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 Small17.5024.50
Adult Medium 19.5029.50
Adult Large 2230.50
Adult XL 23.5032
Adult 2XL 24.5033
Adult Small - Natural