XS (1-1.5 KG, length: 20cm, chest circumference: 30cm)
S (1.5-2.5 KG, length: 25cm, chest circumference: 35cm)
M (2.5-4KG, length: 30cm, chest circumference: 40cm)
L (4-5.5 KG, length: 35cm, chest circumference: 45cm)
XL (5.5-7KG, length: 40cm, chest circumference: 50cm)