Keeping your feet dry in the #1 priority if you want to keep them warm. I have a pair of Rocky SnowStalkers with 1200grm Thinsulate. These combined with two pairs of wool socks keep my feet toasty. But there is something that I started doing a couple years ago that really, really helps. Get some ScentKiller deoderant roll on kind. Roll it all over your feet before you go out. Its an anti-persperant and keeps your feet from sweating. Not only that it helps keep foot oder down as well.