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 - Bright Yellow2231
Adult Medium - Bright Yellow2131.5
Adult Large - Bright Yellow23.532
Adult XL - Bright Yellow24.532
Adult 2XL - Bright Yellow25.533