Dependable Industries Brings you a thermal warmth heated sock. With thick cushioning and high bulk yarn, our socks will keep your feet warm in extreme cold weather. The socks special acrylic yarn gives high thermal capacity. The special knitting method creates a much thicker cushion which increases heat retention and adds comfort. The Tog rating on these socks is a 2.3 which help keep your feet warmer to -30 degrees Celsius which is -22 Fahrenheit. Our socks will keep you warmer longer then ordinary thermal socks.