If you’re looking for quality suspension in your furniture there are three options that are found in quality furnishings.
Sinuous springs are steel wires often formed in s-shaped coils. These are attached to the fame with clips and other fasteners and usually are re-enforced with metal tie rods. These springs provide a solid no-sag foundation for your furniture and can provide good quality.
8-way hand-tied springs have been an industry standard for decades. It means quality and requires skilled craftsman many hours to make. The springs are tied in 8 different directions by skilled laborers who produce seating that is flexible, forgiving, and accommodating to individuals of all shapes and sizes.