Works as a mask sealer
I have two of these. They work well over a surgical mask, sealing the sides and over the nose.  If you take your mask off and on frequently, they can be a bit awkward as they flop around--but they work.  I find that a half inch square of adhesive backed velcro tape wrapped around one ear loop and a similar square of the furry backed tape wrapped around the other ear loop makes a quick release for earloop masks that allows the loops to fasten behind the head.  This also seals the sides of a mask and the nose (with a metal strip) very well.  They are easy to release and refasten.  You can use Strenco 1 Inch Self Adhesive Hook and Loop Strips - 5 Yard Set from Amazon - makes a lot of fasteners.
Rating: 4 stars