If you're referring to the material used in most goiter style masks, then I can vouch for it doing nothing more than the aerator filter on your kitchen sink. Yet this is accepted by "science following" industries as an effective mask against an aeresol-transmitted disease. I get the "better than nothing" argument but forgive me for not feeling comfortable with the "any mask is fine" messaging. Either recommend/advertise/mandate masks that are tested to prevent spread of infection and fit tested when appropriate, or drop it.