I found you while researching how to verify a mask is good as an end-user, because I cannot get a good seal out of any of the six types of FFP2-masks I have tried. On the one hand, I've always been on the lookout for something similar. On the other hand, there are a few showstoppers that keep me from buying.

* Looks. Even if I can decide to look like the Reddit alien in a motorcycle helmet while everybody else is wearing an FFP2 mask, there is no way I can persuade my wife or kids. Would it be possible to make the exhaust pipe a bit more inconspicuous? E.g. inhale from the left cheek, exhale to the right cheek?

* Filtration efficiency and trust. There is a reason the FFP2/FFP3 standards test with 0.3um sized particles - those are the most difficult to filter out. Your marketing copy talks about 0.4um and 0.1um, and the headline screems about 3um large virus particles, which are even less relevant. Even though the 0.4um numbers look close to FFP3, any official certification is missing. Is it safe to say that your product does not meet the FFP2 standards?

Additionally, I'd love a mask that does not saturate out within minutes if I am panting (from chasing after kids).

https://fixthemask.medium.com/the-standards-for-face-masks-i...

* Sizing. How do I know which size I need? Maybe you could publish a guide like the CPAP mask manufacturers do. https://www.resmedshop.de/media/pdf/b1/e4/06/ResMed-AirFit-F... https://www.resmedshop.de/media/pdf/03/b0/57/ResMed-AirFit-F...

* Facial expressions. If you could make the mouth covering transparent, it would show my mimics in a conversation. That could be a killer feature, especially for socializing (or salesy jobs).

* Glasses and field of vision.

* Sticker price shock. Most FFP2/KN95 masks are counterfeit and none have a good seal, so I might as well grab the ones for $0.17 a piece from aliexpress. But, I am already spending much more on other Covid safety measures.

EDIT: Can you give me an accessible way to experience the mask's safety? So far, the best criterion I have come up with is if I can smell the smoke when I'm standing next to a smoker. In defense of that metric: There are absolutely no credible alternatives proposed on the internet. Mask fit used to be tested officially with noxious smoke. Cigarette smoke particles are pretty close in size to the virus-laden droplets. But in practise, an FFP2 mask passes this test only if I tape over all of its edges with a band-aid, and my skin won't tolerate that day-in day-out.