I don't know what it is about Hanes, but they are almost always somewhat smaller than Fruit of the Loom comparable shirts. I have BOTH medium long sleeve t-shirts like this, and Hanes ones are a bit tighter than the Fruit of the Loom. And Hanes are a bit expensive than Fruit of the Loom. And I measure 5' 8" (height), 30.5" (waist), 160 lbs (weight), and toned but not muscular build. Cotton itself is soft and somewhat strong and comfortable, but the fit is smaller than expected. So if you are buying Hanes, get one size bigger.