Really suprised at the quality of these, they're very nice and have a fitted cut. They're definitely not thick, but not paper thin either, just a nice quality shirt that can be paired with a light jacket on cool days or stands great on its on for mild days. I'm 6'4" and 210 pounds and I ordered a large and it fits perfect. I would order true to size if you prefer the fitted look, or go one size up if you prefer a looser fit.