hygenix 3ply disposable face masks pfe 99% filter quality tested in a us lab (pack of 50 pcs) hygenix 50 pcs 3-layers hygenix masks - hygenix premium 3-ply face masks are proven to filter higher effectively as well as provide a waterproof barrier not achieved in masks without the melt blown cloth layer. the outer layer filters out dust, odors and filters 99% of particles larger than 0.1μm (micron).