I suffered with cold feet for years before I finally broke down and bought a new pair of boots designed specifically for cold temperatures. Its the smartest decision I ever made. There are hundreds of kinds out there, but I selected a pair made by Baffin. I think they are called Trapper boots. Buy boots that over-rated for the temps you expect. In other words, if you expect to sit in temps of 0-20 degrees, buy boots rated to minus 20 degrees. You cant stop your feet from sweating when you hike, but you CAN stop the cold from ever getting to them with these kind of boots...I only have to one pair of socks!! Mine were under $150 and WORTH EVERY PENNY. I only wear them when the temps are going to justify it, so they will last for years and years.