Hand-built frames with hand-finished upholstery.Kiln-dried engineered hardwood frame with mortise & tenon joinery.Plastic shadowline support legs in an Espresso finish (removable).High-gauge sinuous spring and webbed cushion support.Cushions have fiber-wrapped, high-resiliency polyurethane foam cores.Seat firmness: Medium. On a scale from 1 to 5 (5 being firmest), we rate it a 3.Chaise lifts up via gas-lift mechanism to reveal storage space.Trundle pulls out from sofa and lifts up via elastic strap to create a Queen-sized sleeping area.To avoid damaging the frame, do not fold the cushion into the sofa with sheets or blankets on it.Reversible cushions with zip-off covers (chaise seat cushion is not reversible).Chaise seat cushion features a top seam.