Patented ‘S’ Stirrup Positioning Technology. The MDC ‘S’ Classic™ is designed for riders who appreciate the classic lines and benefits of a traditional stirrup. The MDC ‘S’ Classic™ features our patented 45° ‘S’ positioning Technology. Combined with our ultra-low profile, high traction aluminum tread, the MDC ‘S’ Classic™ delivers improved stirrup and leg position, greater base of support, relieves pressure on ankles, knees, hips and back, is easily retrievable and safer in the event of a fall. The MDC ‘S’ Classic™ is the stirrup for the next generation of performance riders and trainers.