Air Force Patch Cap - Thunderbird W43S68F Other Made of 65% polyester and 35% cotton. One size fits most with adjustable plastic snap closure, fitting up to 7 1/2. Crown measures 4.5 inches deep, 6 panels, constructed, high profile. Bill measures 2 3/4 inches long, pre curved and stiff bill, same color under bill. Thick, soft and light material.