The waterproof mattress cover with a zippered guard fits mattresses ranging from 6 to 18 inches, and is available ... 6-9″, 6″, 9-12″,12-15″, 15-18″ deep | Closure Type: Zipper ...

I also looked for mattress-protector brands that offer a wide ... (from crib to California King and all the way up to 18 inches deep), which is integral to finding the encasement that best fits ...