Essential for extended and efficient performance Roadster thrones feature advanced ergonomic design and a selection of computer-tempered cushion tops to provide support and ease joint pressure during long sessions. The D1500 features a donut-shaped Multi-Core Foam cushion with multiple layers of varied density foam for better playing and improved feel and its durable tripod includes 's exclusive Lock/Spin System allowing the cushion to be secured in place or free spinning depending on preference.