Environmentally friendly and cuttable material: the heating insert is made of the latest highly efficient carbon fibre material heater, which is safe and environmentally friendly. The heating surface is large and the heat is distributed evenly, effectively stimulating blood circulation in the feet and helps to resist cold. You can easily cut the sole to any shoe size and shoe, adjust to your shoe size, cut 34-40 size (S), or 40-46 size (L). 3 mode temperature setting: the heated insole has 3 heat settings, high temperature mode: 4 hours (55C), medium temperature mode: 6 hours (50C), low temperature mode: 10 hours (40C). You can freely adapt to the weather. Note: You need to press the switch on the remote control to start heating. Wireless remote control and removable battery: controlled by the wireless remote control, you can easily control the insole without taking off your shoes. Built-in safe 2100mAh high density lithium polymer battery, circuit and battery are protected by a steel housing, are charged via USB and are safe to use. The battery can also be removed separately. You can wash heated insoles without hesitation. Winter gift: Even heat distribution ensures optimal blood circulation in the feet. A heated insole keeps your feet warm in cold winters and relieves stress and shoe pain. Perfect as a gift for family, elders and friends in cold winter. Keep your feet warm: the heated insole can effectively protect your feet from cold and foot discomfort. Suitable for outdoor mountaineering, hiking, skiing, cycling, fishing, camping, etc. It is also the best choice for the elderly and people who are afraid of cold.