The Intelligent Circuit Is Built Into The Socks To Ensure That A Specific Temperature Is Reached. There Is Nothing More Painful Than Freezing Feet While Features: 1. Adjustable Temperature: This heating sock adopts advanced adjustable temperature technology, allowing users to choose the temperature that suits them, keeping their feet warm and comfortable at all times. 2. Quick heating: Equipped with a built-in heating chip, the socks can heat up in just a few seconds, allowing you to enjoy warmth without waiting. 3. Safe and reliable: Made of polyamide fiber material with high strength, toughness, and wear resistance, it is safe and reliable without worrying about potential hazards caused by thermal energy leakage. 4. Comfortable : Adopting ergonomic design, it fits closely to the foot shape, providing all-round protection and comfortable support, while greatly reducing foot stress and fatigue. 5. Multiple uses: Not suitable for keeping warm in winter, but also for various such as outdoor sports, work, tourism, etc., bringing you convenience and warmth. Product Description: Our thermal socks are battery operated powered by two rechargeable 3.7V 6000mAh lithium polymer batteries, they can heating up to 10 hours fully charged at the lowest temperature setting (104F-119F). There is a small pocket at the side of each socks to store battery. Our Heated socks are made of comfortable material: 80% cotton, 12% polyester fiber, and 8% spandex, padded reinforced heel and toe, designed with recessed heating help focus heat in the toe to keep your feet warm and cozy. for skiing, hiking, hunting, ice fishing, and any other indoor/outdoor activities in the cold weather.