These socks are available in a size 4-8 UK and in 6 colours. They are also available in a knee-high version. Wool Rich - Combined natural heat retaining and wicking properties of wool, with the knitting that makes Heat Holders so warm. Long Looped Pile - The Innovative knitting technology produces a unique, extra long looped cushion pile to hold in more warm air, increasing the Tog rating. 2.7 TOG - These socks have a tog rating of 2.7 TOG, making them over 8X warmer than basic cotton socks. Soft Brushed Inner - Finally, the expert brushing process maximises the amount of warm air held inside each sock for all-day warmth and comfort.