"Left-arm" and "right-arm" describes the position of the arm when you face the piece Polyester chenille upholstery and pillows Reversible loose seat cushions and back cushions High-resiliency foam cushions wrapped in thick poly fiber Corner-blocked frame 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 Exposed feet with faux wood finish 4 accent pillows included