When the weather gets cold, Ordinary thermal socks or wearing many pairs of socks will often let you down. To be confident in the cold you need a sock with high insulation.HEATED Socks have been tested to achieve a thermal tog rating of 2.13, and will keep your feet warmer to minus -25C or -13F ensuring your feet stay warmer for longer. Holds warm air close to skin 7X Warmer than basic socks WHY THESE SOCKS ARE SO WARM: The specially developed advanced fibers provide high performance insulation against cold with superior moisture wicking abilities. The innovative long looped thermal pile knitting technology products a unique, extra-long looped cushion pile to hold in more warm air, increasing the thermal TOG rating. Using an intense brushing process produces a soft brushed inner fabric that maximizes the amount of warm air held inside the socks for all-day warmth and comfort