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A seating shell comprises a seat having a plurality of arcuate slots formed therethrough to define a plurality of closely spaced webs extending and suspended between semi-rigid side borders of the seat. The widths of a substantial number of the webs, from front to back, progressively decrease to pro

A seating shell comprises a seat having a plurality of arcuate slots formed therethrough to define a plurality of closely spaced webs extending and suspended between semi-rigid side borders of the seat. The widths of a substantial number of the webs, from front to back, progressively decrease to provide varied degrees of flex and a gradual transition of such flex when a seating load is imposed on the seat. The seating shell may have a backrest integrally formed with the seat. The backrest also has a plurality of webs formed thereon to provide a flexible back support.

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A seating shell comprising: a seat, disposed on a central longitudinal axis thereof, having solid, semi-rigid and laterally spaced side borders extending in the direction of said axis and front and back borders extending transversely between said side borders to form a frame structure for said seat;

A seating shell comprising: a seat, disposed on a central longitudinal axis thereof, having solid, semi-rigid and laterally spaced side borders extending in the direction of said axis and front and back borders extending transversely between said side borders to form a frame structure for said seat; a plurality of elongated closely spaced arcuate slots, said slots having their lengths extending between and terminating at said side borders and being formed through said seat to define a plurality of closely spaced and flexible web means, each of said slots defining an arc of curvature that is concave when viewed from the front border of said seat, and each of said slots extending downwardly and rearwardly towards the back border of said seat at an acute angle, relative to a horizontal plane containing said axis, selected from the approximate range of from 30°to 60 °; and said web means having their lengths extending and attached in suspended relationship between said side borders, with at least a substantial number of said web means having varied widths for providing varied degrees of flex and a substantially uniform distribution of a seating load when such load is imposed on said seat.