Round Down/Feather Seat Cushions - Enter the dimensions in inches and the type of down & feather below. Seat Cushion with EXTRA fill so that it has extra support to allow you to seat on it and avoid feeling the bottom support. Remember that down & feather seats are not flat , they have a bulge towards the center ( this bulge is called a “crown”) so if you are having new cases made for you seat cushions be sure to remember to add 1” to 2” to the fabric to allow for the crowning. If you want the cushion insert to fill out the case well add an inch to the diameter (distance accross A) case size when ordering the cushion insert.