A six-sided box-type cushion is described that has characteristics that not only offer targeted support for the user, but also allow the cushion to be reversible in that the user's perceived firmness is the same no matter which seating surface is facing up. In particular, the cushion has a first, second, third, and fourth faces, and a first and second seating surface. The cushion comprises a plurality of substantially coplanar firmness zones, each zone having a uniform firmness throughout, and the positioning of the firmness zones relative to each other creates a firmness gradient from the first face end to the second face end of the cushion. The first firmness zone at the first face end of the cushion is the most firm, the third firmness zone at the second face end of the cushion is the least firm, and the second one or more firmness zones are of intermediate firmness. The cushion is at least partially enveloped by a cushion cover layer, and may additionally include a seating surface cover layer on each of the first and second seating surfaces.