A mattress having variable height and hardness is disclosed. The mattress comprises a base layer held by a mattress cover using an extendable attachment system. The mattress further comprises one or more top layers made of resilient material which are stacked on top of the base layer. Only friction between the material of the top layers limit the lateral or longitudinal movements of a layer with regard to another layer.

A seat back of a seat includes: a seat back frame; a front side elastic member positioned on a user side; a rear side elastic member disposed more rearward than the front side elastic member is; and a pressure receiving member disposed at a rear of the rear side elastic member. The rear side elastic member has a lower resilience than the front side elastic member. The pressure receiving member supports the front side elastic member and the rear side elastic member while being supported by the seat back frame.

A bed apparatus capable of automatically adjusting a bed surface based on a sleeping position is disclosed. The bed apparatus includes a multi-layer bed body including an upper layer and a lower layer, material of the upper layer being softer than the material of lower layer; a shoulder airbag fixedly embedded in the upper layer and supported by the lower layer; a waist airbag movably disposed on the upper layer; a sleeping position sensing unit generating a sensing signal in response to the sleeping position of a user; a control box receiving the sensing signal, and determining the sleeping position of the user based on the sensing signal, and controlling the shoulder airbag or the waist airbag to inflate or deflate, responsively.

A mattress comprising a first layer comprising at least one trench extending laterally from a first side of the layer to an opposite side of the layer; a plurality of support members disposed in each trench; and a second layer disposed over at least the at least one trench. Another mattress comprising a first layer comprising at least one channel extending laterally from a first side of the layer to an opposite side of the layer; a plurality of support members disposed in each channel; and a second layer encompassing the first layer. A mattress assembly comprising one of the mattresses and a mattress foundation.

A mattress comprising a first layer comprising at least one channel extending laterally from a first side of the layer to an opposite side of the layer, and a plurality of tubular foam springs disposed in each channel. A mattress assembly comprising the mattress and a mattress foundation.

A mattress comprising a first layer comprising at least one channel extending laterally from a first side of the layer to an opposite side of the layer, and a plurality of foam spheres or hemispheres disposed in each channel. A mattress assembly comprising the mattress and a mattress foundation.

A mattress comprising at least one support layer comprising at least one non-linear channel extending laterally from a first side to an opposite side, and a plurality of support members disposed in the channel. The mattress may comprise a comfort layer, such as a viscoelastic foam layer, above the support layer. A mattress assembly comprising the mattress and a mattress foundation.

A mattress includes a foam layer positioned over a platform including a bladder having top and bottom surface joined by threads such that upon inflation the platform stiffens due to strain locking. The foam layer may include an upper layer and a lower layer that is firmer than the upper layer. The foam layer may include a polyurethane foam, such as memory foam. Zipper portions on the edges of the platform may secure to zipper portions on edges of the foam layer. Feet removably mount to a lower surface of the platform, which may include protrusions or straps for securing to the feet. The platform layer may be deflated and rolled with the foam layer for transport and storage.

A mattress that efficiently provides low pressure and alignment to achieve restful and less fragmented sleep. The mattress supports a recumbent body. The mattress comprises a composite and a cover encapsulating the composite. The composite includes a performance layer and a core layer. The performance layer includes a shoulder section, a thoracic section and a hip section for location at different longitudinal positions corresponding to the shoulder region, the thoracic region and the hip region of the recumbent body. The shoulder section, the thoracic section and the hip section have different displacement parameters to match the body displacements in the shoulder region, the thoracic region, and the hip region for alignment of the body with low body pressure. A core layer supports the performance layer.

An adjustable mattress topper assembly disposed in a cover is disclosed. The topper assembly may have one or two inflatable multi-valve bladder assemblies filled with foam; the topper assembly may be disposed in a topper body of foam. A hand-trigger may be used to operate a valve and inflate and deflate the bladder assembly, which may be located below the lumbar of a supine user.