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 Heather1726
Adult Medium - Dark Blue Heather1828
Adult Large - Dark Blue Heather20.529
Adult XL - Dark Blue Heather23.530.5
Adult 2XL - Dark Blue Heather2531