After I bought this i was a little skeptical becuase I was nervous about the sizing as I thought I got it too small and it would be too tight and ride up and be chafing. I am 5' 7 and can wear anywhere between a 10 and an 8 and I got it in an 8. But I was soooooo pleasantly surprised. THis shirt has alot of stretch but is a very very fitted shirt (fitted me like a glove) making it ultra sexy yet still easy to get on and off. As for the comfort and breathability, it was phenomenal. WHen i finished my workout, there was not an inch of sweat to be seen and the shirt as fitted as it was, was soo comfortable I honestly forgot I had it on, no chafing or anything. And all the design features under the arms, the back and the front of the shirt make it look very stylish. So for me, this shirt hit the target on every point. Sexy, comfy, dry-fit, stylish, stretchy, excellent quality, doesnt ride up and looks amizing in real life. Easily the coolest looking and fitting gym shirt I have bought to date. Amazing. Thanks Nike! Once again you have impressed me.