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 - Dark Blue Heather17.527
Adult Medium - Dark Blue Heather19.528.5
Adult Large - Dark Blue Heather2229.5
Adult XL - Dark Blue Heather2331
Adult 2XL - Dark Blue Heather2530.5