When you ’re shopping for a sofa , you might come across specifications like “high-resilience polyurethane foam 30 kg/m³” or “40 kg/m³ with padding.” At first glance, this sounds pretty technical—but these specifications are exactly what tell you how high-quality and durable your sofa really is.
What is high-resilience foam?
HR (High Resilience) foam is a high-quality upholstery foam that’s more elastic and durable than standard foam. It conforms better to your body, retains its shape longer, and ensures that your sofa doesn’t look “sag” after just a short time.
The density specifications—30, 35, or 40 kg/m³?
This number indicates how much material is contained in one cubic meter of foam—in other words, the density. This has less to do with firmness and more to do with durability and shape retention.
30 kg/m³ → solid standard, suitable for normal use.
35 kg/m³ → significantly more durable, offers better comfort.
40 kg/m³ → premium quality, very sturdy, retains its shape even after many years.
In short: The higher the density, the longer you’ll enjoy your sofa .
Padding for extra comfort
If “300 g/m² wadding” is also listed, it means there’s a layer of wadding on top of the foam. It makes the seat softer and cozier while also ensuring that the upholstery looks nice and even.
Does the density tell you anything about the firmness?
No. The firmness (i.e.,
whether the seat feels soft or firm) is determined by a different value—the so-called compression firmness. So twosofaswith a density of 35 kg/m³ can feel different. Density tells you a lot about quality and durability.
Bottom line
: If you’relooking for asofawhere you’ll want to sit comfortably for many years, be sure to pay attention to the foam density. 35 or 40 kg/m³ are ideal for long-term enjoyment. And if you prefer a soft, inviting feel, a model with extra padding is just right for you.
