TV Direct - Below Zero Heat Retention Thermal Socks Unisex Design. These innovative thermal socks are designed to provide unbeatable warmth and comfort. With aluminized threads that reflect your body heat they keep your feet warm dry and cozy making them ideal for both outdoor adventures and indoor relaxation. The versatile unisex design ensures they're suitable for anyone and they're easy to maintain as they are machine washable. Crafted from a blend of 91% polyester 5% nylon 2% metallic and 2% rubber these socks offer a winning combination of durability insulation and comfort ensuring your feet are well-cared for in any situation. - Black - Small/Medium