Performance Posture 3 for pelvic rotation with a balance of comfort and efficiency. The Women-Specific Design is engineered to yield better fit and comfort for women. 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. Hollow chromoly rails. Nylon composite shell. The abrasion-resistant material is durable at vulnerable spots for increased saddle life.