Features: Arch-Away design: Plastic wire across middle section of masks forms an arch to keep masks saway from nose and mouth at all times 3 best features in 1 mask, ultra high filtration, ultra sensitive & ultra breathable, inner layer made of cellulose material, both sensitive & breathable, completely lint free & fuzz free, no dye, no chemical, gentle to the skin, moderate fluid resistant, meets ASTM Level 2 standard, 120mmhg, softest ear-loops in the market, eliminate pressure to the ears, PFE 99.7% at 0.1 micron, BFE 99.5% mfg controlled cleanroom environment, low particle shedding, rated category 1 for Helmky Drum Testing, latex free, fiber-glass free, 16 attractive colors/patterns, 50/box