Keep feet warm on the coldest of days and pull on this pair of Heat Holders, the warmest thermal sock! Thick, chunky and with a massive TOG rating of 2.34, Heat Holders are made from a specially developed heavy bulk yarn which has extreme thermal qualities. With long pile cushioning, these thermal socks will help keep feet fully comfortable and supported. The inside of each sock has been intensively brushed so they not only feel sensationally soft but they also trap warm air close to the skin, keeping your feet warmer for longer.