NWT. Women’s size 5-9 Keep feet warm on the coldest of days and pull on this pair of Heat Holders for women, the ultimate 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 that not only feels sensationally soft but also traps warm air close to the skin keeping your feet warmer for longer. If you've been trying to find that one pair of socks that will keep your feet warm in the harshest of conditions, then Heat Holders will certainly be your answer.