I have long arms that appear skinny from the front, and most standard fit T-shirts only seem to exacerbate this thinness. But the Nano-T shirt short sleeves make my arms look more normal, even a little muscular, which I like.
I have only one issue, even though I love this style shirt and will definetely buy more, and that is that the stitching around the neck is very weak. The shirt is a great fit, but when new fits just a tiny bit tight around the front neckline. So I give it just a slight tug to just slightly loosen it, and I hear the stitching snap. After one to two days wear a hole forms at the neckline, and this has happened with a few of my Nano-T shirts. But I hand stitched them with the same color thread and now they look fine. I like everything else about the shirt, just that I believe this one issue needs to be addressed. I give this shirt 5 stars, but Fair for quality due to this neckline stitching issue.