Lightweight, Stiff and Walkable Shimano SH-RX600 Shoes has been designed with the optimal balance of stiffness and walkability. This shoe is the perfect fit if you are up for gravel race or for an all-day adventure ride. Stiff Carbon Composite Sole The super stiff sole is made of a carbon composite and helps you apply all your power through your pedals. Specifically engineered for gravel riders the shoes offer the rider an SPD pedal system in a hybrid road/mtb shoe. This provides the desired pedal platform that balances pedal performance with the need for added grip and the ability of the rider to be able to walk on lose surfaces. The upper compound aims to provide a balance of holding power whilst still be comfortable for long days in the saddle.