Heat Holders Thermal Socks Men's Original Red 7-12 us 100% Acrylic Keep feet warm on the coldest of days and pull on this pair of Heat Holders, the ultimate thermal sock! Thick, chunky and soft, Heat Holders are made from a heavy bulk yarn with extreme thermal qualities which is also increased with it's unique extra long terry cushioning. This exceptional terry cushioning also supports the foot and gives all over comfort. Slipping into this bulky sock you will feel the super soft intensively brushed inside that not only feels great against the skin but also traps warm air close to the foot and leg keeping your feet warmer for longer, helping to give this thermal sock a Tog rating of 2.34.