Really cool jacket for mild weather. Isn't fleece lined or anything like that and if it's pretty cold out, you'd want another jacket on top of it, but for mild days it's awesome.
For those curious about fit, I'm 5,10' and lean (little bit of upper body muscle) and the small is a really good, snug fit. If you're the same height, but a tad chubby, go up to the medium or you'll look like the Michelin Man.
Only criticism is the extra high collar, if worn up you'll look like you've been kicked off the set of Jersey Shore, and if down.... it looks less rad. But it's not enough to matter.