US Navy Military Patched Mesh Cap - Seabees 3 W43S67F Other Made of 65% polyester and 35% cotton, mesh back. ONE SIZE fits most with adjustable plastic snap closure, fitting up to XL. Crown measures 4 inches deep, structured, 6 panels, prostyle, 4 panels in mesh back. Bill measures 3 inches long, stiff and pre curved bill, same color under bill. Thick, cool and light material.