I rode into the university today to drop off my laptop. I brought my GoPro camera and the mount that I built to get rear facing video.

-20C with a 25km/h headwind in the morning. The video is a graphic example of why its good to wear breathable clothing. Throughout the ride escaping water vapour forms a frost on the front and rear of my wool sweater. Wearing a less permeable material would mean all that moisture would be trapped inside.

-15C with a 15km/h tailwind meant I could drop a layer and didn't even need my goggles.