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Hat sizes may look strange but they are not difficult to understand. The number is the "average" diameter of your head in inches. Since this isn't a very easy size to measure directly (few people's heads are perfectly round!) the easiest thing is to measure the distance around your head just above your eyebrows. Then look up your hat size using the following chart.
Hat Size Inches Metric (cm) XS 6 1/2 20 1/2 52 6 5/8 20 3/4 53 S 6 3/4 21 1/8 54 6 7/8 21 1/2 55 M 7 21 7/8 56 7 1/8 22 1/4 57 L 7 1/4 22 5/8 58 7 3/8 23 59 XL 7 1/2 23 1/2 60 7 5/8 23 7/8 61 XXL 7 3/4 24 1/4 62 7 7/8 24 5/8 63 XXXL 8 25 64