Ergon SF Men's Saddle. Features: Ergonomic comfort saddle for fitness and commuter bikes Optimally tuned for an athletic riding position Rearward positioned and anatomically adapted pressure relief channel prevents discomfort and numbness SF Sport Gel: Nylon composite shell with orthopedic comfort foam padding and gel inserts for optimum pressure relief SF: Nylon composite shell with orthopedic comfort foam padding Specs: Model:SF Sport Gel Rails:CrMo Top:microfiber Color:black Size:S/M Weight:340g