[Dozer523]

If you are cheap like me (spare me the obvious come back) take the pair of Army issue socks and turn them insisd out and put them on. Now you have the smooth, comfortable side against your skin. Now take another pair of the same issue army socks and put them on without turning the inside out (Inside- in or Outside-out). Now you have the fuzzy parts together between the two socks and this gives you more insulating airspace and it wicks moisture away.
Or if you can find them buy the 100% wool thick yellow one in the PX. Turn those inside-out but only wear one pair. Just be sure to wash in cold and NEVER put in the dryer. You have to keep your boots loose (but not so you slide around in them). And you have to keep your boots dry, wet boots; nothing you can do in the cold. Your feet need to come out of the boots at least once per day and get a good airing and a dry and a massage (mention that you really love them alot -- they like that!)