Product review (5 stars): Excellent wick filter with a metal mesh to provide rigidity.
I was a bit hesitant to purchase these off brand filters for my humidifier at first but I am glad I did.  They are far and away better than the Sears brand I was using and are much more reasonably priced.  The Sears brand would start to sag after a couple of weeks and then shortly fall apart.  These filters have a metal mesh on the outside which provides enough rigidity to keep them locked in place and from falling apart.  Overall, I think these are well made filters and do an excellent job.