A zoned mattress including at least a head firmness zone, a leg firmness zone between the head and leg firmness zones overlaid by a knit top fabric knit from threads of at least two different colors to define three different firmness indicating areas corresponding to the three firmness zones of the mattress. At least one of the firmness indicating areas is defined by threads differing in color as compared to the color of the threads defining at least one of the two remaining firmness indicating areas.