A foam core mattress including a cushion layer having a foam with an IFD of between about 6 to about 18 and a density of between about 1.5 lb./ft.sup.3 to about 4 lb./ft.sup.3. The mattress includes a core that is coupled with a bottom surface of the cushion layer. The core includes a matrix of rebond foam pieces that includes at least 5% foam pieces having volumes of less than about 0.5 in.sup.3, at least 40% foam pieces having volumes of between about 0.5 and 2.0 in.sup.3, and at least 20% foam pieces having volumes of greater than 2.0 in.sup.3, wherein the core has an IFD of between about 21 and 36. The mattress includes a base layer coupled with a bottom surface of the core. The base layer has an IFD of between about 28 to about 70 and a density of between 1.5 lb./ft.sup.3 to about 2 lb./ft.sup.3.

A configurable foam mattress comfort system includes a firm foam mattress foundation including an upper surface having a triangular grooves disposed across a width thereof, and foam elongate cells configured to fit partially within corresponding triangular grooves from among the triangular grooves disposed across the width thereof. A length of each of the foam elongate cells is substantially equal to the width of the firm foam mattress foundation. The foam elongate cells are configured to be custom-stacked on each other and on the firm foam mattress foundation in accordance with a user's desired comfort configuration.

In a seat pad 10, a high ventilation member 12 higher in ventilation property than a seat pad member forming the seat pad 10 is embedded in a state of being exposed only to a rear side of the seat pad. The high ventilation member 12 is polyurethane foam subjected to membrane removal treatment, the polyurethane foam subjected to membrane removal treatment having a density of 20 kg/m.sup.3 to 40 kg/m.sup.3 and a number of cells of 45 cells or less per 25 mm.

A layered cushion that may be fully disassembled for easy cleaning is disclosed herein. The sleep system is durable and fire retardant. The layered cushion may include a foam layer, a layer of void cells, and a cover. The foam permits fluids to move freely there through and contours to a user's body to maximize comfort and reduce interface pressure. The reticulated foam layer resists compression set and thermosetting. The layer of void cells also permits fluids to move freely there through and provide additional support to the user's body. The individual void cells of the void cell layer are perforated to allow the transmission of fluids there through. The cover couples the other layers together to form the layered cushion and prevents the layers from deteriorating. The cover is removable to permit cleaning each of the layers independently.

A reversible mattress includes a first outer region and a core region placed beneath the first outer region. The core region includes at least one core portion. The reversible mattress further includes a second outer region placed beneath the core region. The first outer region, the core region, and the second outer region are each made of latex foam and form the reversible mattress. The first outer region has a first outer ILD (ILD.sub.T1) and the second outer region has a second outer ILD (ILD.sub.T2) such that the first outer ILD (ILD.sub.T1) is lower than the second outer ILD (ILD.sub.T2).

A symmetrical zoned foam mattress includes an upper foam layer with a wavy lower side and a lower foam layer with a wavy upper side. The lower layer has top, middle and bottom lateral valleys. The wavy lower side of the upper layer is glued to the wavy upper side of the lower layer. The top lateral valley has a minimum located within eighteen inches of the top head end of the lower layer. The bottom lateral valley has a minimum located within eighteen inches of the bottom foot end of the lower layer. A center plane intersects the lower foam layer at a minimum of the middle lateral valley. The minimum of each of the top and bottom lateral valleys is about fifteen inches from the end of the mattress regardless of whether the consumer chooses to use the top or bottom end as the head of the mattress.

A modular sleep apparatus that enables customization of a conventional mattress. The modular sleep apparatus includes a customizable mattress pad casing having pockets into which various inserts may be placed. The more the number of pockets, the greater customization the mattress pad allows. The inserts themselves can be of varying thickness, firmness, and material. In some embodiments, the inserts may also be placed directly over a conventional mattress and held in place with a fitted sheet. In other embodiments, the inserts are placed directly into pockets or envelopes in the top layer of a mattress. In other embodiments, the mattress pad casing is pre-assembled with inserts.

A mattress includes a first, phase changeable component and a thermal management system adapted to control the temperature of the phase changeable component in order to change the firmness of the mattress. In one embodiment the phase changeable component includes two dimensional lattices separated from each other and a spring element extending between the lattices. Some embodiments of the mattress include an optional single phase component. The firmness can be made spatially and/or temporally uniform or nonuniform, and can be controlled based on one or more sensed parameters.

Modular mattress systems and methods are described. For example, a modular mattress can include a fabric cover configured to surround at least two foam layers. The fabric cover can include an opening to allow access to an interior region of the fabric cover. The mattress can include a first foam layer positioned within the interior region of the fabric cover, and an encasement layer positioned below the first foam layer. The encasement layer can include a recess configured to receive one or more modular support sections. The mattress can also include a plurality of modular support components received within the recess of the encasement.

A configurable foam mattress comfort system includes a firm foam mattress foundation including an upper surface having a triangular grooves disposed across a width thereof, and foam elongate cells configured to fit partially within corresponding triangular grooves from among the triangular grooves disposed across the width thereof. A length of each of the foam elongate cells is substantially equal to the width of the firm foam mattress foundation. The foam elongate cells are configured to be custom-stacked on each other and on the firm foam mattress foundation in accordance with a user's desired comfort configuration.