Corner-blocked frame Loose seat cushion; attached back High-quality foam cushions wrapped in poly fiber Throw pillows included Pillows with feather-fiber blend Polyester upholstery 360-degree swivel Platform foundation system resists sagging 3x better than spring system after 20,000 testing cycles by providing more even support Smooth platform foundation maintains tight, wrinkle-free look without dips or sags that can occur over time with sinuous spring foundations