Mattress and side rail assembly with high airflow

A mattress assembly, comprising:

• an inner core free of open channels comprising a viscoelastic foam layer the viscoelastic foam layer having an open cellular structure comprising planar top and bottom surfaces, a density less than about 3 pounds per cubic foot and a hardness less than about 15 pounds-force;
• and
• a multilayer side rail assembly configured to contract only sidewall of the inner core, wherein the side assembly comprises a layer of a polyurethane foam comprising an open cellular structure having planar top and bottom surfaces, wherein the open cellular structure comprises about 10 to about 40 cells per inch, a hardness of about 35 pounds-force to about 100 pounds-force, and a density of about 1.2 pounds per cubic foot to about 2.0 pounds per cubic foot, and wherein a percentage of intact windows between adjacent cells in the open cellular structure is less then about 50%,
• wherein the layer of the open cell polyurethane foam is in fluid alignment with the viscoelastic foam layer and is configured to permit the flow of fluid from and to the inner core through the side rail assembly.

A mattress assembly, comprising:

• an inner core free of open channels, comprising a base core layer comprising planar top and bottom surfaces, a transition support layer comprising planar top and bottom surfaces disposed on the top surface of the base core layer, and a cover layer comprising planar top and bottom surfaces disposed on the transition support layer, wherein the transition support layer comprises a viscoelastic foam having a density of about 3 pounds per cubic foot and a hardness less than about 15 pounds-force;
• and
• configured to contact only sidewalls of the inner core, disposed about a perimeter of the inner core, wherein the multilayered side rail assembly comprises a base rail layer comprising planar top and bottom surfaces disposed adjacent to the base core layer, a middle rail layer comprising planar top and bottom surfaces disposed on the top surface of the base rail layer, and a top rail layer comprising planar top and bottom surfaces disposed on a top surface of the middle rail layer, wherein the middle rail layer comprises a polyurethane foam comprising an open cellular structure, wherein the open cellular structure comprises about 10 to about 40 cells per inch, a hardness of about 35 pounds-force to about 100 pounds-force, and a density of about 1.2 pounds per cubic foot to about 2.0 pounds per cubic foot, and wherein a percentage of intact windows between adjacent cells in the open cellular structure is less than about 50%, and wherein the base rail layer, the middle rail layer, and the top rail layer have equal widths, and
• wherein the middle rail layer is in fluid alignment with the transition support layer and is configured to permit the flow of fluid from and to the inner core through the side rail assembly.