This listing is for a SET OF 4 U.S. Welder Welding Caps. Set includes ONE EACH of GREY barbed wire, camo, houndstooth and flag designs. Brand New With Tags, U.S. WELDER welding hat.100% cotton.U.S. Welder welding cap is made by Comeaux SupplyUse this chart for sizing.Inches In CircumferenceCentimetersExtra Small6 1/2….21.25 to 21.375″53.43756 5/8….21.375 to 21.5″53.75Small6 3/4….21.50 to 21.625″54.06256 7/8….21.625 to 21.75″54.375Medium7……….21.75 to 22.125″55.31257 1/8….22.125 to 22.5″56.257 1/4….22.50 to 22.875″57.1875Large7 3/8….22.875 to 23.25″58.1257 1/2….23.25 to 23.625″59.06257 5/8….23.625 to 24″60Extra Large7 3/4….24 to 24.375″60.93757 7/8….24.375 to 24.75″61.8758……….24.75 to 25.125″62.8125