Review on Stay Warm This Winter With Rechargeable Electric Socks: Unisex Battery Powered Insulated Heat Kit For Skiing, Biking, And Hunting by Kyle Miller

These socks were not used much as my wife felt they did not heat her feet sufficiently. I had to do some outdoor work at freezing temperatures for several days. The socks did keep my feet from freezing but not warm. Yesterday I noticed one sock felt cooler on the heating element when I took the sock off. The battery still had charge. Today after work, the sock element was cold. Avoid this.