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 interior through “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 Colors: Black | dark grey Size: One size fits all (41-45) Care instructions: machine wash at 40°C