Ergonomic MTB comfort saddle designed specifically around the female pelvis Forward positioned and anatomically adapted relief channel prevents discomfort and numbness Thicker and softer padding than SM models SMC Sport Gel: Nylon composite shell with orthopedic comfort foam with gel inserts for optimum pressure relief SMC: Nylon composite shell with orthopedic comfort foam padding Recommended sizing for sit bone width: S/M 912cm, M/L 12-16cm