This is a great cover for my microfiber, deep-seated, t-cushion couch. I needed a cover to ensure ability to clean up spills and keep the couch clean with low maintenance. My couch measures 86" from the outsides of the arms yet the cover fits perfectly: snug enough to keep the shape of the couch, without being so tight that I have issues getting it off and on. It would definitely work for either a t-cushion or a box-cushion couch.