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Are foam mattresses healthy? Discover facts and myths!

5 maja 2025
Healthy sleep is one of the pillars of human functioning, and its quality largely depends on the mattress and pillow. Foam mattresses have been gaining popularity for years, but many myths have grown up around them. So, can the foam in a mattress really be healthy?

In an era of growing consumer awareness, it’s worth basing purchase decisions on facts. It’s definitely smart to ignore trends when your health is at stake. A foam mattress can be both the healthiest solution and a choice you might regret. It all depends on the mattress design—including the properties of the foams.

HR foams – a healthy foundation for good sleep

The HR foams we use (high resilience) are regarded as some of the most advanced yet safest materials for making mattresses. They feature an open‑cell structure that lets air flow freely inside the mattress. Because of this, the foam breathes, which reduces the risk of mould and bacterial growth as well as other microorganisms. In practice, that means better sleeping conditions, especially for allergy sufferers.

What’s more, HR foams offer excellent spinal support. They’re flexible, yet don’t sag under body weight the way classic T‑foams do. Since they come in a range of firmness and density levels, a mattress can be precisely matched to the user’s needs. On this very basis, the Osaka Air mattress—considered by many the best—was created.

Another advantage of HR foams is their durability. They don’t crack and don’t deform; their physical properties last for a long time. That’s crucial for maintaining health, because they provide stable support for the spine. HR foams are therefore the foundation of a mattress that delivers ergonomics and health.

Visco foam – only in the second layer

In turn, memory foam, that is V foam (eng. viscoelastic), shot to fame as a material that supposedly perfectly conforms to body shape—which isn’t entirely true. Its properties are indeed impressive, because it responds to heat and sinks in, reducing pressure at contact points. But you can benefit from those advantages only when it’s properly used in a mattress, meaning it belongs in the second layer.

Using viscoelastic foam as the top layer leads to serious problems. First, the material heats up easily, which can cause the body to overheat during sleep. In addition, this foam restricts ventilation, which encourages moisture build‑up.

In the design of the Osaka Air mattress, we used V50075 viscoelastic foam, but exactly in the second layer, beneath the high‑resilience foam. Thanks to that, the sleeper gets what’s best about memory foam—comfort and contouring—without the side effects. We created this well‑thought‑out solution in line with ergonomics and physiology, not fashion.

T foams – apparent savings, real problems

The HR foams we use (high resilience) are regarded as some of the most advanced yet safest materials for making mattresses. They feature an open‑cell structure that lets air flow freely inside the mattress. Because of this, the foam breathes, which reduces the risk of mould and bacterial growth as well as other microorganisms. In practice, that means better sleeping conditions, especially for allergy sufferers.

What’s more, HR foams offer excellent spinal support. They’re flexible, yet don’t sag under body weight the way classic T‑foams do. Since they come in a range of firmness and density levels, a mattress can be precisely matched to the user’s needs. On this very basis, the Osaka Air mattress—considered by many the best—was created.

Another advantage of HR foams is their durability. They don’t crack and don’t deform; their physical properties last for a long time. That’s crucial for maintaining health, because they provide stable support for the spine. HR foams are therefore the foundation of a mattress that delivers ergonomics and health.

European standards for foams

The European market is overseen by the European Chemicals Agency (ECHA), which makes sure that strict safety standards are met. Certificates such as CertiPUR, OEKO‑TEX and ISO confirm that the materials contain no harmful substances, including heavy metals or volatile organic compounds you’d rather avoid. That’s great news for consumers, because at least chemically speaking most foams in Europe are safe.

Still, a truly healthy mattress is more than the absence of toxic ingredients. It also means thought‑out construction, i.e. matching firmness to sleeping position. That requires the proper arrangement of foam layers with specific parameters. Many cheap mattresses may therefore meet chemical standards yet provide no ergonomic support—and so fail their basic purpose, often harming your health.

When choosing a mattress, the key isn’t only whether it carries certificates, but above all the mattress design that drives its functionality. ONSEN® relies on knowledge of ergonomics and biomechanics to create unique products that are not just non‑toxic but first and foremost support health and comfort at a physiological level.

Foam mattresses can certainly be healthy—provided they’re designed wisely. HR foams guarantee durability and ergonomic support thanks to their structure. Visco foam in the second layer delivers comfort and pressure relief that the first layer can’t provide. Cheap T foams, by contrast, are best avoided. European certificates ensure safety, but the most important thing is a well‑designed layer system like the one inside the Osaka Air mattress.

ONSEN® offers solutions that are safe and comfortable, but above all functionally well‑thought‑out. It’s not about fashion, but rather solid knowledge and real benefits for your health, comfort and peace of mind.

We also encourage you to explore other articles on the best sleep and health blog, as well as the Encyclopedia of Healthy Sleep prepared by the ONSEN® team of specialists. For those who care about spine health, we recommend a set of spine exercises prepared by our physiotherapist.

FAQ: The impact of foam mattresses on health

Is a foam mattress healthy?

Yes?provided it?s smartly engineered. Premium HR (high?resilience) foams ensure breathability, durability, and stable spinal support, while memory foam delivers genuine comfort only when it sits in the second layer rather than directly under your body. Cheap, low?density T?grade foams are a recipe for back pain and a quickly deformed mattress. In short, not all foams are equal, and your health depends on the quality and layout of the layers.

Is the foam inside a mattress toxic?

In Europe, foam materials are regulated by the ECHA, and certificates such as CertiPUR,?OEKO?TEX, and ISO confirm the absence of heavy metals and harmful VOCs. If a mattress meets these standards, toxins aren?t a concern. Chemical safety alone, however, isn?t the whole story.

Are foam mattresses bad for your spine?

Generally, a good foam mattress is the best choice for spinal health. HR foams, thanks to their elasticity and resistance to sagging, keep the spine?s natural curve and don?t flatten over time. Memory foam in the second layer relieves pressure points without overheating the body. The real risk comes from cheap T?foams, which crack, crumble, and collapse?forcing your spine into an unnatural position. The key is matching the mattress?s firmness and density to your needs.

What do chiropractors say about foam mattresses?

Many chiropractors recommend them, citing ergonomics and biomechanics?the same principles they apply in practice. They value mattresses with an HR top layer for stable vertebral support, a visco (memory) layer underneath to reduce joint pressure, and no cheap T?foams that deform and overload the back.

Why don?t people buy mattresses with memory foam on top anymore?

Memory foam warms up from body heat, traps warmth, and ?glues? the sleeper to the bed, limiting airflow. The result: night?time overheating and moisture buildup. When the entire surface is visco, the mattress also responds more slowly when you change position, which can be frustrating. That?s why well?designed models place memory foam deeper, where it still relieves pressure but doesn?t kill ventilation. Shoppers disappointed by full?surface memory foam increasingly choose functional hybrids such as the Osaka?Air.

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