An adjustable foundation and process includes a mattress support surface including a head/back section hingedly connected to an intermediate section at one end and a leg/foot section hingedly connected to the intermediate section at another end, wherein the intermediate section includes a first second portions, wherein the first portion is hingedly connected to the head/back section and the second portion is hingedly connected to the leg/foot section. The intermediate section is configured to increase in length upon articulation of the head/back section and/or the leg/foot section from a flat position or an increase in inclination of any section. Likewise, the intermediate section is configured to decrease in length upon articulation of the head/back section and/or the leg/ foot section from an inclined position to a flat position or a decrease in length upon declination of any section.
