Not quite what you are looking for but why not a pair of mucks.
BUT I got the boots in my normal size and they arent big enough to wear good thick socks with though (my mistake i was going for a tight fit for walking, not thinking about room for insulation). I can only get a liner sock on and still have enough room for my feet to breath..
brian
Fair enough I use to wear rubber boots while looking for the boots that would keep your feet warm no matter what. I have now switched to a leather boot with like 400 grams of insulation and with a good merino wool sock I am good and I have also invested in a pair of boot blankets or whatever they are called from cabelas. When my feet get cold I am done.