Octave Mens Black Supreme Thermal Socks - Extra Thick Bulk Yarn 2.2 TOG Rating 3% polyester 91% Acrylic, 5% Nylon, 3% Polyester, 1% Elastane The HeatGuard sock is your essential winter sock providing 4 times more heat insulation than your average cotton sock. With its unique construction and specifically developed fibres, the warm air is kept close to your skin. HeatGuard socks have been put under intense thermal testing to achieve an outstanding average TOG rating of 2.2. With the excellent thermal qualities of HeatGuard, the temperature of your feet can stay high while the temperature outside falls. KEEP YOUR FEET WARMER FOR LONGER: Specially developed fibres have been selected to form an extra heavy bulk yarn. Deep cushioning helps to keep more heat inside the sock. The inside of each sock has been brushed; this keeps the feet warmer for longer. No need to wear several pairs of socks anymore, one pair will always keep your feet warm. UK Sizes 7-11