In an in-person conversation, someone mentioned that they thought there was an N99 version of the 3M Aura. I'd like to have some of these for the next time there's a wildfire, but I don't find anything about this online. Do you know what they could have been referring to? I wear only the 3M Auras because the builtin foam nosebridge is the only thing I've ever seen that avoids fogging my glasses.