Selle San Marco: Smooth out the roughest MTB trails with the comfortable and supportive Ground Dynamic, built with Maganese rails. Discover a world of MTB trails with a saddle designed from the ground up for aggressive terrain. The Ground Dynamic strikes the perfect balance of providing support and relieving pressure where you need it. With Maganese 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.Dynamic - ManganeseHigh-tech hollow ChroMoly rails (outer Ø 7 mm - inner Ø 4 mm) + external painting, light and resistant. All Dynamic saddles have Manganese Rails.Glass Fiber Reinforced ShellTechno-polymer: engineering polymer with high physical and mechanical characteristics (rigidity, toughness, ductility) that allow it cope with static and dynamic loads and ageing.Silkfeel CoverSilk-soft-touch surface finish, bi-elastic strut material, waterproof and with good abrasive resistance. Easy to wash & clean.Pullfoam PaddingLow density foam with variable thickness structure that follows the movements of the pelvis when pedaling, for guaranteed comfort, long lasting resistance and ideal support. FEATURESWeightS3 271 g – L3 276 gDimensionsS3 140 x 255 mm – L3 155 x 255 mmRailManganeseIntended useOff-road