3XL is 28” FROM ARM SEAM TO ARM SEAM
2XL is 26” FROM ARM SEAM TO ARM SEAM
XL is 24” FROM ARM SEAM TO ARM SEAM
L is 22” FROM ARM SEAM TO ARM SEAM
M is 20” FROM ARM SEAM TO ARM SEAM
S is 18” FROM ARM SEAM TO ARM SEAM