The cover accommodate most standard-sized sofas, it is designed with excess fabric for tucking to allow the cover to stay in place when sat on, no more slipping and constant tucking. One piece construction has elastic corners, no more ties and a better fit, crafted from stretchy polyester and spandex, it can easily mold around the shape and arms of the sofa for a better fit. Dressing your sofa up with an elegant and fashionable sofa, adding subtle beauty to your space, keeping your sofa from dust, spills, dirt and insects which will ruin your sofa, the cover also extends your furnitures useable life. Strong elasticity and breathable, environmental and healthy material, all of our sofa covers are done by Anti-mite process, they are good to your health. Sofa slipcovers can be washed, it is reusable and environmental. Use the highest point on the back, the longest distance between the outside edges of the 2 arms, and the deepest depth from the back of the couch to the front. Be sure to allow some extra room for tucking the slipcover so the fit can be snug.