According to the manufacturer, the Mattress Safe's FurnitureSafe Encasement - Curved Sectional Corner
is 82 inches in width. This means it will fit a total of 82 inches on your sofa. If your section is bigger than this, we would recommend speaking to the manufacturer directly for a special order item. It does have soft corner seams that will fit the curves of your sectional sofa. It is also a tuck and fit so if there is any extra fabric, you can tuck it into the pillows of the couch, etc.