With a unique high-performance design, the Shimano RC903 Limited Edition S-PHYRE Cycling Shoe is designed to help us ride faster, stronger, and longer. Chasing down breakaways barely poses a challenge with the optimal power transfer delivered from the stiffness level and precise fit from the dual low-profile BOA Li2 metal dials and crossover lacing pattern. We can also be sure our foot will stay in the shoe securely with DYNALAST technology and an anti-twist heel cup designed to stabilize our heel as we make a big jump out of the saddle for a big acceleration.