I just ordered 2 Mira Safety CM-6M Protective masks from Echo Sigma. They are a bit pricey but really extremely well made. These are professional quality full face respirator masks that come with 20 year filters that filter out virtually every possible gas and biologic agent and also have the ability to add an auxiliary filter as well. You know, with everything going on in this country now you never know when an item like this will be needed, and it probably will! If you shop Echo-Sigma, you believe in being prepared already... these are well worth the investment in your life.