I ordered a Men's Medium collared dri-fit. I would say it is on the small side. Perhaps one could say it has a more "athletic" fit. It is plenty long enough, but the shoulders and hips were a little narrow when compared to a cotton Hanes shirt. It is stretchy, so it fits. However, "we" don't like dry fits to be too fitted as they tend to show unwanted details.
FYI, it is a great looking shirt!