12 Inch Ashley Hybrid King Adjustable Base and MattressKing Adjustable Base and Mattress Rise to new heights and get the sleep you've always dreamed of with the Hybrid 1200 king mattress and king power base. Feel the support of a truly traditional coil mattress which contours to your body for a comforting feel. High density foam provides the firmness you love. Gel memory foam provides restorative support for your lower back. Maximize your comfort with a zoned massage that provides an upper or lower body