Glossary · Sofas & Sectionals
Sinuous Springs
Sinuous (no-sag) springs are continuous S-shaped steel wires running front-to-back under a sofa seat. They are the modern standard because they deliver durable, consistent support in slimmer frames at reasonable cost. Gauge and spacing decide quality: heavier wire, closer spacing, and clips that do not creak. Webbing-only suspensions are the budget tier below.
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