OTTO Solid Comfy Cotton Jersey Knit Mesh Back Cap - Charcoal Grey 100% Cotton Made of 100% cotton and 100% nylon mesh. ONE SIZE fits most with adjustable strap closure, fitting up to 7 1/2. Crown measures 3 1/2 inches deep, structured, 6 panels, lowprofile, 4 panels in mesh back. Bill measures 3 inches long, pre curved, same color under bill. Thick, stiff, soft and light material.