XS Neck Size 20 - 27cm, Width 2cm   (8" - 10 1/2", Width 7/8")

S Neck Size 27 - 35cm,  Width 2cm    (10 1/2" - 13 3/4", Width 7/8"

M Neck Size 35 - 44cm,  Width 2cm   (13 3/4" - 17 1/4", Width 7/8")

L Neck Size 44 - 53cm,  Width 2cm    (17 1/4" - 20 3/4", Width 7/8")

XL Neck Size 53 - 63cm,  Width 2cm  (20 3/4" - 24 3/4", Width 7/8")