XS code width 1.5CM total length 30CM (suitable for neck circumference of16-22CM) S code width 1.5CM total length 36CM (suitable for neck circumference of 22-28CM) M code width 2.0CM total length 40CM (suitable for neck circumference of 24-32CM) L code width 2.0CM total length 50CM (suitable for neck circumference of 32-40CM)