It's a mattress pad. It's new. I expect it will wear out fairly quickly as the side material is quite thin. Not unusual for a mattress pad.I was very pleased with the quality. They fit well, do not slide around, and do not make any rustling noises. Some reviewers mentioned a bad smell. I ordered 2 of these - one smelled clean and the other had a slight unpleasant odor. I always run new bedding through a cool wash, and the odor completely disappeared. They also dried quickly and without wrinkles on low heat. The padding was thick enough and the elastic holds it firmly in place. Hope I never need to find out how waterproof they are!Waterproof Lies Lies Lies.As soon as I opened the package I realized I had been duped. It's just a pretty mattress cover. IT IS NOT WATERPROOF AT ALL. I give it 1 star because there is not a lower option. :(We’ve only used this for a few weeks and so far it has done its job. It is pretty light weight so it will be interesting to see if it holds up for the long run. We are using to for a young child who has frequent accidents.I will be honest I wasn't particularly looking for extra padding, more mattress protection. When the pad arrived I thought I had received just that, due to the fact that it's quite thin. Boy was I mistaken!!! It made such a difference! It feels like I'm sleeping in a hotel bed now! I am beyond impressed!I use these encasements to cover mattresses and box springs in my cottages and motel rooms. They are well-made, I especially like the large Velcro tabs that cover the end of the zipper, providing extra protection against bedbugs and dust mites. I just started using them so I’m not sure how well they hold up but they seem to be very durable.Good quality and really nice material. Just wished it had actual nylon for 100% water proofBunches up a bit, but overall pretty great.