It's really soft, with just the right amount of stretch, and it's fitted, but not overly tight. Here in SC, I rarely ever need more than one layer, and this shirt is thin, but warm. It would be a great base layer if you live somewhere where that kind of thing is necessary. (I'm sorry.) I got the gray, and I definitely want some more colors.
*PS - This isn't a sponsored post. I bought this shirt with my own money. I love it, so now I'm telling you about it. That is all.