Material Composition:53% Cotton, 42% Acrylic, 5% ElastaneCare Instructions:Machine wash up to 40 degrees, gentle cycle, Do not Dry CleanDescription:Keep warm with HEATTECH: thermal clothing technology from Japan. This innovative fabric absorbs and retains body heat to keep you warm. Fibres one tenth the width of a human hair trap air to prevent warmth from escaping, while wicking away moisture from the body to keep you dry. These ultrafine fibres provide a smooth feel against the skin and can even neutralise odours to keep you feeling fresh.HEATTECH Extra Warm Cotton is 1.5x warmer than classic HEATTECH, making it perfect for colder days. A special knitting technique produces a thicker material with greater heat retention, while brushed cotton feels warm and cosy against the skin.The updated brushed texture is now even softer. Comfortable fit to the ankle.- The updated brushed texture is now even softer. – Soft, stretchy fabric packed with bio-warming, insulating, moisture-wicking, quick-drying, and shape-retaining comfort features. – The brushed surface is made of 100% cotton and is gentle on the skin. – Full length keeps you warm down to your ankles.Images shown may include colours that are not available.