I have an Icelandic wool sweater and this is warmer, thinner, and lighter than it. Easier to get on and off since it has a full zipper. The zipper also allows you to regulate your own body temperature and zippered pockets allow you to securely store important stuff that you don't want to loose, like the car keys.

  Not sure why they call it a jacket since wind or rain passes right through it, but now its become my favorite sweater for New Jersey winters.