Head size is based on the circumference of the head. You should be able to find your size in the following chart if you measure around your head where you would like the hat to rest. We recommend the metric size as the most accurate translation of size. Always get the hat a little big if you measure between the sizes. The tendency of a hat is to shrink over time, not stretch. Do not start out too small.

"NAMED" SIZES	METRIC	AMERICAN	NEAREST INCHES (8ths)
X-SMALL	52 53	6 1/2 6 5/8	20 2/8 20 6/8
SMALL	54 55	6 3/4 6 7/8	21 1/8 21 4/8
MEDIUM	56 57	7 7 1/8	21 7/8 22 2/8
LARGE	58 59	7 1/4 7 3/8	22 5/8 23
X-LG	60 61	7 1/2 7 5/8	23 4/8 23 7/8
2X	62 63	7 3/4 7 7/8	24 2/8 24 5/8
3X	64 65	8 8 1/8	25 25 3/8

After you find the correct size; consider the shape of your head. We call this the oval. If you can usually try on the size you measure and the hat fits comfortably all around you are probably a regular oval. If hats are always tight on the sides and loose front to back you are a round oval. If hats always squeeze your forehead and there is room to spare on the sides, you're a long oval.