Layers are key. Wear two pairs of socks. Best to have a thin sock under a thick warm sock. And wear a hat, even inside, even to bed.

Oh, if your feet get sweaty and make your socks damp, put on new socks. You want your feet as warm and dry as possible. I carry extra pairs of socks in my car, backpack, etc.

Layers are key. Wear two pairs of socks. Best to have a thin sock under a thick warm sock. And wear a hat, even inside, even to bed.