- Size: The winter foot warmer measures 2928 cm (11.411 inches), featuring a spacious pocket design for easy foot entry. The smooth zipper allows for convenient detachment and cleaning. - Material: Crafted from high-quality flannel composite fabric, this foot warmer is soft, thermal, and skin-friendly. Its durable construction ensures long-lasting use, while the anti-slip sole design prevents slipping for added safety. - Easy to Use: This heating pad connects effortlessly to a charger, USB interface, computer, or power bank (not included) via a USB cable, providing flexibility and convenience for use anytime, anywhere. It operates safely at a voltage of 5V. - Constant Temperature: The heating range is 40℃ (104℉) to 50℃ (122℉), maintaining a comfortable temperature that does not cause dryness or overheating. Use Scenarios: 1. Use it while relaxing at home on cold winter days, keeping your feet warm and cozy while you read or watch TV. 2. Perfect for use in the office, providing warmth during long hours at your desk, helping to improve focus and comfort. 3. Ideal for chilly nights, use it while you sleep to ensure your feet stay warm without the risk of overheating.