Apparel might be larger in size than typically expected. It could be beneficial to opt for a size smaller than you normally would.
 
NOW Courier logo affixed. 

Features: matching flat-knit collar, three-button placket, side slits;
Material: 4.1 oz/yd² / 139 gsm, 100% polyester piqué with moisure-wicking, antimicrobial and UV protection performance.
 
Size Chart:
How to measure chest: Measure just under the arms, across the fullest part of the chest, around shoulder blades, holding measuring tape firm and level
 
S: 35-38" chest
M: 39-41" chest
L: 42-45" chest
XL: 46-49" chest
2XL: 50-52" chest
3XL: 53-56" chest
4XL: 57-60" chest
5XL: 61-64" chest