There are two types of fogless shower mirror based on how they work:
The first uses a hot water chamber. Pour hot water into the chamber and when the mirror surface reaches the same temperature as the shower steam, fog will not condense on the surface, keeping it clear for as long as the water is warm.
The second uses an anti-fog coating to keep the mirror fogless. These coatings are usually temporary and need periodic reapplication.
Several of Mirrorvana's fogless shower mirrors have dual anti-fog features, combining both an anti-fog coating and a built-in back chamber for the heat transfer method.
You can check out our Shower Mirror Collection on Amazon here, or browse it on our website.