The much-loved and best-selling XTM Heater sock is the perfect choice for those looking to maximise warmth at an affordable price. This thick sock has a 40% Australian Merino wool content and is not only super warm, but soft and comfortable. Available in mens, womens and kids in a great range of colours. - 40% Australian Merino, 40% acrylic, 15% polyester, 5% elastane - The ultimate sock for warmth on extreme days - Soft and comfortable for all day wear - Certified Carbon Neutral Product