prized posterior from 'Soggy Arse Syndrome'. Lightweight, discreet and very effective, the Mini Butt Fender keeps your backside clean, comfortable, and happy.. Available in stealthy black or high-vis reflective for safety-conscious riders, it tucks neatly under the saddle until called into action.. 1 year warranty. Technical Shizzle. • Works well with all bikes with tyres up to 55mm wide. • Fits most standard double-rail saddles.