Trytaping a warmer over each kidney to the outside of your tee shirt, along with the antiperperant on your feet. It really works better than putting them in your boots. I learned thattrick on this boarda couple years ago. I usually have a hard time keeping my toes comfy in 30 deg. temps for very long, but I was ok for4 hours sitting at the base of a tree a couple years ago in a late season windchill of below -40.