The Charlotte Marathon was ran yesterday (November 12th) and as the photo shows it was cold. These two runners stayed warm with tin foil wrap. Actually this is a thing now and I assume you can buy these sheets in any running shop. I understand they are light weight and do a good job of blocking the wind.
This photo was taken at the intersection of South Tryon and Martin Luther King Jr. Blvd. For those who want to run next year; following is the Facebook page for the Charlotte Marathon.
Charlotte Daily Photo 
I’ve seen them do it with marathon runs here, those covers, even in warm weather.