1 Pair Heated Insoles Electric Pads Unisex Foot Warmers USB Rechargeable Shoes Features: 1 Pair USB Heated Shoe Insoles Foot Warming Pad Feet Warmer Sock Pad Mat Winter Outdoor Sports Heating Insoles Winter Warm Lining Material: Carbon Fiber. CUTTABLE: Size numbers are set on the back of insoles and you can cut arbitrarily to fit your size. HEATING MODE: It's recomended to use 5V 2A charger or power bank output port to achieve about 42 centigrade.The USB heating insole heats when plug in,and it does not heat when it is powered off. EASY TO USE: Put the soles in your shoes and connect them to the power supply to enjoy the warmth.The heating soles can be cleaned, CAUTION ensure drying before use. Product Description: Material: EVA Lining Material: Carbon Fiber. Maximum Voltage: 5V. Size:25x8.5cm/9.8x3.3in Heating Range: Within 35 Shoe Line. Including: 1 pair of insoles 1.5m USB cable 1 instruction manual