Here's a lifehack my dad taught me. If you have cold feet and no way to warm them - stuff some newspaper (or any kind of paper really) in your boots or socks. Most of the cold comes from moisture and paper is incredibly good at sucking it all up. The difference is huge and instant .
I feel like this trick has saved me from catching a cold on quite a few occassions.
This advice was also given to me if I ever get caught in the rain while camping and soak my shoes. Bring some newspaper for both a firestarter and for leaving in your shoes overnight, and wake up to dry shoes!
Old-school winter hacks tend to be simple physics, not magic
If they turned out to be magic I'd be more surprised