My last point
A quote from the Lancet study you mention that
@ert linked to.
"as was use of face masks (including N95 respirators or similar and surgical or similar masks [eg, 12–16-layer cotton or gauze masks]) and eye protection (eg, goggles or face shields). Added benefits are likely with even larger physical distances (eg, 2 m or more based on modelling) and
might be present with
N95 or similar respirators versus medical masks or similar. "
and
" Despite this step, our findings continued to support the ideas not only that masks in general are
associated with a large reduction in risk of infection from SARS-CoV-2, SARS-CoV, and MERS-CoV but also
that N95 or similar respirators might be associated with a larger degree of protection from viral infection than
disposable medical masks or reusable multilayer (12–16-layer) cotton masks. Nevertheless,
in view of the limitations of these data, we did not rate the certainty of effect as high. Our findings accord with those of a cluster randomised trial showing a potential benefit of continuous N95 respirator use over medical masks against seasonal viral infections"
(my bolding)
Not an old t-shirt in sight...
Enjoy and farewell x.