The original British designed Octave Thermal Socks has been engineered to provide more Warmth than regular socks. The combination of insulating yarn, soft brushing and tailored fit ensures a uniquely warm experience.PREMIUM INSULATING YARN - 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 Insulating Yarn used to construct these socks provides high performance insulation against the cold.ADVANCED SOFT BRUSHED INNER - Our socks have a 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 1.2 TOG RATING allows for a comfortable and tailored fit - so make them ideal for all-day wear. These socks have been tested according to British Standard 4745 two plate method for thermal tog rating.OCTAVE EXTRA LONG THERMAL SOCKS - Over 30 years of winter clothing experience has enabled us to produce your Octave Thermal Socks. Extra Long for maximum coverage making them perfect for wearing on cold winter days with wellies or winter boots, whilst working outdoors or whilst travelling. Ideal for hiking, rambling, fishing, camping, trekking and a must for the ski slopes.Material Composition: 85% Acrylic, 10% Polyester & 5% Elastane.