MX Race Last –Featuring a slightly narrower toe box & tighter heel than the Competition last and less overall volume than the Sport last. Designed for a slimmer fit & most suitable for racing.OUTSOLE Lake SPD compatible 100% Carbon Fiber Sole with real rubber tread and provisions for replaceable toe spikes.UPPER Helcor Leather for extreme durability. Outlast temperature regulating heel & tongue liner. Internal Thermaform Carbon Fiber heel counter for secure custom fit at the heel.CLOSURE Dual Side mounted Push/Pull BOA IP1 lacing system