If a Size XL is tight on your head, you need a 2X or 3X size hat. (See chart for sizes.) This packable hat features a 2 1/2 inch brim. It is made of cotton twill with nylon mesh fabric around the sides of the crown for maximum ventilation. The top of the crown and the brim are solid fabric to protect you from the sun. Usually men with larger heads look good in small brims.