Here is what works for me. I start with a quality boot with either 1000 or 1200 grams of thinsulate. Then I spray anti-perspirant on my feet. I use either one pair of 100% wool socks or a pair of polypropolyne socks with a pair of wool socks over them. Never put cotton on your feet, or anywhere else if you hunting extreme cold. The anti-perspirant will keep your feet from sweating, the poly propolyene will wick the moisture away if there is any and the wool will keep them warm weather they sweat or not. My feet use to FREEZE and I bought expensive pack boots and socks etc. etc. and they still froze until I started doing this.