For what it’s worth. I have a big Phase 1 mask with N-95 filters outside the bacteria filters. I got lazy and stopped wearing it and went to a Buff neck wrap you pull over your head, down to your neck. Then when needed you pull it up over your nose and mouth. When I told my infectious disease doctor what I was wearing he just said , yes and now you have Covid! The neck band is good for a days fishing and will keep the sun off your face but has absolutely 0 protection from Covid. Only the N-95 will protect you. So I’m back in my bio chemical mask when I go anywhere!!!! I won’t survive another round of this shit!!!