inForm Race last - Slightly roomier high-performance fit. Bronze Series Composite sole - Nylon composite sole. PowerTruss - Sole design improves stiffness without adding significant weight. Stiffness index 8. Low-profile precision-ratcheting buckle. Synthetic uppers with flow-through mesh panels. Compatible with both 2-bolt SPD-style and 3-bolt cleats. WSD - Engineered specifically to yield better fit and greater comfort for women.