The Delta Variant requires a higher quality mask

N95 masks and delta variant: What you need to know - The Washington Post:

because the delta variant is much more easily transmissible than previously circulating strains of the coronavirus, “we really need highly protective masks along with everything else,” Marr said. “Where a simple cloth mask was helpful before, it’s not helpful enough now,” particularly for people who remain unvaccinated.

My work held an in-person meeting recently and was handing out N95 masks, the cool black ones.  I filled my satchel with them.