Kaisifei Military Bucket Sun Boonie Hat Cap Woodland Camo Imported Brim about: About 60mm / 2.36" Diameter about: 640mm-660mm/25.5" Head Circumference about: About 600mm / 23.62" Rope Length about: About 340mm / 13.39" Material about: 55% Cotton / 45% Poly; Adjustable drawstring for fixing the hat, especially in windy days