Inches:

20-3/4

21-1/8

21-1/2

21-7/8

22-1/4

22-5/8

23

23-1/2

23-7/8

24-1/4

24-5/8

25

25-1/2

Hat Size:

6-5/8

6-3/4

6-7/8

7

7-1/8

7-1/4

7-3/8

7-1/2

7-5/8

7-3/4

7-7/8

8

8-1/8

Metric Size:

53

54

55

56

57

58

59

60

61

62

63

64

65