XS

6 ⅝" - 6 ¾"

20 ⅞"-21¼"

53 - 54

S

6 ⅞" - 7"  

21 ⅝" - 22"

55 - 56

M

7" - 7 ¼ "

22  ½" - 22 ⅞"

57 - 58

L

 7 ⅜" - 7 ½"

23 ¼" - 23 ⅝"

59 - 60

XL

7 ⅝" - 7 ¾"

24 - 24 ½

61 - 62

Measuring the circumference of the head should be measured 
approximately one inch above the eyebrows and at a point in the 
back of the head that gives you the largest possible measurement.