The carbon fibre features a replaceable heel stud to help prolong service life. Twin disc fastening allows both fast entry and exit and an extremely secure closure, reinforced by a hard-wearing Dyneema ® wrap layer for durability even in the harshest conditions. The toe box and heel cap are both reinforced for extra protection, the bovenwerk is perforated to provide ventilation, and an Natural Fit-inlegzool ensures the best possible cushioning and pressure distribution for optimum pedalling.Super stiff carbon soleDial knob closureErgonomic Natural Fit lastNatural Fit insoleDyneema reinforced wrap closureAsymmetric designReinforced toeReplaceable heel piece3-point attachment for clipless pedals (SPD-SL, Look etc.)Dirt-resistant upperVentilated tongueReflective applications on the heelStiffness index: 10