Easy to use and it will fit nearly any mask
These masks can be folded to fit into just about any mask -- except maybe those with the visible panel to show the mouth.  They seem to be very effective.  Cheap enough to use and discard.<br /><br />I wish they were just a little more sticky.  They aren't easy to separate from the stack, but once off, they don't stick to the mask as well as they might.  Otherwise, I love them and will be ordering more.
Rating: 5 stars