A chair comprising: a main transom, a recline mechanism, and a seat portion; and a back portion comprising a frame having at least two spaced apart side members (S1, S2), each side member (S1,S2) having an inner edge and an outer edge, wherein the inner edges of the side members (S1,S2) face towards each other and the outer edges of the side members (S1,S2) face away from each other, each side member (S1,S2) being generally L-shaped in cross-section and having a main frame portion comprising a front face that faces a seated occupant in use, and a flange positioned at an edge of the side member (S1,S2), the flange extending at least a major portion of the length of the side member (S1,S2) and in a direction generally rearwardly from the front face of the main frame portion, wherein each flange is positioned at the outer edge of the respective side member (S1,S2), and wherein the flanges are arranged to resist a majority of the loading applied to the frame by a seated occupant, the frame further comprising at least one support member (45a, 45b) extending from a lower portion thereof and mounted to at least one of the main transom, the recline mechanism, and the seat portion, to support the back portion in the chair, and wherein the frame further comprises an upper transverse member at an upper portion thereof and a lower transverse member at the lower portion thereof, the upper transverse member being positioned a greater vertical distance from the seat portion than the lower transverse member, wherein the side members (S1, S2) extend between and are connected to the upper transverse member and to the lower transverse member with the upper and lower transverse members (43,33) extending between the two side members (S1,S2); and a compliant support surface extending between and supported by the side members (S1,S2). a main transom, a recline mechanism, and a seat portion; and a back portion comprising a frame having at least two spaced apart side members (S1, S2), each side member (S1,S2) having an inner edge and an outer edge, wherein the inner edges of the side members (S1,S2) face towards each other and the outer edges of the side members (S1,S2) face away from each other, each side member (S1,S2) being generally L-shaped in cross-section and having a main frame portion comprising a front face that faces a seated occupant in use, and a flange positioned at an edge of the side member (S1,S2), the flange extending at least a major portion of the length of the side member (S1,S2) and in a direction generally rearwardly from the front face of the main frame portion, wherein each flange is positioned at the outer edge of the respective side member (S1,S2), and wherein the flanges are arranged to resist a majority of the loading applied to the frame by a seated occupant, the frame further comprising at least one support member (45a, 45b) extending from a lower portion thereof and mounted to at least one of the main transom, the recline mechanism, and the seat portion, to support the back portion in the chair, and wherein the frame further comprises an upper transverse member at an upper portion thereof and a lower transverse member at the lower portion thereof, the upper transverse member being positioned a greater vertical distance from the seat portion than the lower transverse member, wherein the side members (S1, S2) extend between and are connected to the upper transverse member and to the lower transverse member with the upper and lower transverse members (43,33) extending between the two side members (S1,S2); and a compliant support surface extending between and supported by the side members (S1,S2).