E4hats Conductor's Cap-Blue White Railroad Train Engineer Hat 100-percent-cotton Made of 100% cotton. L/XL and 2XL/3XL are available with adjustable velcrorized strap. L/XL is based at 7 1/4, fitting from M to XL.2XL/3XL is at 8 and fitting from XL to 3XL. Crown measures 4 inches deep, low profile, unconstructed crown, mesh lined inside. Bill measures 3 inches long, pre curved, same under color.