Garden cushions add comfort to any garden chairs or lie-on lounges. They can also be stand-alone, or better, sit-alone, items, that you can place on the grass or the tile or concrete for picnics or just sitting about.
Garden cushions are tougher and more water-resistant than indoor cushions need to be. Otherwise, a cushion is a colourful, soft, and nice barrier between yourself and the hard, cold ground. Put garden cushions on the furniture for a nicer feel.