Abstract: A chair assembly adapted to be nested with a second chair assembly identical to the chair assembly. The chair assembly comprises a seating portion and a back support. The seating portion includes a top seat surface, a bottom seat surface generally parallel to the top seat surface, a first side seat edge, a second side seat edge, and a front edge. The back support is generally perpendicular to the seating portion and includes an inner back support surface, an outer back support surface generally parallel to the inner back support surface, a first side back support edge, a second side back support edge, and a top back support edge. A first return flange disposed on the first side back support edge of the back support and a second return flange disposed on the second side back support edge of the back support. A first recess can be disposed on the inner surface of the back support, and is adapted to receive a first return flange of a second chair assembly nested with the unitary shell.