Heat Holders - Mens Knee High Thermal Slipper Socks Heat Holders understand that their original length Heat Holders weren’t keeping your knees warm. These long socks have the same warmth and comfort as the original Heat Holders Slipper sock, but in a knee high length, plus non-slip grippers on the bottom to provide better traction on indoor wood or tiled surfaces. Our expert Heat Holders Brushing process maximises 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 The Tog rating of this sock being 2.34 whilst a basic cotton sock only measures at 0.33 Tog. Thick, chunky and with a massive tog rating, Heat Holders are made from a specially developed heavy bulk yarn which has extreme thermal qualities. The Extra Long Slipper Socks are available in Black and are One Size 6-11 UK. They are made from 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane and are Machine Washable. Extra Product Details Men’s Heat Holders Long Slipper Socks - Knee High Length - 2.34 Tog Rating - 7X Warmer Than A Cotton Sock - Special Thermal Yarn - Anti-Slip Grippers - Soft Brushed Inner - Thick and Warm Fibres - Great For Indoors - Available In Black - Men’s One Size: 6-11 UK - Machine Washable