Ultimate Series Mattresses. most advanced mattresses, offering luxurious details and features like "Instant Comfort Control" for perfect support. The Ultimate Series delivers the ultimate in comfortable, restful sleep. A layer of NASA-designed visco elastic "memory foam" is a standard feature ONLY on our Ultimate series beds. As an ADDED BONUS, the Ultimate gives you TWO removable pillow-tops. You’ll love having a backup so you can keep your bed intact when one pillow-top goes to the dry cleaner. And, of course, your back will thank you for the superior support of our patent-pending, chiropractor-endorsed dual interlocking air chambers design. Comfort and Convenience Features For A Great Night's Sleep .thickest, most comfortable mattress with 11-1/2 inches of luxurious comfort Two side-by-side, dual interlocking variable support air chambers on queen and king beds / one dual interlocking chamber on full/double beds Comes standard with a 1-1/2 inch layer of Nasa-designed visco elastic "memory foam" 1-1/2 inch layer of breathable Comfort Vent™ foam keeps bedding cool and dry Two removable, cleanable pillow-tops: one silk blend and one wool blend Internal comfort control system with two remotes on queen and king beds for dual adjustability / one remote on full/double beds Instant comfort button on remotes lets you personalize your comfort and "remembers" your favorite firmness level Premium quality Belgian damask ticking Contour-cut foam rail internal support system 20-Year limited warranty 90-Night 100% satisfaction guarantee