Selle San Marco: Smooth out the roughest MTB trails with the comfortable and supportive Ground Sport, built with Carbon Steel rails. Discover a world of MTB adventures with a saddle designed from the ground up for aggressive terrain. The Ground Sport strikes the perfect balance of providing support and relieving pressure where you need it. With Carbon Steel rails and a wider and softer front end than its competitors, it's comfortable on even the steepest of climbs. The reliable rails and durable Silkfeel material lets you focus on the trail ahead. Sport - Carbon Steel C45 “Reinforced” full steel frame (diameter 07mm) with external paint, light and resistant. All Sport saddles have Carbon Steel Rails. Glass Fiber Reinforced Shell Techno-polymer: engineering polymer with high physical and mechanical characteristics (rigidity, toughness, ductility) that allow it cope with static and dynamic loads and ageing. Silkfeel Cover Silk-soft-touch surface finish, bi-elastic strut material, waterproof and with good abrasive resistance. Easy to wash & clean. Pullfoam Padding Low density foam with variable thickness structure that follows the movements of the pelvis when pedaling, for guaranteed comfort, long lasting resistance and ideal support. FEATURES Weight S3 319 g L3 324 g Dimensions S3 140 x 255 mm L3 155 x 255 mm Rail Carbon Steel Intended use Off-road