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 - Navy Heather17.527
Adult Medium - Navy Heather2028
Adult Large - Navy Heather2229
Adult XL - Navy Heather2530.5
Adult 2XL - Navy Heather25.532