Made of 100% polyester. ONE SIZE fits most with elastic closure, fitting up to XL. Crown measures 4 inches deep, with 2 sides mesh, fully lined with mesh. Brim measures 3-1/2 inches wide, flat and stiff. Flap measures 9 inches long, 13-1/2 inches wide with string clip. Thin, soft and cool material. Hand wash only. Available in olive and k...