I picked up a similar product while in Duluth about five years ago, but I don't think they make it anymore. It's supposed to be a windbreaker with a thin fleece like lining, zippered vents under the arms. I normally wear it as a light weight jacket off the bike. With just a few layers, as long as the wind was not blowing I was good to about ten below. Down by Lake Superior two years ago I cried uncle and got a winter jacket with a hood. My only nit-pik, I'd prefer a cotton cuff like on my old leather jacket to the taped edging they use.
In use, I tend to prefer jacket styles vs. pull overs. Next time I'm in the Aerostich I'll have to check out this new one.