S-Phyre SH-RC903 PWR Wide by Shimano

'-Race-Tuned Closure System: BOA Li2 metal dial paired with power boost guide and Velcro toe strap reduces foot movement and enhances power transmission.
-Lock Down: Heel cup with anti-twist stabilization assures optimally secure foot position during intense accelerations and sustained high-cadence efforts.
-Breathability: Variable size perforation holes in upper increase ventilation and add elasticity, helping accommodate a wider variety of foot shapes.
-Optimized Power Transfer: Ultra-stiff carbon sole and low stack height midsole that stabilizes foot results in efficient all-day pedaling performance.