Youth Polyester Foam Golf Mesh Cap - Black OSFM 100% Polyester Snap closure Made of 100% polyester and 100% nylon. ONE SIZE fits most for child with adjustable snapback, fitting up to 7. Crown measures 3 1/2 inches deep, 5 panels, constructed, pro style. Bill measures 2 3/4 inches long, pre curved, same color under bill. Soft and light material.