Simmons BeautyRest World Class Plush Ballmer Visco King Mattress Only 980-Density pocketed coil springs provides the Beautyrest difference that has become a hallmark of this great brand since 1925 and the gold standard to undisturbed rest and eliminate motion transfer Visco memory foam upholstery layers in select models are added for individualized contouring comfort and support Knit fabrics provide a great level of comfort and feel Plush yet durable premium foams are designed to enhance comfort, conformability and support No flip or rotate the mattress