This is a great addition to a new or existing bed. I recently purchased a brand new Tempurpedic Pro Adapt and decided I’d buy one since I didn’t have a “sealed” mattress protector on my previous bed! This is an tiny investment on my $$$$$$$ bed. I layered my bed using the Tempurpedic bed case, then the waterproof stain protector sheet then encased it with the Utopia. My first problem was hoping that the Utopia wouldn’t be able to house all those layer and that it may have a tight fit, but it encased everything just fine. I probably could have purchased a pillow topper and it would have enough room (don’t quote me on that though)! The zipper is the best part! It makes sure no dust mites or bed bugs (ewwww) can get into my mattress…EVER! I’ve recommended it to at least 5 friends and they’ve all agreed with what I said! NOW GO BUY IT!!!