
Despite your initial elbows-and-as*holes mask prep work, it still happens occasionally: your mask fogs. To remedy this, of course, you have several options:
You can spit in your mask. You can use commercially available anti-fog products. You can use Wide-i's magnetic fog wipers.Wide-i's wipers, sold in pairs, allow divers to slide a magnet along the outside of the lens, causing an inside magnet to move in unison to remove fog. Claiming chemical antifogs are not re-apply-able while diving (which is true), and arguing that rinsing a mask underwater "requires training" (uhh...), Wide-i promises that the "strength of the magnets is designed to assure that they stay on the mask at all times, even upon a clumsy or splashy entrance into the water." What do you think?