Features 1. Long Heating Time: Rechargeable heated socks can be equipped with a 4000mAh large capacity battery, providing you with up to 10 hours of lasting warmth. 2. Material: These heating socks are made of premium cotton material. Combined with ergonomic design, the socks have good breathability and excellent sweat wicking effect, and you will feel very comfortable. 3. Multiple Heating Methods: The heated socks are designed with 3 heating settings, including high heat, medium heat, and low heat. The heating socks reach a temperature from 45°C to 60°C and can last for up to 4 hours. 4. Upgraded Heating Design: The heating element of this pair of socks has been upgraded to a carbon fiber wire heating element, and the heating wire has been hidden in the forefoot position, so that your toes will quickly feel warm and you are no longer afraid of the cold. 5. Wide Use: For people who always feel cold in their feet when winter comes. And it is also great for men and women who love hunting, skiing, ice fishing, and other winter events. We have a special pocket design to place the battery pack, providing you with full comfort whether you are walking, running, or sleeping. Specification Material: Fabric Color: Black Size: 33 x 25 x 5 cm Weight: 175 g, 170 g, 140 g Battery: 4000 mAH, 5000 mAH Voltage: 3.7-5 V Temperature: 45-60 Package Include: 1 Pair Heated Socks or 1 Pair Batteries About Shipping: All items will be shipped within 3 business days after the payment is received. During the process of shopping, if you have any questions, please feel free to contact us, we will reply you within 24 hours, wish you a happy shopping Thanks for your cooperation and we'll make you feel satisfied.