® A foldable, lightweight, principally metal chair or ottoman has a pair of spaced apart side frames (10) with front and rear legs (11, 12) connected by an upper arm (13). The seat comprising a pair of fore to aft extending seat side rails (17), each lying within the vertical plane of one of the side frames, and connected together by a flexible material seat web (5) is supported for folding movement by a pair of vertically inclined cross frames (25, 26) pivotally connected generally intermediate their ends and fixed at their upper ends to the seat side rails (17). Each cross frame (25, 26) is pivotally connected to a side frame (10) near the lower end thereof, and caps (C) on the seat side rails (17) have forwardly and rearwardly extending extensions (23) which project beyond the seat rails (17) to engage the inboard sides of the front and rear legs (11, 12) of the side frames (10) when the furniture unit is unfolded to spread position to react to the weight of a seat occupant and bear against the legs to maintain them in spread apart position.