The original, ultimate thermal socks, but with a twist - Mens 1 Pair SOCKSHOP Heat Holders 2.3 TOG Patterned and Plain Thermal Socks have been scientifically tested and certified to achieve their superb 2.3 TOG rating. They do this by using specially developed thermal yarn, woven with an extra long looped pile, which is then intensively brushed to create a soft dense inner layer that holds in the heat in its fibres. are still every bit as warm and comfortable, but now with the addition an attractive two-tone marl yarn. Giving the colours a fresh dimension. Everyone can benefit from the Heat Holders difference too, because their comfortable leg design avoids the restriction and pressure that can hinder circulation for some wearers of inferior socks.