The filters we sell are 100% NonWoven Polypropylene fabric that is breathable and washable!
We recommend replacing your filter after every 1-2 uses; if you use your mask everyday, for several hours a day, then it's best you replace your filter daily.
You can hand-wash your filters with a mild detergent (or antibacterial soap) and cold water.
DO NOT place the filters in the dryer; HANG-DRY ONLY.
DO NOT iron or apply any type of heat to the filter, it will melt!
*Note, "Kids" Filters are half the size of Adult Filters.