Used to be great, but quality is degraded
I gave this mask a 5 stars a year ago. I bought directly from factory and paid high shipping and filter was pretty thick and mask is high quality. Last 3 bought from Amazon, mask material got thinner. Filter material got thinner. I am holding both and I can feel quite a difference. That makes me doubt about real efficiency of that %99 claim. Who knows !!!
Rating: 3 stars