Hyperlight xc sole100 made of unidirectional carbon this sole combines extreme stiffness with a record breaking weight because the result of biomechanical studies that allowed northwave to structure the sole only where it was necessary for the pedal stroke the design and the rubber compounds derive directly from michelins competition tires and feature the innovative dual layer compound technology for unmatched traction and abrasion resistance unibody construction with thermoweld protectionl