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 - Kelly Green
Adult Small - Gray Heather17.527
Adult Medium - Kelly Green19.528.5
Adult Medium - Gray Heather1928
Adult Large - Gray Heather22.530
Adult XL - Kelly Green23.530.5
Adult XL - Gray Heather2430
Adult 2XL - Gray Heather2631.5