This is a perfect face mask for anyone that wishes to protect themselves from catching any virus or flu, while still wanting to be good to th environment. The mask is reusable and only the filter is disposable. The filter uses a 2-ply system (1 thermoplastic polymer ply + 1 soft resin ply) and offers maximum protection. Each mask comes with 2 exchangeable cotton filters and 7 extra filters. Filters can be purchased separately.