Civil War Union Enlisted Kepi Bummer Cap Union Blue A Historic Hat Worn by Union Troops Made from Wool Cloth and is Cotton Lined A Circular, Flat-Topped Cap with a Black Visor A Perfect Touch to Union Soldier Costume Medium: Fits a 7 1/8 inch to a 7 1/4 inch Head Measurement, Large: Fits a 7 3/8 inch to a 7 1/2 inch Head Measurement, X-Large: Fits a 7 5/8 inch to a 7 3/4 inch Head Measurement