3-pack of Vassalli non-medical PM2.5 filtered masks with 3 filters per mask – 9 filters in a 3 pack of masks.
- The masks are reusable with or without the filters
- Can be washed in warm water by hand.
- Bridge Insert to mold around nose for a comfortable fit.
- Adjustable ear loops for an even better fit.
- Masks consist of 4 layers
- 100% Cotton
PM2.5 is an ISO standard referring to tiny airborne particulate matter that are the less than 2.5 microns (0.0025mm) wide – or 3% the size of human hair. A PM2.5 filter is designed to filter airborne particulate matter smaller than 2.5 microns. ISO describes the efficiency of such filters to be capable of filtering particle sizes in the range of 0.3 microns to 2.5 microns.