ok
cover up your feet. this means ditch any shoes with
vents. or tape up the vents.
the key with warm feet in winter are shoes a euro size or 2 bigger than
you normally wear, so you can do the following
wear a wool sock, or two
use a strip of scotch tape and tape a handwarmer
on top of your toes. don't need much tape, just enough
so you can slide your foot in the shoe and the warmer
stays put. that will be good for 5 hours.
if your shoes are too small you will have a real hard time keeping warm.
the next best thing is a handwarmer on the outside of your shoe, over
the toe box, and a full bootie on top.