I live in Tahoe and regularly take my dog to a local dog park, so I'm in the elements for about 2 hours at a time. Before my Bogs, my feet were FREEZING, even with thermal socks, wool socks and a thinner sock-I just could not get warm! Now, I wear one pair of thick socks (they run about 1/2 size large, I think) and I have been perfectly comfortable ever since I purchased them. Hurrah!!!!NO MORE COLD TOES!!!