Lightweight, fiberglass-reinforced polyamide sole achieves the perfect balance of stiffness and compliance Curved anatomical last provides a natural shoe-to-foot interface Women's specific last features a narrower heel cup, reduced volume, added support at the instep and a smaller toe box Breathable, multilayer mesh design offers excellent ventilation and quick-drying performance Stretch-resistant, reinforced synthetic fibers throughout keep this shoe performing its best Multi-layered heel cup adds stability for a more efficient pedal stroke 2 asymmetrical straps and 1 micro-adjustable buckle eliminate pressure points while maintaining a comfortably snug feel