Wave springs and cushioning articles containing the same

A mattress comprising:

• a base foam layer;
• a sidewall disposed about a perimeter of the base layer to define a cavity having a length, a width and a height dimension;
• and
• one or more three dimensional wave springs disposed within the cavity and configured to correspond to the length, the width and the height dimensions of the cavity, the one or more three dimensional wave springs comprising:
• a lattice structure comprising a plurality of alternating strands stackedly arranged to define a height dimension of the wave spring, wherein each one of the alternating strands have one or more upward and downward undulations arranged such that an upward undulation of one strand is connected to a downward undulation of an adjacent strand to define multiple cells there between arranged in columns and configured to receive a compressive force, wherein the lattice structure further comprises a non-linear shape when viewed top down, wherein the non-linear shape of the lattice structure defines a length and a width dimension of the one or more three dimensional wave springs.