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 - Silver1725
Adult Small - Slate1725
Adult Medium - Silver18.527
Adult Medium - Slate1927
Adult Large - Silver2027
Adult Large - Slate2027
Adult XL - Silver2228
Adult XL - Slate2228
Adult 2XL - Silver2228
Adult 2XL - Slate22.528