So it has been a struggle to keep warm while hunting. It is a challenge to sit still when your toes get so cold they hurt and soon after you can't even feel them.
Tomorrow I'm trying chemical warmers to see how they do. (Toe Warmers)
Follow-up: The toe warmers work very well. They were worth every penny. Shortly after I found an even better option though: Lil' buddy heater. This little guy is awesome. Also, it is approved for use indoors and will be much safer than the propane heater that I was using. The full radiant propane heater that I was using was a bit too loud for hunting. It emitted a constant hiss that was fairly loud in the still of the morning.