A comfort system for a seat, in particular for vehicle and aircraft passenger seats mounted one behind the other in a row, has at least one support component (1) movable from a non-use position to a use position. Foot and leg components (3, 5) of a seat occupant rest on at least one support surface. The support component (1) is held in the use position by a fastening mechanism (15) and extends at least in part into a foot space which may be used by the occupant of the rear seat of two seats mounted in a row. The support component (1) clears the foot space when the component is in the non-use position and is essentially flexible. When in the use position, the fastening mechanism (15) at least in part follows a curved path, and is mounted on the front seat of two seats mounted in a row.