Synthetic/Textile/Mesh,Breathable and quick dry upper Closed-toe athletic sandal offers kids the best protection, perfect for the beach, pool or any summer sports Adjustable hook-and-loop closure for superior fit and adjustability No worry to ordered a half size bigger, because there's a back adjustable strap to make feet tighter Leather lined stitched in footbed,comfortable and no foot odor.Insole built in arch support,provide good support,Prevent flat feet.