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25 May

What is HR foam and is it worth having in a sofa or mattress?

 

HR foam (from High Resilience) is a type of polyurethane foam with a density ranging from 35 to 55 kg/m³ that quickly returns to its original shape after you get up. In upholstered furniture, it’s considered one of the more durable options a sofa with HR foam should keep its shape for 8-10 years of daily use.

That’s the short answer. If you want to know more how it differs from standard T foam, when paying extra makes sense, and when it doesn’t - keep reading.

How to recognize HR foam

You won’t see it with the naked eye because it sits under the upholstery. But there are three ways to identify it:

Check the manufacturer’s description. In the product specification, look for the “HR” label together with a number, for example HR 35, HR 40, HR 45. The number indicates density in kg/m³. The higher it is, the heavier and more durable the foam becomes (but also more expensive).

By touch. Sit on the sofa and stand up. HR foam returns to shape within 1-2 seconds without leaving any visible imprint. If the indentation stays longer, it’s not HR it’s standard T foam (regular polyurethane foam) or memory foam.

By weight. A sofa with proper HR foam is simply heavier than a sofa of the same size made with cheap T foam. If you can lift a two-seater sofa with one hand, there’s probably some cost-cutting inside.

Where does the “high resilience” come from?

Standard polyurethane foam (marked as T15, T25, T30) has cells with a fairly regular structure inside. HR foam has cells with an irregular, “torn” structure, and these are responsible for its ability to bounce back into shape. Imagine the difference between a kitchen sponge (you squeeze it and the dent remains) and an exercise ball (you squeeze it and it bounces back). HR is much closer to that ball.

Pros and cons without the sales pitch

What you get:

  • A sofa that doesn’t look like a hammock after 3 years
  • Stable support - you don’t sink into it like a bean bag
  • Better airflow than memory foam (less sweating in summer)
  • Realistically 8-10 years of seat life with daily use

What you don’t get:

  • The “body-hugging” feeling of memory foam HR is resilient, not pressure-soft
  • The lowest price - a sofa with HR 40 will cost 15-30% more than an identical one with T25 foam
  • A miracle if the rest of the construction is poor. HR foam on 10 mm plywood and standard elastic webbing won’t last very long

HR foam vs other foams - when to choose what

The most common comparisons people make before buying:

HR vs standard T foam (T25, T30). T foam is cheaper, but it wears out faster. On a sofa used daily, the difference becomes visible after a year or two. If you’re buying furniture for a guest room where someone sits once a week, T foam is enough. For a living room sofa where you watch movies every evening - HR.

HR vs memory foam. Memory foam adapts to the body under heat and pressure great for mattresses for people with back pain. HR doesn’t adapt; it supports. In sofas, memory foam can be too soft and tends to trap heat in summer, while HR is more versatile.

HR vs latex. Latex (natural or synthetic) is more durable than HR, but also 2-3 times more expensive and heavier. It’s rarely found in sofas and is more common in premium mattresses.

What HR density should you choose?

This is the question that actually matters:

  • HR 30–35 - the minimum level that realistically deserves the HR name. Good for occasional-use furniture, armchairs, and poufs.
  • HR 35–40 - the standard for mid-range sofas. The best choice for most people.
  • HR 40–50 - for sofas used daily by heavier people (over 90 kg) or families with children where furniture takes a beating.
  • HR 50+ - premium segment, mattresses, office seating, and contract furniture.

Watch out for a common marketing trick: some manufacturers write “HR foam” without stating the density. If there’s no number, it’s most likely HR 28–30 - the lower limit of what can even be called HR. Always ask for the exact density.

Is HR foam suitable for sleeping?

Yes, but with a caveat. In a sofa bed used for daily sleeping (for example in a studio apartment), HR 40+ should perform well for several years. For occasional sleeping - guests once a month HR 35 is enough. For sleeping as your main bed long-term, a dedicated mattress is a better option; in that case look toward high-resilience foams 50+, latex, or memory foam.

How to take care of HR foam so it lasts a decade

Three things:

  1. Rotate and flip the seat cushions every few weeks. If you always sit in the same spot, that area will wear out first.
  2. Don’t dry it in direct sunlight and don’t place wet items on the seat. UV exposure and moisture shorten the lifespan of polyurethane.
  3. Don’t jump on the sofa. Sounds obvious, but point impacts (kids, dogs) damage the cellular structure faster than regular sitting.

Most common questions about HR foam

Is HR foam safe for children and allergy sufferers?

Yes, polyurethane foam is chemically neutral after the production curing process. By itself, it does not cause allergies. Allergic reactions are more often triggered by upholstery fabric or protective treatments.

Does HR foam smell after unpacking?

New foam may have a mild smell for 2–7 days. That’s normal - simply ventilate the room. If the smell lasts longer than 2 weeks and is strong, it may indicate low-quality foam or improper curing.

Can you buy HR foam separately and replace it in your own sofa?

Yes. Most foam manufacturers sell custom-cut foam sheets. You need to measure the seat insert (length, width, thickness) and order HR foam with a density of 35-45 kg/m³. Depending on dimensions, the cost is usually around PLN 150-400 per seat cushion.

HR foam or Bonnell springs which is better for a sofa?

These are two different approaches. Bonnell springs create a firmer, more “bench-like” seating feel and are cheaper. HR foam is more resilient and distributes pressure better. More and more manufacturers combine both - Bonnell springs underneath and HR foam on top.