I tried those heated insoles this year from therma cell. They where spendy, but tried everything else over 40 years, and believe its like back pain, willing to do anything to get it to go away..
Out hunting season was mild of course this year, but not once did I suffer from cold feet. I like the wireless remote feature a lot, and now they have removable batteries rather than just charging the insole. the litmus lasted long, I just cycled them as needed. I slipped them in 400 gram danners, and never looked back. Feet didn't sweat, the insoles where a tad tighter than the danners OEM's. Looking forward to using them walleye fishing, the aluminum boat transfers the cold easily. I put a close cell foam pad on the base off all my climbers, to reduce the cold transfer for contact points. Same goes for the climber frame, using pipe close cell insulation with hockey stick tape. It also keeps errant sounds to a minimum, particularly loose stuff, thermos, scope caps, and things like that, doesn't add a lot of weight. I also put a rear pick up truck rack on the climber frame, cutting off the upper gun holder, sheet screwed it down, right at knee height below the 45 degree piece near the front tie in, so I can stick my rifle in the gun holder when I am posted. Worked out well and cheap, they are rubber dipped, so its quiet.