Heat Holders - Men's EXTRA LONG Ultimate Thermal Socks, One size 7-12 us 91% Acrylic 5% Nylon 3% Polyester 1% Elastane machine wash Heat Holders Yarn - Heat Holders' Specially developed thermal yarn provides high performance insulation against cold with superior moisture breathing abilities. Heat Holders Loops - Innovative knitting Technology produces our unique, extra long looped cushion pile to hold in more warm air, increasing the TOG rating. Heat Holders Brushing - Finally, our expert brushing process maximizes the amount of warm air held inside each sock for total warmth and all day comfort. 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. Heat Holders - Best seller since 2010, providing a wide range of winter thermal products that we provide in the sock snob online amazon store