Running in cold weather with cotton fruit of loom sweatpants does not work. The wind blows through and its not that insulating. Running in down jacket can be bad too because perspiration condenses on inside of jacket. Then the wind hits and makes you even colder. I hope the under armor cold gear helps because it's supposed to be insulating and also allows perspiration to evaporate. I didn't talk to anyone about what to wear for cold weather jogging. So I am just trying to figure our what works. I learned that 6k is 3.7 miles. So that is 0.6miles more than 5k. I have to be ready for longer race in cold weather. I tried drinking water that I leave in car but it was so hard to drink because it got too cold. Almost frozen.