• USB electric insoles designed to keep your feet warm in winter • Generate heat evenly and efficiently, providing rapid warming • Soft, comfortable, and with a high-quality finish • Easy to use: place them in your shoes and connect to a USB power source • Ultra-thin (4 mm thick) and flexible design for greater comfort • Distribute heat evenly across the entire sole surface • Water-repellent material, washable and easy to clean • Can be trimmed to fit the shoe size • Suitable for most shoes • Made of elastic EVA fiber • Operating temperature: approximately 40-50 ℃ • Required voltage: 5V / 2A • Package includes: 1 pair of heated insoles, 1 adapter, and 1 USB cable • They must be turned on during use for continuous heating