XS- chest: 12", weight(lbs): 3-6
S- chest: 14", weight(lbs): 6-10
M- chest: 16", weight(lbs): 10-16
L- chest: 19", weight(lbs): 16-30
XL- chest: 26", weight(lbs): 30-45
2X- chest: 34", weight(lbs): 45-60
3X- chest: 40", weight(lbs): 60-90