Goggles are a great idea. Definitely use layers. By "hand warmers" I assume you mean those things you shake and then put them in your mittens. Definitely use those.
If you use wool socks, they will keep your feet warm even if they are wet. In fact, wool coats all around.
There are herbs for this sort of thing if you want to go that route. Eat food that is super spicy. This will keep you warm internally. Also, get some cayenne. 90 HU is the hottest. Put this on the outside of your inner pair of socks and mittens.
Try to stay out of the wind. Wind will carry the cold deep into your body.
Also, use essential oils. Cinnamon is the hottest. Ginger is good too. Black Pepper is good, but it is a middle note, so it will only last about 4 hours. Put the oils on Du 4, which is on the spine, opposite the navel. Also, Ren 6, just below the naval. Spleen 6 and Stomach 36 are good too.
Point Locations.
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