A mattress and a method of adjusting the pressure of a mattress are provided. The haptic effect is modified dynamically based on both the gesture signal and the real or virtual device sensor signal such as from an accelerometer or gyroscope, or by a signal created from processing data such as still images, video or sound. The chamber is then cooled to freeze the solution at a controlled rate, resulting in a matrix with a desired and uniform thickness having symmetric and uniform reticulations. The channel has a tubular inside sidewall surface, substantially no portion of which is a metal surface. Bottom ends 18a of the rising flaps 18 are bonded to the top sheet 11 corresponding to the water absorbent resin powder non-existing regions 15b-1 and 15b-2 located on both lateral ends of the sheet-like water absorbent layer 15, respectively. The stabilizing layers may include metallic titanium or a titanium alloy.