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: Fibre-wrapped high-density polyurethane foam.Seat firmness: Soft. On a scale from 1 to 5 (5 being firmest), it's a 1.Back cushions: 50% polyester fibre, 45% duck feather and 5% duck down in down-proof ticking.Loose, reversible cushions with zip-off covers.Sectional pieces attach via alligator clips (included).Modular pieces are easy to move and can be used standalone or added on to later.This contract-grade item is manufactured to meet the demands of commercial use in addition to residential