Years ago, I was told of a tip that really works. I was doing outdoor work with snow and ice all around. The ground itself was frozen solid. My feet got so cold by lunch, they hurt.
A carpenter on the job told me to put on thick, good-quality cotton socks, put a plastic bag over each foot, and then a pair of wool or other thick socks. Large shoes are a must.
I gotta admit, it works. By the end of the day, my feet and the inner socks were a little damp, but not even the slightest bit cold. I bough the carpenter lunch all that week.