Small

22 ^1/2Inches

57 Centimeters

7 ^1/8

Medium

23 ^1/4 Inches

59 Centimeters

7 ^3/8

Large

23 ^1/2 Inches

60 Centimeters

7 ^1/2

One Size (O/S)

22 ^1/2 Inches

57 Centimeters

7 ^1/8

One Size (O/S)

23 ^1/4Inches

59 Centimeters

7 ^3/8

Small/Medium

22 ^1/2 Inches

57 Centimeters

7 ^1/8

Large/ X-Large

23 ^1/4 Inches

59 Centimeters

7 ^3/8

0 - 12 Months

X-Small

19 ^1/4 Inches

49 Centimeters

6 ^1/8

1 - 2 Years

Small

20 Inches

51 Centimeters

6 ^1/4

2 - 4 Years

Medium

20 ^1/2 Inches

52 Centimeters

6 ^3/8

5 -7 Years

Large

21 ^1/4 Inches

54 Centimeters

6 ^3/4

8 - 12 Years

X-Large

21 ^2/3 Inches

55 Centimeters

6 ^7/8

0 - 3 Months

Small

15 ^1/2 Inches

39 Centimeters

5

0 - 6 Months

Small/Medium

16 Inches

41 Centimeters

5 ^1/8

3 - 6 Months

Medium

16 ^1/2 Inches

42 Centimeters

5 ^1/4

6 - 12 Months

Large

17 ^1/2 Inches

44 ^1/2Centimeters

5 ^5/8

1 - 2 Years

X-Large

18 ^1/2 Inches

47 Centimeters

5 ^7/8