XS code: lace length 15CM, strap length 20CM, suitable for 15-20cm neck circumferenceS code: lace length 20CM, strap length 20CM, suitable for 20-25cm neck circumferenceM size: lace length 25CM, strap length 20CM, suitable for 25-30cm neck circumferenceL size: lace length 30CM, strap length 20CM, suitable for 30-35cm neck circumferenceXL size: lace length 35CM, strap length 20CM, suitable for 35-40cm neck circumference