This is Gap's Rolled Henley Sweater (style #635778), which retailed for $39.50. It was alpha-sized, and was available in a number of different colors, a couple of brights and some neutrals. I tried this on in a small, and found that it fits true-to-size, maybe even a bit large, depending on how you would want to wear it. If you're looking for a more fitted look and are on the smaller end of your size, you could consider sizing down in this sweater. If you want a looser, more casual look, then I'd start with your regular size and size down if necessary.
The sweater is made out of 100% cotton, and is a nice, soft knit. It's a nice, breathable fabric for a spring and summer sweater. The sweater itself is lightweight, and it is on the sheer side, at least in this color.
I liked this sweater, but left it behind. I wasn't crazy about it, although I will say that it was super comfortable on.