Thanks to the twist closure, you are as fast in your RD SYDRIX PRO as you are on the road. This is also helped by the CUBE Anti-Slip System, which keeps the heel in place - so your power is really transferred one-to-one to the pedals. The asymmetric design distributes the pressure optimally, even under heavy load. Dirt doesn't stand a chance on the repellent upper material, under which heat doesn't build up thanks to the ventilated tongue.