This is our most popular mattress. It has an excellent feel – plush but not mushy. Its 660 Luraflex spring unit does great with people from 100 to 200+ pounds. Like with the Firm top mattress, we start with a fabric insulator over the spring. Next, we use a layer of medium firm upholstering foam. The rich Belgian damask outer fabric is quilted to an inch and a half of very expensive high-density super soft foam and an inch of luxurious fiber loft batting-nearly 3" thick and very pleasing to the touch.