I gotta admit I love these socks.  I love wearing them so much I truly hate to see warm weather come around.  I have not just hiked in extreme conditions in these babies, but I also do a lot of walking in winter along the coast here.  And I very seldom cancel a walk no matter how cold it is.  These socks not only keep my feet toasty warm, but they also are so comfortable they are kind to the feet as well in just offering support.  I wear them all the time both on cold nights around the house as well as for walking and hiking.  Some of the pairs I own have been around for more than three years and they are still in great shape and looking good.  I've been a winter hiker for more than a dozen years and personally I don't think they come any better.  About the only thing I would suggest if you are considering these socks is that you order them one size up than your actual foot if you are near the top of scale. For example if you're a size 10, move up to the 11 and up fitting.  As they progress in size they don't really get fatter but just longer, and I really enjoy the extra room and longer length.  I think you will too.  Really great socks that are well worth the price and as warm and comfy as they come... : )