When it comes to your comfort, discover the Ashley-Sleep® Chime 12-inch Memory Foam mattress. Its memory foam layer contours to your body delivering amazing pressure relief to the body's major pressure points. This layer is supported by a thick layer of high density support foam which helps reduce motion transfer so you can enjoy an undisturbed night's sleep. This mattress arrives in a box for easy set up. Simply cut away the thick plastic wrap, unroll the mattress and watch it fully expand into place within minutes. Folding power base/box foundation available, sold separately. Features: Crafted of memory foam Includes 1 memory foam mattress only Multiple layers of support and memory foam Reduces motion transfer Hypoallergenic design repels mites, pollen, mold, dander Your choice of 5 standard sizes Classic, crisp white look Dimensions: Twin: 12 inches high x 37 inches wide x 74 inches long Full: 12 inches high x 52 inches wide x 74 inches long Queen: 12 inches high x 59 inches wide x 79 inches long King: 12 inches high x 75 inches wide x 79 inches long California king: 12 inches high x 71 inches wide x 83 inches long Mattress-in-a-Box Information: Arrives tightly packed in convenient portable box or bag Remove from packaging within 72 hours to maximize expansion Use the same night it is unwrapped, however allow 48 hours to return to its original shape After unwrapping, air for a few hours (vacuum sealing sometimes traps odors) Machine-cutting manufacturing cause slight variances in dimensions Once opened, this product is non-returnable.