Ladies Heat Machine 2.30 tog rating the ultimate thermal socks single pair presentation pack, the ultimate thermal Heat Machine socks combat the age old problem of cold feet with their unique 3 stage insulation process. A high tog rating is achieved by holding as much warm air in the fabric as possible, due to Heat Machine specially developed construction and our intense brushing process, Heat Machine trap much more warm air close to the skin compared with a normal thermal sock. We achieve a high rating of 2.30 tog and thats over seven times warmer than a typical cotton socks. Whether pursuing outdoor activities, working within a cold climate, health issues or simply for that extra comfort throughout the cold winter months Heat Machine will help ensure NO MORE COLD FEET! Size: UK 4/8, Eu 37/41 Fabric: 91% acrylic, 5% nylon, 3% polyester, 1% elastine Please note these are sent as a parcel not large letter.