The Chime 12" Hybrid from Ashley's Sierra Sleep line combines the proven support of individually wrapped coils with several layers of foam to give you a mattress that sleeps both responsive and cushioned. At the core, two perimeter rows of 9-inch pocketed coils work independently to follow your body's contours without transferring motion across the bed. Above that, a gel memory foam layer targets lumbar support specifically, helping your lower back decompress overnight rather than just sink into place. Softer quilt foam and a comfort support layer above it build the plush surface feel — Ashley rates this one ultra plush, so expect genuine give when you lie down. The whole construction is CertiPUR-US certified and works with an adjustable base if you want that option. It ships compressed in a box; bring it to the room, unroll it, and give it 48 hours to fully expand before sleeping on it. Backed by a 10-year non-prorated warranty.
