Heat Holders Wellington Boot Socks These socks have the same warmth as the original Heat Holders® sock but in an extra long leg length plus elasticated foot & ankle support. These work really well with rubber boots and great for spending time outdoors during the cold winter months. Having the warmth of our original socks and the length of our extra long socks these have the added bonus of a turn over top made of super warm and soft fleece material to keep you warm and add some style to your wellingtons! What makes Heat Holders so warm? Our Specially developed thermal yarn provides high performance insulation against cold with superior moisture breathing abilities. Innovative knitting technology produces our unique extra long looped cushion pile to hold in more warm air increasing the TOG rating. Heat Holders are Scientifically tested to be over 7x warmer than a basic cotton sock! Heat Holders Tog rating being 2.34 whilst a basic cotton sock only measures at 0.33 Tog. Finally our expert brushing process maximises the amount of warm air held inside each sock for total warmth and all day comfort.