75% Cotton 25 % Polyester The Bull's Eye is Made of Aluminium The Bull's Eye is Attach to the Cap by Bolt and Screw M size: Head circumference (57cm), US cap size (7-7 1/8). L size: Head circumference (59cm), US cap size (7 1/4-7 3/8). XL size: Head circumference (61cm), US cap size (7 1/2-7 5/8) Ships Worldwide. Replica version of the popular Imperial Officer Cap from the Galactic Empire. M size: Head circumference (57cm), US cap size (7-7 1/8). L size: Head circumference (59cm), US cap size (7 1/4-7 3/8). XL size: Head circumference (61cm), US cap size (7 1/2-7 5/8)