- First layer of spunbond cloth filters micron-level dust;
- Second layer filters industrial pollutants, automobile exhaust, second-hand smoke, and pollen allergens.
- Third layer of activated carbon cloth filters micron-level dust;
- Fourth layer offers filter density for smaller material.
All very well made, prompt delivery. I use these daily. Glad to have them
I've ordered these from a few places and these were the best quality. Plus super fast shipping and cute packaging and a nice gift. Thanks!
I've ordered these twice already and will again. They came quick, well packaged and with a little gift! Love Lumily!