This year I used feet warmers, like hand warmers but made for boots. Some for toes some insoles. I always thought I was cheating. We use them alot at work with safety toes.
Also I bough new pair of Icemans, I may try them next year, for sitting. Though maybe I am getting old, or they are not as good, but they don't seem as warm as I rememer.
Thought about bunny boots too.