After Using my Stand Up Paddleboard (SUP) for 3 hours in 6,5mm neoprene shoes with temperatures about 0, my feet felt almost numb, although they were dry. I've got problems putting my trousers, I needed to roll them over my feet by hand. After they get warm, they were perfectly OK, but it was not a nice feeling.
I've heard about people walking barefoot on snow, which is definitely much worse. Is it possible to make my feet more cold-resistant? Is this a matter of practice? Or maybe it's because when on SUP, my feet stay in the same position for the long time?