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 - Red1829
Adult Medium - Red2030
Adult Large - Red22.529
Adult XL - Red23.532
Adult 2XL - Red2633