These thermal socks should be an essential part of your winter clothing. They keep up to 5x warmer than normal cotton socks. Provide effective thermal insulation against cold Extra-thick Climate regulating and breathable | durable Soft brushed inside thanks to “BRUSHING PROCESS” Flat, soft toe seam | comfort waistband Flexible use: for work, hiking or relaxing on the sofa Material: 92% polyacrylic | 7% polyester | 1% elastane Colours: Black | light grey | wool white Size: One size fits all (36-40) Care instructions: machine wash at 40°C