3-layers of protection Not-woven outer layer + filter paper layer + skin friendly not-woven inner layer.Breathable and comfortable,low breathing resistance. Comfortable ear-loop Comfortable ear-loop, extra-soft ear loops eliminate pressure to the ear. You feel comfortable with periods of time usage.this disposed. Hidden nose stripes Inset with bendable metal nose strips freely adjust shape according to face shape, increase facial fit, adjustable according to nose height. Better protection Perfect when travelling through congested airports, bus terminals, malls, parks, and busy city streets.