It would be useful if you could point to any study that actually tests any mask that is effective in preventing transmission of viruses, and that is available for general use by the public.
I have done some minimal checks on what masks do the best as the barrier we need. I have looked at one function I would want: The use of a flexible outer border on the mask to seal the edges from outflow/inflow. I have found a spandex version on Amazon made by Kurve costing $16.99 for three. It had a interior place to add an additional filter. This reviewer tells one that the flexible fabric does a good job of sealing the edges:
“Most comfortable masks I’ve had yet! Perfect fit and angle. Covers entire face and I can wear my glasses without fogging up. It also has kept shape very well after laundering.”