The bedmaster serene 800 pocket mattress will soon have you sleeping sounder than ever before constructed using some of the key design features that are incorporated into the construction of firmer orthopaedic mattresses the serene 800 is bedmasters medium firmness alternative the mattress uses pocket spring technology offering exceptional support through individually nested springs which react like pistons and provide a bouyant sleeping surfacedeluxe polyester fillings and a damask cove