Mirror defogger, mirror demister Mirror defogger or mirror demister, produce by Bagen under yash brand, which is a thin heating pad for mirror. Mirror defogger is the key part of fog free mirrors, any mirror applied defogger or demister resulted in fog free. Heating pad, mirror heater Mirror heater is a kind of electric mirror heating pad, They provide heat energy, which transfers directly to the mirror, resulting in a warming of the mirror surface. This prevents condensation. yash heating pad is double insulated and with a low surface temperature there is no overheating. The heater can be left continuously running.