After some trial and error, the pad works like a charm for my consistently cold feet. A few things to keep in mind though:1) there is only an on/off switch, so you'll have to turn it off once it gets too hot.2) can't put it on carpeting which is a pain, but I used the cardboard box it came in to place under the mat.3) wearing socks seems to help with spreading the warmth to the top of the feet as well.4) wipe it down before use, there's this slick, oily residue on both sides of the mat.