Do you offer a California King Ascent Base? Yes! We do offer a California King in our Ascent Base! See all of the size options for the Ascent Base, HERE. Related articles Does the mattress stay in place as the PowerBase is adjusted? What is the Ascent Base Return Policy? Does Purple sell mattress toppers? Do I place the Purple™ Powerbase on an existing foundation? Will the Purple® Mattress help my lower back pain?