Size guide Rukka life jacket

XS	Back up to 30cm / Neck 30-40cm / Abdomen 35-55cm / up to max. 4kg
S	Back up to 40cm / Neck 40-50cm / Abdomen 40-60cm / up to max. 8kg
M	Back up to 50cm / Neck 50-60cm / Abdomen 50-70cm / up to max. 15kg

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