I have 4 pair of boots. They go by temp. Uninsulated rubber slip ons, 50 degrees and up. Wolverine goretex, 800 gr thin., 35 degree and up (my favorite, light like tennis shoes). Rocky Blizzard Stalkers, 1200 gr thin., 20 to 35 degrees. Lacrosse Icemans, pac boots, 20 degrees or less. Cold feet have been my biggest problem since I started hunting. Left foot gets cold first. Must have poor circulation in my feet. This system works for me. I can get 2 hours in the coldest conditions without feet warmers.