There is nothing like a hot shower. But that foggy mirror will slow you down if you are in a rush to get ready. Warmup has a solution for you: mirror defoggers. These ultra thin heat pads are easily affixed to the back of your bathroom mirror and will turn on and off with your existing lighting circuit. They make for an excellent upgrade in an existing bathroom or as part of your upcoming remodel. Available in rectangular and round shapes, Warmup Mirror Defoggers are priced between $40 and $100. Warmup/Mirror Defoggers.