Features 1. Soft & Breathable: Made of quality material, soft and comfortable to wear. Keeping warm, sweat proof and breathe freely. It will keep the foot warm in cold winter. 2. Electric Heating Socks: These Heating socks can stimulate circulation and provide a better and safer experience. Ideal for arthritis feet and chronic cold feet and stiff joints. Give yourself a warm winter. 3. Safe and Warm Sock: Heated socks powered by 7.4V/2200 mAH batteries, providing you with up to 6-7 hours enduring warmth. 4. Multipurpose: Ideal for hunting, skiing, ice fishing, hiking and sports events. Especially at the Christmas market you can wear these heatable socks to stay warm. 5. Best Gift: The rechargeable electric battery socks for men and women are the best birthday choice. Christmas Halloween Thanksgiving Mother's Day Father's Day foot warmer hiking socks. Specification Material: Cotton Color: Black, Grey Size: M Package Size: 19 10 7 cm Weight: 99 g Voltage: 5 V Battery: 7.4 V/2200 mAH Charging Time: 3.5 hours Using Time: 6-7 hours Heated Temperature: 35-55 Package Include: 1 Pair Heated Socks 1 USB Charger