Thought "stick" in description meant adhesive
These filters are good, but I guess I misunderstood the wording.  When it says "stick" in the pictures, I thought it meant that there was an adhesive that allowed you to stick it on your mask.  Nope, it's just filters that you need to place inside your mask.  Given that my "origami-style" mask doesn't have a pocket that reaches all the way up my nose, I had to return these.  Otherwise, they were easy to breathe through, and I'd recommend them.
Rating: 4 stars