Abstract: A folding sling chair is provided in which members of the chair frame incorporate internally mounted hinges, preferably invisible hinges. When an invisible hinge is in a neutral or stop position, only a seam or dividing line is visible; the internally mounted hinge structure is invisible. In operation, the hinge structure of the invisible hinge is less likely to interfere with a pliable fabric sling than in conventional designs. For example, the side rails of a seat of a folding sling chair may fold at invisible hinges mounted internally within the side rails, which can be angled to create an adjustable backrest. Various other applications of the present invention include angled and adjustable foot rests, head rests, chaise lounge arrangements, folding task chairs, etc.