Orvis Men's Pro Shirt Size Chart

SizeChestNeckArm Length*
S34 - 36 in.14 1/2 in.33 in.
M38 - 40 in.15 - 15 1/2 in.33 1/2 - 34 in.
L42 - 44 in.16 - 16 1/2 in.34 1/2 - 35 in.
XL46 - 48 in.17 - 17 1/2 in.35 1/2 - 36 in.
2XL50 - 52 in.18 - 18 1/2 in.36 1/2 - 37 in.
*Measured from the center of your back