With a perfect racer fit, the carbon sole maximizes the energy transfer on the pedal and the sleek lines fit the foot perfectly while the perforated inner sole keeps you cool. We've thought of everything! Read the technical sheet, you'll be impressed too. Technical Details: - Technology: RACER FIT: High-performance fit reduces stack height to pedal - Integrated X-Comfort Zone technology with better stretch - Outsole: Patented Carbon Composite outsole - Insole: COOLMAX®: Moisture-wicking, breathable, and ventilated - Closure System: Boa Li2: mechanism generates higher power with finer resolution - Cleats: SPD-SL compatible with 3 bolt