I'm 5'11", 165lbs, slim-muscular build. The medium fits me well, but with no room to spare. You can see through the material, hence the 3 stars. I doubt this t-shirt will be durable, and instead, feels like a fast-fashion piece. I bought the black and grey shirts. The black is a dark purple, which I like. The grey is what you see. I'll keep them for the summer, since they do fit well.