Which mattress brand should you choose?

Name: Comparison of polyurethane foams
Creator: Onsen Sp. z o.o.
License: https://creativecommons.org/licenses/by-nc/4.0/

Deciding to buy a new mattress is one of the most important investments in your health and comfort. However, many people wonder which mattress brand to choose when the market is full of conflicting information, rankings and advice. Unfortunately, most mattress specifications you find online are not objective. We say this as a mattress manufacturer who refuses to take part in such practices.

In particular, mattress rankings are rarely based on independent research. Most often, these are listings created by stores or manufacturers promoting their own products. This means that instead of reliable knowledge, the reader gets cleverly disguised advertising.

The problem with the manipulated mattress industry is that consumers usually lack the tools to recognize this manipulation. Online platforms are eager to publish sponsored articles where specific companies buy top positions in rankings. Often, all it takes is a payment for publication, though sometimes it's part of a more complex marketing collaboration.

The result is always the same: the customer receives content that pretends to be objective advice but is in fact hidden advertising. Unfortunately, for those wondering which mattress brand to choose, this creates informational chaos and increases the risk of a poor purchase.

At ONSEN®, we firmly oppose such practices and promote an honest, education-based model. Our approach is grounded in complete transparency and integrity, regardless of industry trends. We believe that health and sleep comfort are too important to be manipulated by marketing tricks. So instead of buying spots in mattress rankings, we prefer to educate and encourage people to verify facts for themselves. We show what to look for when buying a mattress to choose a trustworthy brand.

Why aren't mattress rankings reliable?

When you type the phrase which mattress brand to choose into a search engine, you’ll most likely come across dozens of rankings and “best mattress” lists. When you're searching for the best mattress, it sounds promising, right? Unfortunately, in most cases, these have nothing to do with honest advice that consumers rightfully deserve. They’re mostly created by online stores that simply rank their own mattresses at the top - and often by press portals, for a fee. As a result, the customer believes they're making a well-informed choice, while in reality, they're buying just any old thing.

Sometimes it’s even worse when a mattress ranking is created in collaboration with a manufacturer. In that case, the list of best mattresses is simply adjusted according to who pays more. It's a typical form of native advertising - it pretends to be objective, but its only purpose is to sell. Moreover, many news portals publish such rankings because they’re an easy source of income. The consumer doesn’t realize they’re reading a sponsored article and not an independent recommendation.

These practices are nothing more than manipulation, because instead of honest information about mattress quality, the customer gets gift-wrapped garbage. Often it’s only after a few months that they realize the mattress doesn't meet their expectations. And by then, getting a refund or filing a complaint is difficult, as the return and warranty policies are usually written to make life hard for the customer rather than help them.

In Europe, we lack portals like Consumer Reports, considered one of the most trustworthy and respected ranking platforms, or Sleep Foundation, which compares technical specs with real opinions. We also lack sites like Sleepopolis, which publish reviews, tests, comparisons, and buying guides.

What are the key criteria when choosing a mattress?

If you truly want to know which mattress brand to choose and not regret it later, you definitely need to look beyond just ads or rankings. What matters most are specific criteria that distinguish honest companies from those using manipulative tactics.

Check whether you’re dealing with a Polish company with established business ethics. Poland is a strong market for polyurethane foam, so it’s rare to find Chinese-made foams. It’s not just about economic patriotism, but about easier contact with the manufacturer. It’s also about shorter mattress delivery times and actual after-sales service. Companies importing foreign mattresses, or even Polish firms producing mattresses under many brands, often disappear after a few years, leaving customers without support.

Read the mattress warranty terms carefully, even if they seem long. A trustworthy company doesn’t hide behind fine print, because it doesn’t use traps. The mattress warranty should be clear and straightforward, and practically usable. Very often, warranty terms contain dozens of conditions that make it nearly impossible to use it.

The ability to return the mattress is very important, since you can only truly test it in your bedroom. Many brands advertise trial periods, but often this only means an exchange for a more expensive model. A return, as understood by the ONSEN® brand, means getting your money back, not swapping for something the customer didn’t want in the first place. If a company offers 100 days to test it in your bedroom, it’s confident in the quality of its product.

Mattress composition - who dares to tell the truth?

One of the most controversial topics is disclosing the composition of a mattress, even though there really shouldn’t be any controversy. In Poland, most manufacturers and stores still hide real data, using invented proprietary names. Some of them also invoke trade secrets, which simply do not apply to composition. Proprietary names may sound professional, but in practice they reveal nothing about physical or chemical properties.

There are even cases of outright lies, where T foam, a cheap closed-cell foam, is labeled as high‑resilience, despite having nothing to do with HR foam. Customers are misled to believe that there’s something else inside than there really is. Often, the same mattress core is given two different names and external designs to fit the customer's budget. That’s why in stores, the budget question usually comes first – it’s not about advice but sales manipulation.

They also claim the mattress contains no polyurethane foams, but modern materials instead. In reality, every T, HR or V foam is a polyurethane foam. Customers are misled about “natural foams”, while the amount of plant oils they contain is trace. If there were more, the foam would lose its foam properties and wouldn’t even be foam anymore. There is also no scientific proof that these additives provide any benefits for sleep comfort, let alone health.

Of course, there are biopolyols that contain hydroxyl groups reacting with isocyanates in the polyurethane reaction in the same way as synthetic polyols. However, even if a polyurethane foam contains biopolyol, it still isn’t fully natural. The standard is that biopolyols make up about 20% of the entire polyol blend.

A reliable company should disclose the mattress composition precisely – using technical parameters like foam type, density and firmness, as well as other chemical and physical properties. That’s the only way consumers can compare mattresses across brands. So if you only see trade names with no specifics, you’re dealing with manipulation.

Comparison of polyurethane foams
foam type	foam density	foam advantages	foam disadvantages	sources
comparison of polyurethane foams
T foam (traditional) other names: upholstery foam classic foam	15‑25 kg/m³	lower cost, easy to produce	poor dynamics, closed cell structure, poor air circulation, low durability	Sleep Foundation Polyurethane Foam Association Sunkist Machinery
HR foam (high‑resilience) other names: cold foam elastic foam	25‑60 kg/m³	high dynamics, open cell structure, good air circulation, high durability	higher cost, harder to produce	Polyurethane Foam Association Mattress Recycling Council Journal of Cleaner Production
V foam (viscoelastic) other names: thermoplastic foam memory foam viscoelastic foam	35‑80 kg/m³	body‑shape adaptation, better blood flow	dynamics near zero, may cause overheating, sinks under body, lacks support properties	Saint‑Michel Wiley Springer

The general rule is that higher foam density implies greater mattress durability. But even scientific studies show it’s not that simple. Everything depends on quality, additives, or cell structure, and thus on foam type and its manufacturer. Also remember that foam firmness is not the same as density.

How to check a company before buying a mattress?

The best way to decide which mattress brand to choose is to verify it yourself. Don’t blindly trust ads, rankings or forum reviews - many of them are either sponsored or simply paid for. A large number of online comments don’t come from real customers, but from marketing agencies hired by manufacturers or stores. That’s one reason why it’s so easy to fall into the trap of the “best mattress” based on someone else’s opinion.

Visit a store and ask the sellers specific questions to test their knowledge. Always demand the full composition of the mattress - not just fancy marketing names - and get it in writing. Also check whether the warranty and return policy are written in plain language and are actually usable. Pay attention to how the sellers react when you ask for hard facts. Always check whether they give you clear answers or just hide behind vague claims and ad slogans. Sometimes the salesperson’s behavior will tell you more than any product description.

During your shopping experience, talk to the sellers and listen carefully to the stories they tell. Some will talk about miracle natural foams, others about space-age technologies. But in reality, natural foams don’t exist. Adding plant-based oils is possible, but only to a very limited extent - and it adds practically nothing of value to the mattress.

Other sellers will ask about your budget to play what’s known as the name game. This technique means that the same mattress can be sold under different names and with different appearances. Each version has a different price, adjusted to match your spending limit. And that’s just the start of the manipulation iceberg you’ll find in many stores.

Contrary to popular belief, buying a mattress online is often safer than buying one in-store. But it’s crucial to read the terms and conditions of online stores before making a purchase. There you’ll usually find out whether returning a mattress actually means getting your money back, or just exchanging it for another model. If the policy is full of exceptions and fine print, that’s a red flag that the company might not be trustworthy.

Of course, you don’t have to believe us - after all, you’re reading this on our website. That’s exactly why we encourage you to visit physical stores and send questions directly to manufacturers. Find out who is willing to share the complete mattress specifications with technical data - not just empty branding. See who offers a real in-bedroom trial instead of a few minutes on a showroom model. Read the return and warranty policies carefully, because that’s where the truth lies.

Remember that when buying a mattress, you need to base your decision on facts and logic. When you buy a car or a smartphone, you know all about its components. The same should apply to your new mattress - and that takes education. So always verify the data yourself throughout the buying process. Check the facts, test it and see for yourself whether we’re telling the truth or not.

How to verify a mattress’s specifications on your own?

Remember that the seller has a legal obligation to disclose the composition of the mattress. This is stated in Article 546 §1 of the Polish Civil Code, which requires the seller to provide the buyer with necessary information about the product before signing the contract. Articles 556–576 also state that the seller is liable for warranty claims if the product is defective – meaning the new mattress doesn’t have the properties promised or isn’t suitable for the buyer’s stated purpose.

Lack of accurate information about the parameters of polyurethane foams means the mattress does not comply with the contract. This is confirmed in Article 43b paragraphs 1–2 of the Consumer Rights Act, which requires the seller to deliver a product consistent with its description, quality and functionality. Hiding such information is a violation of the law and may be considered bad faith.

✅ What to check before buying a mattress?

Check the type of foam
HR foam is elastic and durable, supports the body well and allows air to circulate. Visco adapts to the body but doesn’t support it and traps heat. T foam is less durable with a closed-cell structure.
Check foam density
Higher density usually means greater durability and stability, but too much can reduce comfort. The manufacturer should provide the density in kg/m³ for each layer.
Check foam firmness
The H1–H4 scale is not standardized. Ask for firmness in kPa or N (according to ISO) – that’s an objective metric.
Check the mattress cover
Covers with visco foam sink in, heat up and are often not washable. Additives like silver or aloe have no proven benefits. Cooling gels work only briefly.
Check cover elasticity
Quilted covers with felt or wadding are stiff and transfer movement. Better options are elastic, high-weight covers that improve comfort and fit.
Check mattress weight
Mattress weight is an indirect quality indicator – heavier usually means higher foam density and longer lifespan. A suspiciously light mattress is a red flag.
Check the adhesives between layers
Water-based glues are healthier and usually better smelling. Solvent-based adhesives (often found in discount stores) can release volatile compounds and are less user-friendly.
Don’t forget to question the seller
Sellers are usually trained to sell, not to advise. “In-store physiotherapists” are often a marketing gimmick – physiotherapy studies don’t include foam materials or mattress construction.

Remember that polyurethane foams are always labeled by manufacturers in the same way. Before buying a mattress, you should know that the full foam specification consists of a letter and five digits. The letter (V, T or HR) indicates the type of foam, the first two digits are the density in kg/m³, and the last three are the firmness in newtons.

Why is it worth choosing ONSEN®?

We never hide that we are a mattress manufacturer whose mission is education. You won’t find us in sponsored rankings, because we despise them and see them as manipulation. Our philosophy demands honesty and transparency, which we practice at every step. Probably as the only store and manufacturer in the country, we give the full mattress composition and offer you 100 days to test it in your own bedroom. We also provide a simple mattress guarantee because we don’t play marketing tricks.

Our ethics are based on never misleading customers – we care not about transactions, but relationships. We don’t use name game, nor pretend that T‑foam is high‑resilience. We don’t push tales of natural foams, because they’re all petroleum‑derived. We believe the only path to trust is truth, not manipulation. That’s why we describe every product clearly and measurably; you won’t find empty slogans here.

It’s also worth knowing that testing mattresses in-store is often a sham. First, the store may deliver a different mattress than the one on display. Without a clear written declaration of composition, the customer has no way to prove the difference. Second, the conditions in-store are never like those in your bedroom. In stores the temperature, clothing, and focus are different. You lie fully clothed, for just minutes, while controlling your movements under the pressure of a salesperson.

During sleep the body is passive, fully governed by the brain. Yet your mattress has jobs to be done: support your spine, distribute weight, adjust to your body. In a physical store you can’t test that unless you sleep there for nights. You only see how the display mattress looks and hear the salesperson’s words. That’s why at ONSEN® we emphasize a real test of the Osaka Air mattress in home conditions. No strings attached – we give you 100 days to see how the mattress works in your own bedroom.

We decided not to distribute in physical stores for reasons like that. Also because of large retailer margins, which would multiply the mattress price by three – something we deem unacceptable. But we never expect you to take us at our word – quite the opposite. We strongly encourage you to verify the knowledge you find on our blog and YouTube. Compare our offer to other manufacturers, ask questions to retailers, and read the terms. You’ll find quickly that there are no empty slogans here, only bare truth. ONSEN® is a brand that doesn’t manipulate and tells the truth – such brands are a rarity.

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: Which mattress brand should you choose?

Which company makes the best mattresses?

The best mattresses come from companies that prioritize material quality, transparency in composition, and fair warranty conditions. A trustworthy brand does not hide foam density details, allows customers to test the mattress at home, and enjoys positive customer reviews. It’s worth choosing reliable and transparent manufacturers. One such company is Onsen Sp. z o.o., operating under the ONSEN® brand.

Is the ONSEN® mattress the best?

The Polish brand ONSEN® stands out for disclosing the full mattress composition, offering 100 nights of in-home testing, and providing a simple, no-catch warranty. The mattresses offered by this company feature a well-thought-out design, layered foam structure, and cutting-edge technology. This results in high functionality, comfort, and health benefits. Ultimately, the decision depends on the consumer's personal expectations.

Who makes the best mattresses?

The best mattresses are made by companies that: provide detailed technical data on materials and construction; offer in-home trials and easy returns; guarantee clear and fair warranties; deliver post-sale support; and maintain a strong reputation. These are rarely the biggest corporations but rather specialized brands that care about quality and service - like ONSEN®.

What to consider when choosing a mattress?

Key factors when selecting a mattress include: foam composition and density; firmness and support level; durability and resistance to deformation; ventilation and breathability; return policies and trial periods; manufacturer reputation; and quality of customer service. A good mattress supports the spine effectively and ensures long-term comfort.

How to tell if a mattress and brand are good?

A quality mattress is made from durable, breathable materials and follows a thoughtful design. A well-made mattress provides ergonomic support and body contouring - without causing sinking or suction. A reliable brand reveals the full composition and technical specs, allows at-home trials, and offers easy returns. The warranty should be clear and straightforward. This combination of transparency, quality, and service ensures the mattress is a smart choice.