Engineered hardwood frame with mortise & tenon joinery. All wood is kiln-dried for added durability. Lumbar pillows and throw pillows included. High-gauge sinuous springs provide cushion support. Seat cushions: Fiber-wrapped high-density polyurethane foam. Handcrafted. Seat firmness: Soft. On a scale from 1 to 5 (5 being firmest), it's a 1. Back cushions: 50% polyester fiber, 45% duck feather and 5% duck down in down-proof ticking. Pieces are fully upholstered and may stand alone. 1-Arm Chair is the same size as the Corner and can be used on left or right side; pillows can be switched and hardware can be removed. Sectional pieces attach via alligator clips (included). Cushions are reversible. Make sure it fits! See our guide on measuring for delivery. Assembled in the USA.