"The Nike Sunray Adjust 4 Infant/Toddler Sandal is quick-drying and comfortable with a synthetic upper and lightweight Phylon foam midsole, ideal for a busy day in the water and on the beach. Quick-drying synthetic upper offers a natural feel Hook-and-loop fasteners at heel and top of foot for easy on and off Phylon midsole for lightweight cushioning and flexibility Outsole features non-marking rubber in high-wear areas for traction and durability