Description 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 a secure custom fit at the heel. Closure Dual Side mounted Push/Pull BOA IP1 lacing systems