FIG. 1 is a front elevational view of a tri-zone mattress overlay or the like embodying the design of the present invention;

FIG. 2 is a right end elevational view thereof, which is identical in appearance to the reverse of the left end elevational view thereof;

FIG. 3 is a top plan view thereof, with the front elevation of the embodiment turned upwardly;

FIG. 4 is a bottom plan view thereof, with the front elevation of the embodiment turned upwardly; and,

FIG. 5 is a back elevational view thereof, with the stippling intended to indicate a uniform, relatively flat surface.