Which would be the same thing they were saying about masks prior to the end of March 2020. Other than N95 masks that have been custom fit to your face.
I have been fitted for N95, there are two sizes, so it’s not bespoke fitting.
You still don’t see N95s for sale. Plenty of those duckbill KN95 supposed equivalents. Air flows around the edges; they are impossible to seal to the face without tape, and even if you did that and maintained airproof integrity of the tape, there are heat weld stitch marks, which are riddled with holes.
That our nation still is not producing N95s in quantity, and depending on Chinese fakes, is stupidity and madness.
No scientific basis for mask wearing...although wearing one does make it harder to spit on the floor.