If you're looking for one package that offers maximum stiffness and minimal weight at once, the SCOTT MTB RC EVO is your shoe of choice. Primed for pure efficiency, it features a seamless, ultra comfortable TPU airmesh laminate upper. The dual-zone Boa® Fit System IP-1 allows on-the-fly adjustability at the ankle and at the forefoot. For optimal sole support, the ErgoLogic insole features an adjustable arch support and metatarsal button. The stiff HMX Carbon fiber sole has a stiffness index of 10 (our stiffest, for pure efficiency).