It’s been in the low to mid-40s when I ride to work this morning. I’ve been wearing a jersey, light-weight thermal top, and a light windbreaker jacket or vest. This kept me warm, but I could still feel the wind go through all my layers. Yesterday, I wore a jersey, arm warmers and a vest with Gore Windstopper on the front. Although the Gore Windstopper is little heavier than a light plastic shell, it did a much better job of keeping the biting cold away from my core.