I have diagnosed Reynaud’s Syndrome which has caused a severe narrowing of blood vessels in my extremities. As I type this sitting at my desk, my hands are cold to the touch and take 8-10 seconds for color to return after pressing on my hand. This makes cold hands and feet 10x worse and more prevalent.
Regarding my feet, I’ve found the easiest thing to do is to wear a pair of socks out, and then change to a pair of warm dry ones once I find a place to set up if my feet were sweating. On a day where I know I am going to be more mobile, I may take 3-4 pairs with. My situation is not ideal, but every sock in the world has yet to help with this on its own for an entire day.