The shimano xc7 is an ultra rigid off road racing shoe designed for comfort as well as speed the adaptable cup insole and supple high density synthetic leather with perforated venting ensure a great fit shimano dynalast optimized shoe last the toe spring section of a cycling shoe plays a key role in supporting efficient pedaling too high and it causes increased tension in the plantar calf and hamstring muscles too low and you get a bowlegged inefficient pedaling form extensive res