Extra Small - US 7, EU 22
Fits the average 5-6 year old boy
Small - US 8 , EU 24
Fits the average 7-8 year old
Medium - US 10, EU 26
Fits the average 9-10 year old
Large - US 12, EU 28
Fits the average 10-11 year old
Measurements
XS - Chest 15.5 inch, Length - 22 inch
S - Chest 16.5 inch, Length - 23 inch
M - Chest 17.5 inch, Length - 24 inch
L - Chest 18.5 inch, Length - 25 inch