Shimano SH-RC903 S-Phyre Bicycle Shoes Every Watt, Where It Belongs Road racers who want zero energy wasted between foot and pedal have a clear choice at the top of the S-Phyre line. The RC903 starts with a 360deg surround wrapping upper built from microfiber leather that is rigid toward the heel for lockdown and more flexible through the forefoot for comfort on long efforts. DYNALAST geometry optimizes the toe-spring angle to reduce tension through the calves and hamstrings, so your legs stay fresher deeper into a ride. Two BOA Li2 dials run a figure-eight crossover lace pattern that lets you micro-adjust fit zone by zone, on the fly, without pulling over. The result is a shoe that races at the World Tour level and is comfortable enough for a four-hour Saturday ride. Features Carbon fiber sole, stiffness index 12 maximum rating on Shimano's scale for direct, lossless power transfer Dual BOA Li2 dials with figure-eight crossover lacing independent forefoot and midfoot/ankle micro-adjustment, bidirectional on the fly Anti-twist stabilizing heel cup locks heel in place during sprints and hard accelerations to prevent lateral movement DYNALAST construction with optimized toe-spring section reduces tension in plantar fascia, calves, and hamstrings through the pedal stroke Microfiber leather upper with perforated mesh toe panel zone-specific rigidity and flexibility with ventilation at the toe and heel360deg surround wrapping upper with refined toe box accommodates a wider range of foot shapes than previous S-Phyre generations | Shimano | Sh-Rc903 S-Phyre Bicycle Shoes Men's | Size 38 In Blue