Insert the PM 2.5 filter into the liner. Mask designed to be used PM2.5 filters which are effective for approximately 3 months each . Filters sold separately
Start with holding the adjustment knob at the back of your head
Pull the front part of the mask down while holding the adjustment knob in place
Tighten the adjustment knob for a snug fit
Pinch the nose wire and adjust around ears and eyes for maximum coverage and comfort