Patent ID: 7428764

Claim:
A cushion assembly comprising: a. a top layer; b. a bottom layer having a top side and a bottom side, said bottom layer including i. a matrix of supportive material, said matrix of supportive material comprising open-cell polyurethane foam; ii. a plurality of inserts, said plurality of inserts situated within said matrix of supportive material, each of said plurality of inserts having a top, a bottom, and a length therebetween, said length having an outward facing surface, said plurality of inserts comprising closed-cell polyurethane foam; iii. wherein said top of each of said plurality of inserts is proximal to said top side of said bottom layer, and said bottom of each of said plurality of inserts is proximal to said bottom side of said bottom layer so that said length of each of said plurality of inserts is positioned substantially perpendicular to said top side and said bottom side of said bottom layer; iv. wherein said closed-cell polyurethane foam has a greater compression modulus than said open-cell polyurethane foam; v. wherein said plurality of inserts are bonded to said matrix of supportive material such that said matrix and said plurality of inserts mechanically interact when said cushion assembly is subjected to a compressive load; and vi. wherein said plurality of inserts are configured to both compress and buckle when said cushion assembly is subjected to said compressive load.