If you are not familiar with the BELLA + CANVAS brand, it will undoubtably become your new favorite brand. They are super soft and a perfect weight...not too heavy and not too light.
 
You can refer to the size chart above but I think they tend to run a little big big. With that being said, order your normal size unless you are between sizes in which case I would go down a size.
 
Retail fit
Tear-away label
Side seamed
Ribbed cuffs
Athletic Heather: 90/10 Airlume combed and ring spun cotton/poly