Originally Posted by
badrad
I found that same experience having worn thicker socks but having colder feet. During the cold weather rain I have gotten used to wearing overshoes/gaiters instead of thicker socks, and found that my feet were much warmer, in part as you mention that the feet were not constricted, and the overshoes provided an extra layer of insulation around the shoe.
My experience is the same. I have loose(ish) shoe covers which I wear in the rain. When the temps drop below zero Fahrenheit, I wear them over my normal shoes and socks.
Keeping the core warm also helps the extremities by providing plenty of warm blood to the "radiators".