Manufacturer's Description (SleepLogic): 

"A step above the 640 line, ChiroSense 720 Series mattresses offer a luxurious quilted surface with superior comfort options. Choose from ultra firm, ultra plush and pillowtop for your sleep solution. Firm support with a luxurious quilted surface Patented SupportSense® innerspring features helical wires that are 25% heavier in key support areas for three zones of support.  Foam encasement prevents edge breakdown; lets you utilize the entire sleep surface.  High-density block foam under spring absorbs energy, helps reduce motion transfer.  Exclusive Neural Net® grid helps keep your spine in a natural position. High profile ComfortTech™ boxspring provides stability."