Description of Outdoor Research Reva Full-Zip Sweater - Women's:
Alpin-wool adds natural warmth to the Outdoor Research Women's Reva Full-Zip Sweater while the wicking polyester interior feels soft next to your skin. An internal storm flap behind the zipper helps block cold air, and stretch binding on the hem, cuffs, and collar seals in the heat without cutting off your circulation. Stash your house key in the small sleeve pocket when you’re out on a fall or winter hike.
I like the sweater, but it's really short in the body - I don't know why XS sizing always assume you have a really short torso and arms, but this one is guilty too. I got the backcountry.com brand wool siphon hoody instead - and it's much longer in the torso (and a fantastic deal right now!).
I have a couple of these and they are great for both camping and traveling. I usually wear smalls, but I got this in medium so that I could put another layer under it if I wanted to. It's still really form fitting even with the Medium, so it doesn't look like it's floating on me at all. These shirts pack up small, feel great, and keep me warm!