After looking at the article for a while, my take away was material aside, the fit matters a lot. They got a very different results with the same materials wit

After looking at the article for a while, my take away was material aside, the fit matters a lot. They got a very different results with the same materials with different fits. I know from using one the peaked N95 has an awesome fit. I guessing the swath was pressed hard to the face, so no leaks which would explain it's good performance. The best of the cotton masks was again the peaked. Fit being important isn't good news. You can get a good idea of the material from the ad, but judging fit is hard without trying it on. The values on N95 can work both ways - allowing air to more easily pass in the in or out direction. If it's in I guess it's not protecting you so well. If it's out it's not protecting others. Out is what they tested. Most seem to be out, but I have one that's in (maybe a manufacturing fault - who knows). It's nicer to wear for long periods than out. In the context of slowing down covid, I'm guessing in is more effective.