A piece of furniture or a textile element comprising a layer of sound-absorbing material and a layer of a material for shielding against magnetic and electromagnetic fields is described. The textile element may be a curtain comprising a first layer of sound-absorbing fabric and a second layer of EMI shielding material, wherein the first layer and the second layer are configured to be at least partially in contact with each other.

A seating configuration is described. The seating configuration includes a first support surface configured to support the Ischial Tuberosities of a user. The first support surface includes a feature to urge a user into an optimal position on the seat. The seating configuration includes a second support surface positioned adjacent a pelvic-sacral-lumbar region of the user. The seating configuration includes a third support surface positioned adjacent a thoracic-cervical region of the user. The first, second, and third support surfaces, respectively, together can be configured to create a natural alignment of a spinal column of the user.

A seating configuration is described. The seating configuration includes a first support surface configured to support the Ischial Tuberosities of a user. The first support surface includes a feature to urge a user into an optimal position on the seat. The seating configuration includes a second support surface positioned adjacent a pelvic-sacral-lumbar region of the user. The seating configuration includes a third support surface positioned adjacent a thoracic-cervical region of the user. The first, second, and third support surfaces, respectively, together can be configured to create a natural alignment of a spinal column of the user.

A pocketed spring assembly comprises a plurality of parallel strings of individually pocketed springs. A dimensionally stabilizing substrate is secured to at least some of the strings on one of the top and bottom surfaces of the strings. A scrim sheet is secured to at least some of the strings on an opposed surface of the strings to maintain the positions of the strings. The dimensionally stabilizing substrate is laterally rigid enough to maintain length and width dimensions of the coil spring assembly. However, the dimensionally stabilizing substrate is flexible enough to allow the pocketed spring assembly to be roll packed for shipping.

A pocketed spring assembly comprises a plurality of parallel strings of individually pocketed springs. A dimensionally stabilizing substrate is secured to at least some of the strings on one of the top and bottom surfaces of the strings. A scrim sheet is secured to at least some of the strings on an opposed surface of the strings to maintain the positions of the strings. The dimensionally stabilizing substrate is laterally rigid enough to maintain length and width dimensions of the coil spring assembly. However, the dimensionally stabilizing substrate is flexible enough to allow the pocketed spring assembly to be roll packed for shipping.

Disclosed is a supportive apparatus for a furniture item, the supportive apparatus comprising a first layer comprising a first polymeric foam material having a first density ranging from 30 kg/m.sup.3 to 60 kg/m.sup.3; a second layer disposed on the first layer, the second layer comprising a second polymeric foam material having a second density ranging from 60 kg/m.sup.3 to 90 kg/m.sup.3, wherein the second layer comprises a unitary layer of the second polymeric foam material. Further disclosed is a method for manufacturing the supportive apparatus, and a method of fitting the supportive apparatus on a furniture item.

Disclosed is a supportive apparatus for a furniture item, the supportive apparatus comprising a first layer comprising a first polymeric foam material having a first density ranging from 30 kg/m.sup.3 to 60 kg/m.sup.3; a second layer disposed on the first layer, the second layer comprising a second polymeric foam material having a second density ranging from 60 kg/m.sup.3 to 90 kg/m.sup.3, wherein the second layer comprises a unitary layer of the second polymeric foam material. Further disclosed is a method for manufacturing the supportive apparatus, and a method of fitting the supportive apparatus on a furniture item.

A stacking chair system comprising a frame with four legs, two being front legs and two being rear legs. The seat is secured to the frame, the seat being upholstered and including a foam cushion supported by flexible support. Two receivers in the frame are at a rear of the frame and between the rear legs of the frame. A backrest comprising a foam cushion is upholstered and has an inner frame supporting the foam cushion, the inner frame including two protrusions extending out of the upholstery wherein the each one of the two protrusions is configured to insert into one of the two receivers. A fastener is provided for each receiver and is configured to secure the protrusion to the corresponding receiver. The backrest is removable upon removal of the fasteners.

A stacking chair system comprising a frame with four legs, two being front legs and two being rear legs. The seat is secured to the frame, the seat being upholstered and including a foam cushion supported by flexible support. Two receivers in the frame are at a rear of the frame and between the rear legs of the frame. A backrest comprising a foam cushion is upholstered and has an inner frame supporting the foam cushion, the inner frame including two protrusions extending out of the upholstery wherein the each one of the two protrusions is configured to insert into one of the two receivers. A fastener is provided for each receiver and is configured to secure the protrusion to the corresponding receiver. The backrest is removable upon removal of the fasteners.

A range of radii from a bubble radius of 0 mm to a maximum bubble radius is divided into 20 radius sections r.sub.1 to r.sub.20. Bubble volume rates are calculated by dividing a product of the number of bubbles having a radius r and a volume of the bubbles having the radius r by a volume of all the bubbles, and the bubble volume rates are integrated for each radius section r.sub.n. Integrated values thus obtained are plotted on the respective radius sections r.sub.n, thereby obtaining a scatter diagram. A first approximate straight line obtained from plots of a first bubble group in the scatter diagram and a second approximate straight line obtained from plots of a second bubble group have different slopes. A sum of bubble volume rates of the bubbles forming the second bubble group ranges from 10% to 80% of a whole bubble volume rate.