Product size
Size/cm Width * height * head circumference/cm weight recommendation
S 36 * 31 * 20 S (suitable for 1.5-2 kg pets)
M 40 * 35 * 24 M (suitable for 2.5-5 kg pets)
L 45 * 40 * 30 L (suitable for 5-7.5kg pets)
* The size is the actual outer diameter, and it is normal to have an error of 2-3cm in manual measurement.