Abstract: A chair or the like having a frame comprised of spaced parallel rails between which a plurality of juxtapositioned rungs are adjustably displaced according to a prescription which determines a supporting contour for the seat or back of said chair. Several rungs are provided, and each with a distinct offset mounting by means of which a substantial selection of displacements are obtained for fixed positioning of the rungs, there being flexible cushioning overlying the rungs for determined support of a person seated thereon.