I skipped the wind blocker last week. It felt great, except I got cold feet with temps in the high forties. With non-ventillated winterer cycling shoes and wool socks. I am wondering if peripheral vaso-constriction was to blame due to the extra heat loss from the upper body. I was considering buying a vest, and seeing what combo of head and upper body cover worked as the temps declined. However, it is more likely that the temps will move solidly into jacket territory before I get it figured out.