I usually struggle with dress shirts. when I buy small or med (based on their sizing) the sleeves are too short and the body to bulks/loose. I am 5'9", 130 lbs (a thin cyclist) and this shirt fits great. sleeves are perfect length, body all though not tight or snug, is not loose, which is perfect. so much so that I bought this shirt in a 2nd color after the first arrived.