A couple of buddies at deer camp have tried Thermacell rechargable electric heated insole with remote this year and really liked them. Thinking of givin'em a try next season.
I've had several pairs - they work for long sits in the cold, and light duty walking in. IME, the insoles are good for about two seasons before they lose enough charge to need replaced.
IMHO - spend the money and get the variable heat output, they keep my feet warm without as much overheating aka sweating in your boots.
