Does anyone know a paintball/airsoft mask that you can AIM down your sights and is fog proof? Thanks. No price limit

One answer Tokyo Marui's low-profile face mask. Kinda old product so I don't know if it's still in production. Looks very nice, semi-flexible lower face protection allows the ease of looking down your traditional iron sights (but not as comfortable as no mask/using a head wrap). Even has a ventilation and a small, battery-powered fan system to prevent a lot of fogging (but "absolute zero fog"? might not be possible without anti-fog spray).

You can also try looking for its clone version, which is the same thing but made of slightly lower quality material, but for the price, it does the same job as the original mask.

Not want to spend a lot of money? You can try the Sansei Mask, which is also low-profile but utilizes a metal mesh lens instead of clear plastic, which, of course, does not fog up at all. However, it is recommended that you wear shooting glasses underneath mesh masks to prevent shattered BB's going into your eyes, a not-so-common situation for very cheap mesh.