After 40 years of hunting in northern Wisconsin's cold, I think I've finally found the perfect way to keep my feet warm when spending hours on a stand. It's a pair of insoles called the "Heat Factory" that I bought at Wallyworld for $6. They have a "pocket" in the toe area that accepts disposable foot warmers. The insoles come with a hard rubber, yellow colored "filler" that you use when you don't need the warmers. When the warmers are in the insoles, they fit so well that you don't know they're in there (except for the warmth they generate). I've tried putting toe warmers in my boots before, and though they did keep my feet warm, it was very uncomfortable to walk any distance with them in there. Now with the insoles especially designed to hold them, you don't even feel their presence, so you don't wind up with warm, but very sore, feet at the end of the day. They work so well, that I've traded my big heavy LaCrosse Iceman pac-boots for a pair of lightweight waterproof Rockies that only have 400 grams of thinsulate. At the end of a day of hunting, my feet and legs would get very tired from lugging around those big boots, but now I can walk for miles without my legs and feet getting tired. I've bought a lot of "gadgets" for hunting over the years, but this is absolutely the best $6 I've ever spent.