you want some waterproofed shoes, not to keep your feet warm but to keep the moisture out & some nice thick woolly socks
The Warmest Socks Guaranteed to Conquer Frostbite - Cool of the Wild
Sympatex ? Footwear ? City
the sympatex material's what all the forces use & those socks have battery powered warming units
Good luck with that cold weather, brrrrrr too cold for me!