Tried out two sizes, large and extra large. I'm 6'1", with a slim, athletic build, and the x-large was closer to a good fit. Large was too small (tighter on the chest, and too short). The x-large is a little short on me. Arms could be a liiiittle longer, and smaller, but that's probably thanks to my noodle arms. Overall a nice shirt for the average build, but taller folks may need to look elsewhere.