Circumference(cm)

Size

cA

cC

cE

cG

S

16-19.5

13-15

20-25

22-30

M

18-21.5

15-17

23-28

25-33

L

20-23.5

17-19

26-31

29-37

XL

22-25.5

19-21

29-34

33-41

XXL

24-27.5

21-23

32-37

37-45