The problem with most fog-free mirrors is that the coating on the surface makes you feel as though you're shaving in one of those distorted fun-house mirrors. That's why we recommend this one by Ace, the same company that made your grandad's pocket comb (they relaunched a more modern line in '07). Instead of chemicals or coatings, it relies on the delicate balance of physics to combat steam. A reservoir, behind the mirror, fills with warm water that equalizes the air temperature, thus eliminating fog. $19, at Amazon.com