DPC/Scalar Removable Flap Hat-Khaki W15S46F 100% Nylon Made from 100% nylon. One size fits most with adjustable buckle clip closure, fitting up to XL. Crown measures 4 inches deep, unstructured, side mesh panels, with chin string. Bill measures 4 inches long and 8 inches wide, flat, same color under bill. Back flap measures 10 inches long and can cover front neck.