Sizing:

• 16"41cm - Fits Neck up to 39cm / 15.4"
• 18" 46cm- Fits Neck up to 44cm / 17.4"
• 20" 51cm-  Fits Neck up to 48cm / 19"
• 22" 56cm-  Fits Neck up to 53cm / 20.8"
• 24" 61cm-  Fits Neck up to 56cm / 22"
• 26" 66cm- Fits Neck up to 61cm / 24"