When evaluating leisure sofas, focus on the internal frame, padding, and upholstery. For the frame, prioritize kiln-dried solid wood (oak or larch) or reinforced steel to prevent warping and squeaking. The padding should feature high-resilience (HR) foam with a density of at least 35kg/m³ to ensure the seat retains its shape. For upholstery, if choosing leather, ensure it is top-grain leather; for fabric, look for a Martindale rub count of 20,000+ for residential use or 40,000+ for commercial high-traffic areas.