Added protection
With new variants of Covid evolving lately, the new advisory is to look for kn95 masks, or double mask.  These slip in filters can certainly help in adding layers under your existing mask, and if you have a mask that accommodates filters, then perhaps doubling or tripling up on these filters is a good idea.  Otherwise you can even simply put one of these under your existing mask.  Now I haven't done that as I do have a mask that accommodates filters, so I don't know how well it would stay put loosely under a mask, but for ones that take filters it seems to fit well for me.  They seem to be good quality from the look and feel, and a necessary tool for todays day and age.  They also represent pretty good value at 30 for under 10 bucks.  I do recommend them, and hope that everyone wears a mask. It's just common sense, which I guess isn't often so common.
Rating: 5 stars