XXS- chest: 10", weight(lbs): 3-6
XS- chest: 13", weight(lbs): 6-10
S- chest: 14", weight(lbs): 10-16
M- chest: 17", weight(lbs): 16-30
L- chest: 20", weight(lbs): 30-45
XL- chest: 26", weight(lbs): 45-60
2XL- chest: 31", weight(lbs): 60-80