My feet get cold only b/c of being wet from sweat. So for me more insulation was not the key but rather more effective components. How I hunt it often means a good hike in before sitting down, so if I am staying for a while I pack in my sitting boots with a change of dry socks upon arrival. For this I dry my feet off with a dish towel, then polyproplene sock liner, then merino(or wigwams) wool socks and some good quality waterproof w 800 gram thin. boots with the laces loose. If I plan on hoofing it a lot the only thing I change is wear 600 gram thin. boots the entire day. I also found a product called "No Stink" it is a paste you rub on your feet to help prevent sweating. You apply it daily for the first 3 days, then once a week to follow and it works! It is made in canada but I am sure their are other similar to it state side. Wiggle room is also very important, as is keep your head and lower back warm. I like the heat packs for my fingers as well.

Up here it can be down right cold and this is the only thing that has helped tomake it comfortable for me.

Money spent ongood qualitywool socks is well worth it...the regular wooly's you buy at wally world don't even compare.

(BTW - Stay away from any sock that uses cotton, it is a killer!!!!!!!!!!!)