A polyurethane foam block can include a base having a plurality of recesses and a top surface having a plurality of connective components protruding outward from the top surface where each connective component of the plurality of connective components can align with a recess of the plurality of recesses. The polyurethane foam block can include a plurality of sidewalls extending upward from the base and defining an interior and a plurality of partitions extending from the base to the top surface to divide the block into a plurality of cavities. A wall can include base blocks and header blocks. The header blocks can be shaped and constructed similarly to the base blocks with one exception being the header blocks can include an-upward facing channel cutout. The wall can include a beam extending through channels of header blocks.