Extra wide injection molded seat with an interlocking hinge for greater structural support. Folds down easily. Shell with snap-on cushions with high quality upholstery for all day comfort. T-nuts installed into the seat for better mounting durability. Universal mounting pattern: 5″ x 5″. Dimensions: 18″ H x 20″ W x 17″ D. Gray shell with charcoal/gray cushion.