Arm Pad Size Chart (measure bicep around widest point):

XS                   8.25-10"        21-26 cm

S/M                 11-12.5”          28-31 cm

L/XL             12.25-13.5”       31-34 cm

Elbow Pad Size Chart (measure bicep around widest point):

M           11.5-12.75"        28-32 cm

L            12.75-14.5”        32-37 cm

XL         14.5-16”              37-41 cm