GOLS certified organic 100% Natural Dunlop Latex Foam is available in sizes up to 80 inches long. One important thing to keep in mind is that latex is a relatively heavy material compared to ’standard’ urethane cushion foam, and a single large sofa cushion could weigh 60-70 lbs, depending on size and thickness. This may not be too much of a concern once it’s in place on your sofa, but the weight could be an issue for those working with it and moving it around. See natural upholstery materials vendor resources here.