Not my favorite, stick to Icebreaker or Ibex instead
I ordered this shirt for running, b/c I have some problems with Icebreaker running specific tees (although I really love their superfine lite tees). The smartwool is a bit of disappointment. The bottom hem is curved, but it's just a tad short for me and I'm only 5'6". The fabric feels somewhat coarse - I have loads of Icebreaker and Ibex and have never had a problem w/ wool. Finally, the fabric also feels somewhat heavier than the Icebreaker Tech T Lite, which makes a difference for running in hot weather (although it's hard to measure). I think this tee works and obviously will perform just like any other merino clothing, but just not as good as alternatives. Fit-wise, other than length, sizing is right on when I ordered my usual size.