The original British designed Octave Extra Warm Thermal Sock has been engineered to provide 8 x the warmth of regular socks. The combination of insulating yarn, soft brushing and tailored fit ensures a uniquely warm experience.PREMIUM INSULATING YARN, 8 x WARMER THAN REGULAR SOCKS - When temperatures fall, your feet can be the first to suffer. Ordinary socks or wearing many pairs of socks will often let you down. To be confident in the cold you need a sock with good insulation. The Premium Extra Heavy Bulk Insulating Yarn used to construct these socks provides high performance insulation against the cold and provide up to 8 x the warmth of regular socks.ADVANCED SOFT BRUSHED INNER - The long pile cushioning and intense brushing process means our socks have a super soft brushed inner for extra warmth which maximises the amount of warm air held close to the skin, keeping your feet warmer for longer.TAILORED COMFORT FIT - The 2.45 TOG RATING and additional soft elastic panels allow for a comfortable and tailored fit and help to ensure they stay in place. These socks have been tested according to British Standard 4745 two plate method for thermal tog rating.OCTAVE EXTRA WARM THERMAL SOCKS - Over 30 years of winter clothing experience has enabled us to produce your Octave Extra Warm Thermal Socks. Perfect for wearing on cold winter days with wellies or winter boot, whilst working outdoors or whilst travelling. Ideal for hiking, rambling, fishing, camping, trekking and a must for the ski slopes.Material Composition: 87% Acrylic, 12% Polyester & 1% Elastane