Patent ID: 8898842

Claim:
A mattress overlay system, comprising: an elongate mattress overlay having opposed sides and opposed ends defined by spaced upper and lower faces and a perimetral edge extending therebetween; and operatively associated positionally adjustable, relatively moveable, under-overlay elevation structure configured to be selectively placeable in conditions of transverse under-engagement relative to the overlay between the opposed ends and sides thereof to create substantially non-inclined, elevated, depth-supplemented bands at locations along the length of the overlay; the elevation structure being one or more elongate risers each having upper and lower faces spaced by a perimetral edge, wherein the overlay and the elevation structure each further comprise: a dynamic-response core expanse formed of an open-cell compressible viscoelastic foam having, in the overlay and the elevation structure, a pre-stressed, about 8-10% compressed, relaxed-state volume to create a pre-compression condition in the overlay and elevation structure; and an elastomeric, moisture- and gas-flow-managing, differential-thickness coating structure load-transmissively bonded to the entirety of the outside of said core expanse to function as a dynamically-responsive unit therewith, and possessing a relaxed-state, internal, pre-stressed tension condition, with the coating structure in some, respiration-window regions, being formed to be moisture-previous and gas-permeable, and in other, on-respiration regions, being formed to be substantially moisture-impervious and gas impermeable, and having an outer surface adapted to provide an interfacial stiction grip between he lower face of the overlay and the elevation structure when engaged, wherein said coating structure of each riser provides one or more of said moisture-pervious, gas-permeable respiration-window regions at one or more locations on said perimetral edge, said perimetral edge of each riser defining parallel pairs of ends and sides thereof, and wherein one or more of said respiration-window regions are disposed, one each, on one or both ends of riser.