Spring Insole Warm Pad

Easy to use. Just put on your shoes and turn on the power to enjoy the warmth. Soft and comfortable, fine workmanship, ultra-thin design, maximum elasticity. Use waterproof material, which can be cleaned directly. Specifications: Color: Black Material: Carbon Fiber Function: Foot Warmer Applicable Gender: Unisex Maximum Voltage: 4.5V Heating Range: Within 35 Shoe Line Insole Thickness: 4mm / 0.20'' (approx.)   Package Includes: 1 Pair X Heated Insoles 1 X USB Cable