It's all about balance (runs small)

 
XS
S
M
L
XL
2XL
Width, in
13.98
15.00
15.98
16.97
17.99
18.98
Length, in
26.97
27.48
27.95
28.46
28.98
29.49
 A high-quality racerback cut that looks good on anyone's shoulders.
.: 60% combed ringspun cotton, 40% polyester
.: Extra light fabric (3.9 oz/yd² (132 g/m²))
.: Slim fit
.: Tear away label
.: Runs smaller than usual