reference
Model S: Bust 45-51CM, neck circumference 40-48CM, weight 12.5KG within
Model M: Bust 52-60CM, neck circumference 45-54CM, weight 12.5KG-20KG
Model L: Bust 63-77CM, neck circumference 54-67CM, weight 20.5KG-35KG
Model XL: Chest 72-91CM, neck circumference 60-70CM, weight 35.5KG-60KG