Material guide

How to choose a sofa that will not sag

“Sinks in the middle, curls at the edges after two years”—the root cause is filling and frame, not the leather.

Foam density

Seat foam density should be ≥ 45 kg/m³ (high resilience). Below 35 it feels soft at first and collapses within months. Back cushions may be softer; seat cushions must be firm.

Some sellers bulk up low-density foam with thick fabric to hold the shape—the truth appears three months after delivery.

Frame

Solid wood frames (pine, birch) outperform nailed multi-layer board. Reach into the gap between seat and backrest and feel down: a row of hard metal strips means serpentine springs; only elastic webbing means a cost-cutting build that will sag.

Filling combinations

Higher-end sets use high-resilience foam plus a down or latex layer—good rebound, hard to flatten. Pure low-density foam or recycled cotton is cheap but short-lived.

The on-site test

Press the center of the seat hard: it should rebound within 3 seconds with no permanent dent. Flip the sofa and check the bottom board—thin black non-woven fabric weathers away in about two years.

What the price gap is

A top-grain cowhide sofa set leaves the factory at about RMB 6,800 while showrooms sticker it above RMB 15,000—the difference sits in foam, frame and leather, visible to the eye.

About Yijian

We have worked in Foshan furniture for 19 years and know 200+ source factories in the Lecong–Longjiang belt personally. Fixed fee of RMB 800 per day (about US$110, Oct 2026), no commissions, your money never passes through us. How the service works →

Common questions

What foam density should a sofa seat have?

Aim for ≥45 kg/m³ high-resilience foam; below 35 kg/m³ it sags quickly.

How do I judge a sofa frame?

Feel inside the seat-back gap for serpentine springs plus a solid wood frame—elastic webbing alone means cost cutting.

Are down-filled sofas worth buying?

High-resilience foam plus down or latex feels great and resists flattening, but costs more and needs moisture care.

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