There was a great w5 episode that tested the two and others. If you don't move l...

ipaddr on Nov 5, 2021 | parent | context | favorite | on: Why is Delta so infectious? New tool spotlights li...

There was a great w5 episode that tested the two and others. If you don't move look straight ahead they are about the same if you bend your head down or move forward the air gets in. There is a reason why they are plentiful and much cheaper.