Men's Original socks 3-Pack in BlackThick, chunky and with a massive tog rating of 2. 34, Heat Holders are made from a specially developed heavy bulk yarn, these socks are 7X warmer than a regular cotton sock. With long pile cushioning, these thermal socks will help keep feet fully comfortable and supported. The inside of each sock has been intensively brushed such that they not only feel sensationally soft but also trap warm air close to the skin keeping your feet warmer for longer.