Abstract: A self-ventilating and self-cooling variable geometry pillow comprising a middle module comprising a core composed of an open-cell shape memory material and a cores-envelope that surrounds the core; a first outer module connected to the middle module, the first outer module comprising a core composed of an open-cell shape memory material and a cores-envelope that surrounds the core; a second outer module connected to the middle module, the second outer module comprising a core composed of an open-cell shape memory material and a cores-envelope that surrounds the core; a first articulation crease that allows the first outer module to rotate with respect to the middle module; and a second articulation crease that allows the second outer module to rotate with respect to the middle module. The pillow's variable geometry accommodates various types of sleepers.