I have a fairly expensive foam mattress and I decided to take its original padded cover off to wash it. After removing it I knew it was a mistake. Since it’s a cal king trying to fit the tight zippered cover back on was a nightmare  broke the zipper in the process. I purchased this cover to replace the one I broke. It’s a simple full enclosure, no padding, no frills. Looser fit than original which gave me something to work with when maneuvering to put it on. Can’t speak to the waterproof aspect because I haven’t spilled anything on it yet. I can say it does not feel like I’m sleeping on plastic, nor does it make me sweatsleep hot.