Size Chart:
M    = 38-40 Inch Chest, 15-15.5 Neck, 33/34 Sleeves
L     = 40-42 Inch Chest, 16-16.5 Neck, 34/35 Sleeves
XL   = 44-46 Inch Chest, 17-17.5 Neck, 35/36 Sleeves
2XL = 48-50 Inch Chest, 18-18.5 Neck, 36/37 Sleeves
3XL = 50-52 Inch Chest, 19-19.5 Neck, 36/37 Sleeves