eautyrest BLACK is more than a mattress, it’s a haven for deep, restorative sleep that inspires your senses. The Beautyrest Black experience goes beyond mere comfort. It creates a restful escape where sleep is the ultimate luxury. The Calista is designed with 1700 legendary Beautyrest® Pocketed Coils providing conforming back support and unparalleled motion separation. 10 Year Limited Warranty. The Classic King Adjustable base transforms your bed into more than just a place to sleep. By using this base, you can experience ideal comfort and support, no matter what you're doing in bed. Whether it's catching up on emails, reading a book, or watching your favorite television show, the base adapts perfectly to your situation, allowing you to experience a level of comfort that you won't find elsewhere. The Classic adjustable base works with both head and foot rails and includes headboard mounting brackets. The head and foot adjustments work independently to allow for infinite positions. The one-touch return to flat position makes it easy to reset your bed. Take your sleep to the next level with the Classic King Adjustable base.