My son is tall 5'8" and a little thick but a medium on him looked like he was playing "dress-up". The sleeves were way too long, enough so that we determined a small probably wouldn't yield an appropriate fit. It is bulky so if you are a "big" man width-wise, this is for you. Return was handled well. I got an Eddie Bauer medium and it fit like a glove. It is well made though & would keep you warm.