In order to see if the baseball hat will fit you will need to measure your head circumference. Take a sewing measuring tape or you can even use a string. Wrap tit around above you ears and across your eyebrows. Stick your finger under the tape so you have a  little bit of room and that is your head circumference!. If you used a string, match the length to a ruler.Our baseball hats have an adjustable brass buckle and it fits head circumference between 20 1/2 inches to 21 3/8 inches.