Carbon Light sole made of carbon and fibreglass with a stiffness index of 10.0 and 4 vents for constant airflow. NW Speedplay adapter compatible for the lowest stack height between foot and pedal. BioMap unibody upper made of ultralight PU eliminates hotspots. Double SLW2 dial, the only one with step-by-step and full release in a single button that provides optimal pressure distribution. Integrated heel system ensures efficient heel retention.