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 - Neon Yellow17.527
Adult Medium - Neon Yellow2028.5
Adult Large - Neon Yellow21.530
Adult XL - Neon Yellow23.530.5
Adult 2XL - Neon Yellow25.531.5