A sit and twist device includes a rotatable member and a cushion. The rotatable member has an upper member, a lower member, and a spinner positioned between the upper member and the lower member. The upper member is rotatable relative to the lower member. The cushion is coupled to an upper surface of the upper member. The upper member includes a plurality of downwardly extending stops and the lower member includes a plurality of upwardly extending stops. The stops abut one another when the spinning member is at the end of the range of rotation, which is less than 360 degrees.

A seat cushion assembly includes a base defining a leg support, a support portion recessed relative to the leg support, and a well recessed relative to the support portion, and an air pad assembly including a first air support member and a second air support member, the first air support member being positioned on the recessed support portion, and the second air support member being removably received by the well.

A seat cushion assembly includes a base defining a leg support, a support portion recessed relative to the leg support, and a well recessed relative to the support portion, and an air pad assembly including a first air support member and a second air support member, the first air support member being positioned on the recessed support portion, and the second air support member being removably received by the well.

A vehicle seat for commercial vehicles includes a support structure and at least one cushion element. The at least one cushion element is arranged on the support structure. The support structure includes at least one shell element. The at least one cushion element is formed from an integral foam and has a plurality of openings.

A vehicle seat for commercial vehicles includes a support structure and at least one cushion element. The at least one cushion element is arranged on the support structure. The support structure includes at least one shell element. The at least one cushion element is formed from an integral foam and has a plurality of openings.

A seat for supporting an occupant includes a cushion including a first portion having a first stiffness and a second portion having a second stiffness. The second portion having a matching and opposite contour as the first portion. The cushion is positionable on a seat bottom in a plurality of orientations relative to the seat bottom to provide varying comfort sensations to the occupant based on the orientation of the cushion relative to the seat bottom.

A seat for supporting an occupant includes a cushion including a first portion having a first stiffness and a second portion having a second stiffness. The second portion having a matching and opposite contour as the first portion. The cushion is positionable on a seat bottom in a plurality of orientations relative to the seat bottom to provide varying comfort sensations to the occupant based on the orientation of the cushion relative to the seat bottom.

A seat pad having a pad body made of a polyurethane foam molding, a ventilation passage extending along a pad back surface of the pad body, a duct member which is harder than the pad body forming an inner peripheral wall of the ventilation passage, and a back surface member provided along the pad back surface. The duct member and the back surface member are integrally foam-molded with the pad body. The back surface member has an overlapping portion which is not provided on a bottom surface of the ventilation passage but is provided so as to overlap the duct member in the direction perpendicular to the plane in a non-bottom area outside the bottom surface.

A seat pad having a pad body made of a polyurethane foam molding, a ventilation passage extending along a pad back surface of the pad body, a duct member which is harder than the pad body forming an inner peripheral wall of the ventilation passage, and a back surface member provided along the pad back surface. The duct member and the back surface member are integrally foam-molded with the pad body. The back surface member has an overlapping portion which is not provided on a bottom surface of the ventilation passage but is provided so as to overlap the duct member in the direction perpendicular to the plane in a non-bottom area outside the bottom surface.

An upholstered seat, a frame including a pair blow molded hollow arm rest forms. Further components may be blow molded such as a back rest. The arm rest forms and backrest forms may be reinforced with metal plates and assembled into a recliner. Form fit upholstery coverings with closures on the blow molded components. The backrest form may have legs with kd brackets secured thereto by clamping onto the portions of the legs of the backrest forms. The connections to the backrest form and arm rest forms providing a geometrically rigid and robust frame that is weighs less, is quicker to assemble, and is more robust.