I wanted to try the KF80 mask since Aaron Collins, “The Mask Nerd” on YouTube said they filter at a much higher number than 80%. I think he said about 97%. The KF80 masks are much easier to breath through than the KF94 and I use them for less intense situations where I don’t need the absolute best filtration. I like to wear it when in a crowd outside or when exercising in a group. The breathability makes for a pleasanter workout. Also, these masks are stiff enough that they don’t collapse into your face. The fit is excellent due in part to the adjustable strings at the side. I think this mask, while large, would be comfortable for most average to large size faces. If you have a very small face it might run large.