I bought the Hot Sox for my boyfriend for Christmas because he has complained every night about cold feet. I had thought that socks with warming function something great for him and would have looked just once, if there is something. Here I found the Hot Sox. I have not even tried, but he's excited! He uses it almost every night. Hold long enough hot ... at least it was never necessary to do it a second time in the microwave. To run it are obviously not intended, nor suitable. A few steps up to the bathroom and back are still possible. He says it is like on sand. I have read in some reviews that the shoes are wet or smell unpleasant. With moisture we previously had no problems. The linseed smell a little of damp grass ... but only if you put your nose into the shoes. If, as provided the shoes does not pull on your face, but on your feet, you can smell nothing. I also read that some problems have so that the entire sole is made of only one chamber and slide the flaxseed either the heel or the toe and the foot is warmed unevenly. I told my friend, however, offered to make another seam which divides the sole into two chambers. He refused and said that if you shake a bit, the linseed also distribute evenly again. So all in all a great success and all doubts have vanished into thin air. For the price you can not complain really !!!