Fitness Posture 4 features an upright pelvic rotation to go further, faster;The FlexForm design allows the saddle to pivot with the rider’s natural pedal stroke;The Contour Relief Zone (CRZ) recessed saddle cavity eases pressure on soft tissue;Size-Specific Curvature ensures that each saddle is designed specific to its width;inForm BioDynamic products optimise your natural movement for sustained, higher performance;