Tailored to the features of male anatomy and optimized for the requirements of mountain biking Narrow and short Vshaped seating surface ensures optimum freedom of movement and position shifts Rearward positioned and anatomically adapted pressure relief channel prevents discomfort and numbness Padded edges on Comp and Pro models SM Enduro Pro: Carbon composite shell with orthopedic AirCell foam SM Enduro Comp: Nylon composite shell with orthopedic AirCell foam SM Sport: Nylon composite shell with orthopedic comfort foam Recommended sizing for sit bone width: S/M 912cm, M/L 12-16cm