XS Lace length 15cm, strap length 40cm, suitable for neck length 15-20cm and weight 0-2kg

S Lace length 20cm, strap length 40cm, suitable for neck length 20-25cm and weight 2-3kg

MLace length 25cm, strap length 60cm, suitable for neck length 25-30cm and weight 3-5kg

LLace length 30cm, strap length 60cm, suitable for neck length 30-35cm and weight 5-12.5kg

LLace length 35cm, strap length 60cm, suitable for neck length 30-35cm and weight 5-12.5kg