I have two of these vests, and I love them. They're perfect for indoors over a cotton turtleneck and outdoors under a lighter winter jacket. In each case, they provide exactly the right amount of warmth. The cut is great and the fit perfect. I chose medium (sometimes I order similar items in large, but no need to this time) and find it very comfortable.
I purchased these vests for my daughters for Christmas and then bought one for myself; they had never owned a vest, but absolutely love theirs after wearing them....warm but not bulky; great for driving the girls to school in the morning and for shopping at the mall. As I live in Wyoming, I wear a vest practically year round....the super 200 fleece is warm but not bulky, the adjustable drawstring at the bottom can be drawn up to keep out the wind or let out when not so chilly. This is certainly one of the smartest purchases I have made....love it, love it, love it!!!
Love the vest - exactly as others explained in their reviews. Fits great - I got the small from reading other reviews (even though I have broad shoulders and sometimes where a medium t-shirt) and it fits perfect! Collar does not stay down well but not a factor for me. Will use it for bike riding and paddling on the bay in an outrigger canoe (Calif coast).