Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Adult Small - Green Heather17.526
Adult Medium - Green Heather2028
Adult Large - Green Heather2229
Adult XL - Green Heather23.531
Adult 2XL - Green Heather2632