To help you decide, consider . . . Decide on Bed Size. If you have a sleeping partner - two are recommended. However, two can sleep comfortably on a single air chamber - by simply making the desired firmness adjustment while both are together in bed.
Every mattress needs to be supported, of course.
Whether or not you need a new supporting foundation depends on whether your present box spring, or other type foundation you now have - is suitable. Foundations are built to standard Bedding Industry Specifications, fully assembled, ready to use, and are covered with the same materials as mattress style ordered - for a perfectly matched set. Bed Frame - Regin Foundations are supported by standard steel frames used under ordinary box springs and, if needed, Regin has available the size to match your new foundation.