Glow in the dark! How fun is that. Whimsical footbed prints actually glow in the dark, for beach nights and fireworks. The Reef Ahi Glow boys sandals have a synthetic strap with soft polyester lining for kid's comfort and a durable high-density EVA outsole for the grom who doesn't stop (but is easy to find after sunset.) Only sizes 3/4, 5/6, 7/8 and 9/10 come with a removable synthetic backstrap