Heated car seat covers work by achieving exactly the same outcome as heated seats in luxury cars, only at a much cheaper price and with no time-consuming installation required. Wires are fed through the interior of the heated seat cushion known as resistors because they resist the flow of electricity through them which creates friction and thus heat. If the resistor was on for an unlimited amount of time it would continue to heat the seat and could become a fire hazard so thermostats are employed to ensure that this doesn’t happen. When the heater cushion starts to get too hot the thermostat steps in and switches the heating element off. When the cushion cools down the thermostat then turns the element back on which maintains the heat at the desired level.