Heat Holders® are the warmest socks ever! They are over 7x warmer than regular cotton socks and nearly 3x warmer than ordinary thermal socks. They are better than heated, electric or battery operated socks because you can just put them on without fussing with batteries, wires etc. Heat Holders® means No more cold feet! They are made using a unique 3 step process which makes them the Warmest Thermal Socks™!