I've made my own and used them for hunting on into the winter in northern WI and MN. If you get wet, stuff dry grass in the bottom. An insole cut from a tanned sheepskin works well. If your moving your feet stay warm. I made a pair of beaver fur mittens with gauntlets that came halfway up my arm and if I decided to sit somewhere to watch a trail I'd take the mittens off and slide my feet into the gauntlet part, toes stayed toasty.
