I do the handwarmer in the boot too. Its been two seasons hear in NY that we haven't had cold weather. Its got to get below 20F to be considered cold. The sitting in the cold dosen't bother me so much. Its the get up and trying to get moving that is hard. I swear the hardest thing to do hunting is to unhook the bow or gun from the "let down" line of a treestand after sitting for 4 hours and hardly moving. That or trying to unzip and zip your fly after hardly moving for 4 hours.