Constant Temperature Heating: Maintains a steady, soothing temperature to keep your feet warm without overheating. Soft Goose Down: Luxuriously soft and comfortable, providing excellent insulation and comfort. Experience unparalleled warmth and comfort during the cold winter months with our USB Electric Foot Warmer. Designed to fit sizes 35-40, this foot warmer features: Washable Design: Easily removable and washable, ensuring and convenience. 5V Safety Voltage: Operates at a safe 5 volts, making it perfect for household use.