I went south on the Jordan River Parkway instead of the South Jordan rec center, even though there was haze in the valley. The temperature when I left home was 31 (F). I wore an extra layer (4 layers) and felt warm, except for my hands. I wore a pair of cotton gloves, but they didn't keep my hands warm. I need about 2 miles to warm my core and then my hands, and I'm not going that far. The next time I run/walk when the temperature is around or below freezing, I'll use a different pair of gloves.
The runner in the following picture, taken from the web, is doing a heel strike in front of his knee. Hope he doesn't get shin splints :).