I'm 6ft 1in and my weight fluctuates between 180 and 190 pounds depending on how much I'm walking/lifting/eating at any given time. I have this shirt in both a medium and large size and unfortunately I'm in the middle of those two sizes. The medium fits perfectly when I'm at the bottom of my weight range but still protrudes past the pant line when my arms go over my head, when I'm at the top of my weight range it's a little too tight. The large fits well, the case is a little more than I would like. It's not the kit's fault though, which is absolutely gorgeous. Dries quickly, does not smell, stretches well. Very comfortable, absolutely no problems either with the design or with the material. Much cheaper than the ones from Patagonia or the North Face, be sure to get yourself a few!