I have used mattress covers for dust mite allergies for years, so when I needed a new one, this seemed perfect. It seemed oddly folded when I took it out of the package, so I washed it first - in cold water and dried it partially with some other sheets. If you know anything about dust mite allergies, everything should be washed in hot water and dried on high, but something made me not do that the first wash. Should've gone with my gut and not bought this brand because it has managed to somehow fuse/glue itself together all along the side and bottom of the cover. Completely unusable.