I'm a little old school and still use my old stuff, Heavy Polartec, followed by real wool, covered with Cabela's bibs, my carhardt HD sweatshirt, then Cabelas parka. Accompanied by baseball gloves, wool mittens, hand warmer in hand muff, a head sock, Ice Man Pack boots, and toe warmers.
Good info Shoulderblade. Thanks. I still believe my biggest issue in extreme cold hunts for an extended time period will be my feet. Hands with a hand warmer in a hand muff around my waist has always seemed sufficient. The feet I may have to tackle next year.