OTTO Washed Solid Pigment Dyed Cotton Twill Brass Buckle Cap 100% Cotton Made of 100% cotton. One size fits most with adjustable buckle closure, fitting up to XL size. Crown measures 3 1/2 inches deep, 6 panels, unconstructed, low profile. Bill measures 2.7 inches long, pre curved, same color under bill. Thick, soft and light material.