Size Guide

 

Size	Circumference (mm/inch)	Inner Diameter (mm/inch)
S	54 mm / 2.125 in	17 mm / 0.669 in
M	56 mm / 2.204 in	18 mm / 0.708 in
L	60 mm / 2.362 in	19 mm / 0.748 in
XL	62 mm / 2.440 in	20 mm / 0.787 in

 

Round up if you are in between two sizes.