SIZE RUNS BIG!!!!!! Port & Company Unisex Performance Model:PC380 Weight:3.8 Oz 100% Polyester Sizes: XS, S, M, L, XL Measurements (in inches)XSSMLXL Chest Width 17 ½ 19 20 ½ 22 23 ½ Body Length 27 28 29 30 31 Sleeve From Shoulder 16 ¾ 17 ½ 18 ¼ 19 19 ¾