Koobi's most comfortable triathlon saddle, the Fusion uses slightly softer, thicker foam to cushion the front and sides of the saddle, so you can ride Ironman (or shorter) distances in complete comfort. With a channeled nose that's only 55mm wide (and smooth), the Fusion won't cause chafing, but relieves the perineum from pressure or numbness. The Fusion is short at 233mm long, with a 135mm rear width. Choose steel rails for economy or chromoly rails for a lighter weight ( 278 grams).