This FlexFit closed back hat is available in two sizes. With an elastic stretch band, this hat is a sure winner in comfort! It has an athletic shape with a curved visor. It'll be the most comfortable and well shaped hat you'll ever own! S/M fits a head circumference of 21" - 22½" (or hat size 6 3/4 - 7 1/8). L/XL fits a head circumference of 22½" - 24" (or hat size 6 3/4 - 7 5/8).