ALL our items are available for immediate delivery!
S Back 25cm/ Chest 33-43cm/ Stomach 36-46cm/ Weight up to max. 6kg
M Back 30cm/ Chest 43-56cm/ Stomach 46-61cm/ Weight up to max. 10kg

Back = back length
Neck = neck circumference
Chest = chest circumference
Belly = waist circumference

Image with information on how to measure your dog correctly