This cushion is my design and was custom made by my upholsterer to fit the dimensions of the existing built-in base.

This very old style of rolled edge, tufted mattress or "cushion" is known as a French tufted mattress and can be found at Restoration Hardware, Pottery Barn and many online sources.

Hello Melynda, if you look online under ‘French style mattress’ there may be a list of retailers in your area, or perhaps an upholsterer who could custom the cushion for you. Alternatively you could look up ‘Japanese floor cushions’ to find styles similar to the French cushions. Hope this helps.