The straps can be adjusted to fit a variety of shoe sizes. Each strap is held in place by a spring-loaded clip that is connected to the outer edge of each pedal. To tighten a strap, simply pull the loose end of the strap down. It automatically locks into place with each pull. To loosen a strap, press down on the top of the clip and pull the strap up. Release the clip to lock the strap into place. Test the adjustment, and change if necessary.