Seat back and insert

摘要: A seat back 1 comprises a rear wall (2, figure 1A) bordered by side walls (3a, 3b, projecting forward from the wall. An insert 5 for supporting of person, is disposed at least partially in cavity (4, defined front and between opposing surfaces walls. The are shaped to restrict downward movement towards base (e.g. forming geometric lock, requiring no mechanical fasteners or connectors). Preferably recesses 7a, 7b facing surface 9a, 9b perimeter (3, engaging lateral tabs protrusions 8a, 8b insert. may taper. Preferably, curved recess 10 its bottom edge not filled insert, e.g. accommodating (11, 3). be resiliently deformable, made foam. row vehicle seats, aircraft seats comprising disclosed.