Made from 100% unidirectional carbon, the PowerShape Carbon 15 sole features the unique Powershape® system in the arch of the foot, ensuring that 100% of the rider's power is transferred to the pedals without wasted energy. With a stiffness index of 15.0, this sets a new benchmark for road sole performance. NW Speedplay compatible adapter for the lowest stack height between foot and pedal Built with patented X-Frame 2® construction, the upper transfers every watt of power while providing the snug, most even fit without pressure points. The SLW2 dual dial differentiates pressure between the instep and toe for even better adjustability. The integrated heel system containing directional fiber prevents any slippage The Pro Regular Fit insole with a rigid dual-density design increases power transfer