The Ahi Glow sandal by Reef features a printed EVA footbed with sharks that glow in the dark. A synthetic strap with a comfotable polyester lining, and a durable high density rubber outsole complete the package.Reef labels the sandal sizes as 11/12, 13/1, 2/3 and 4/5. To order a 11/12, select size Toddler 11. To order a 13/1, select size Toddler 13. To order a 2/3, select size Youth 2. And to order a 4/5, select size Youth 4.