The Shimano RC3 shoes are designed for high performance road riding. The integrated seamless instep and midsole construction sets a new standard for fit, stability and lightweight, while the perforated synthetic leather allows for optimal ventilation. The low-profile, nylon midsole, reinforced with lightweight fiberglass, stabilizes the foot and maximizes power transfer efficiency. The shoes have a reinforced insole and a TPU outsole. The BOA L6 locking system allows fast and secure adjustment with a single finger movement thanks to its easy-to-use dial. These shoes feature the Shimano Dynalast last, an upper design with an optimised toe section that promotes a smoother, more energy-efficient uphill run. Features: Integrated seamless upper and midsole for superior fit, stability and lightweight Perforated synthetic leather upper provides excellent fit and breathability BOA L6, 1 dial closure system, off-center flap-mounted closure system creates a sleeker profile with quick adjustments Wrap-around upper construction reduces overlap and provides a snug fit Low-profile, lightweight glass-fibre reinforced Nylon midsole for improved power transfer Stiffness rating: 6 TPU outsole Reinforced insole Shimano Dynalast last Compatible with SPD-SL cleats Most suitable pedal: PD-RS500 Weight(Size 42): 243g Technologies: Shimano Dynalast Upper design last with an optimised toe section that promotes a smoother, more energy efficient uphill run. Built in collaboration with professional racers, Shimano Dynalast helps reduce energy loss on long rides. BOA L6 Steel cord locking system, nylon guides and a mechanical spool designed to address the long list of shortcomings found in traditional locks. It can be adjusted to perfect perfection with a simple twist, free from the stretch, weight and discomfort of old-fashioned buckles. This system improves comfort along with durability, ensures light weight, fast and comfortable operation, and on-the-go adjustment.