I had been looking for a really good windproof fleece for about six months before I finally decided on the Patagonia. Accordingly you can probably figure from this that I'm pretty thorough with my research and require good value for my money. Everything I've ever bought from Patagonia has performed as promised and lasted for many years and this jacket is proving to be no exception to that legacy of excellence. It is warm to a fault, I really like the look and form-fitting styling, and it really *is* windproof. I wore it for a walk on the beach (northern CA beaches are quite windy) and what could have been a cuts-like-a-knife wind, barely touched me. The only thing that kept me from rating this a 5 is the fact that the arms are cut a bit too close (precluding any significant layering under this jacket) and the jacket is a bit tight under the arms. However, it has been stretching a bit as I wear it and I'm sure it will eventually feel just fine. For a lightweight layer under a rainshell, or on its own, this jacket is fantastic and performs as promised.