2.3 Tog Rated High Density Extra Thick Advanced Insulating Yarn - Our specially developed advanced fibers provide high performance insulation against cold with superior moisture wicking abilities. Long Looped Thermal Pile - Innovative knitting technology produces our unique, extra long looped pile to hold in more warm air, increasing the thermal tog rating! Soft Brushed Inner - Finally, an intense brushing process maximizes the amount of warm air held inside the sock for all-day warmth and comfort. Size- UK Women's 4-7 and UK Mens 6-11