Stearns & Foster Estate 15" Firm Pillowtop Innerspring California King Mattress pairs individually wrapped coils with a memory foam pillowtop to deliver firm, contouring support that’s ideal for back and side sleepers. The 15-inch profile features a quilted navy polyester cover, adjustable base compatibility, and is made in the USA with a 10-year warranty and a sleep trial so you can test it at home. It’s designed to support reading, lounging, and full nights of rest in a California King scale.