We were told when we purchased our mattress that we would need to have a mattress protector or the warranty would be voided. So we ordered this one. We aren't wowed by this mattress protector at all. It's very loose fitting especially at the sides of the mattress, which creates wrinkles or ridges in the mattress protector. Therefore, when you put the sheet on top of it everything is very bumpy. We do a lot of tugging, pulling, and tucking to get a smooth fit. We expected more from this mattress protector for how expensive it was.