Designed and engineered with the latest materials optimized for ventilation and low aerodynamic drag, the Mavic CXR Ultimate II Road Shoes feature a CXR Aeroflap that covers the foot, reducing drag and saving energy, so you can stay fast. The CXR Aeroflap has two large ventilation windows and perforated fabric across the upper to improve cooling and temperature regulation. Energy Full Carbon SLR outsole with extremely thin construction provides optimal stiffness and positions the foot close to the pedal for maximum efficiency. Energy Lock Carbon 3D enhances heel hold while seam-free Ergo Bonded upper gives premium comfort. Ergo 3D Tongue with open 3D mesh prevents overheating. Ergo Fit 3D+OrthoLite inner sole increases foot support during the pedal stroke, thanks to ergonomic construction and superior cushioning. Dual Ergo Dial retention system creates a super secure fit and allows highly accurate and fast adjustment.