After ordering two other brands of electric socks in the past year, both of which had to be returned, these Madetec socks are a winner.The fabric blend does a great job of cushioning my feet and keeping them from sweating, which has been an issue with all other electric socks, usually made of cotton. They also are quite warm on their own, as I have sometimes never needed to turn on the electric heaters.The heating wires are very small, but can be felt if they run across a foot bone while in a tight ski boot. The good news is that it's pretty easy to twist the sock a little to keep wires off of the foot bones.The batteries are strong for at least six hours in 20 degree weather and on the middle setting. However, the little blue LED lights are very difficult to see when outside on a bright sunny day.My biggest complaint is the extremely small battery securing button and very small button hole in the sock. My fingers are simply too big to manipulate the button in and out of the button hole, so my wife does them for me, though difficult even for her.These socks work great and after wearing them 8-10 times now, they are winners on all fronts, except buttons.I used these socks for ice fishing on the Medium setting and the batteries went dead after about 2 hrs. It was only 22 degrees and I could just barely feel the heat. If it was really cold and put on high they wouldn’t last but 30 min.They do seem to be of decent quality and the wires aren’t big or bulky. Runs true to size.My daughter is wheelchair bound and keeping her feet warm is difficult. These socks have been a lifesaver. On the medium/middle setting they last most of the day - when she is in bed we try to recharge but they last most of her wheelchair time. We don’t worry anymore about her feet getting chilled. I wished I had bought these sooner. I need extra batteries and that will solve how many hours we can keep her comfortable.These are excellent to keep your feet warm in the winter. I usually use them on low and they last for 7+ hours. Comes with a small mesh bag to safely wash them in on gentle cycle.seems to work fine, toes stayed warmThe charger cord in sock broke off only wore the socks maybe 10 hours and they brokeDidn't meety need so returned them.I purchased this product over others due to the product picture making it appear that it would heat all of your foot & possibly calf. Unfortunately this couldn't be farther from the truth. There are only wires sewen in to the light grey squiggly lines at toes. This was a major disappointment since I really wanted them for sleeping at night when we tent camp; I wanted more than just toe warmth!