The three carbon layers drastically reduce thickness, decreasing the distance between the foot and pedal and increasing stiffness. AirFlow vents in the sole provide an improved supply of fresh air and prevent the sole from overheating. The WLI Wood Lasting Insole wooden arch support is a Northwave exclusive: it's the added value in our shoes. The bonded layers of wood reduce vibrations and insulate the foot from any possible overheating of the sole. The structure offers flexibility to adapt to the shape of the foot, and stiffness for enhanced power transmission to the pedals.