Size Chart:
XF-60: Chest 26"-28", Shoulders 10"-11", Weight 60-80 lbs
XF-80: Chest 28"-30", Shoulders 11"-12", Weight 80-100 lbs
XF-100: Chest 30"-32", Shoulders 12"-13", Weight 100-130 lbs
XF-130: Chest 32"-34", Shoulders 13"-14", Weight 130-150 lbs
XF-150: Chest 34"-36", Shoulders 14"-15", Weight 150-180 lbs