Abstract: A seat arrangement which provides adjustable support has a wire frame structure (1) mounted in a seat in order to support the cushioning material of the seat. Side boundaries of the frame structure are provided by wire portions (2) that extend generally parallel to one another. A first cushion supporting wire element (13) extends transversely with respect to said frame structure (1) and is pivoted thereto about a transverse axis. A second cushion supporting wire element (10) is pivoted with respect to the first wire element (13) about a second axis transverse with respect to the frame structure (1) and actuating means (16,17) is provided for applying a force between the said two wire elements (10,13) to cause articulation thereof about said second axis with movement of the second wire element (10) relatively to the frame structure in a direction generally parallel to the side boundaries thereof (2). The contour of the cushion support provided by the wire frame structure (1) can thus be varied.