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 Medium - Lime Green19.528
Adult Large - Lime Green2128.5
Adult XL - Lime Green2330
Adult 2XL - Lime Green2531.5