How to Choose the Right Mattress: Sizes, Materials and Firmness Guide
Choosing the right mattress means finding the best balance between comfort, support, materials, sleeping habits and long-term durability. The mattress is one of the most important elements in the bedroom: it directly affects sleep quality, everyday wellbeing and the level of comfort you experience every night.
There is no single best mattress for everyone, but there is a mattress that is best suited to your needs. To make the right choice, it is important to consider the size, type of support, firmness level, thickness, breathability and the relationship between the mattress, bed and bed base.
In this guide, we explain how to choose a mattress, starting from mattress sizes, the differences between memory foam, springs, latex and foam mattresses, how to choose between a firmer or softer feel, the ideal mattress thickness, which mattress to choose for back pain and how long a good mattress should last.
How to choose a mattress based on comfort, support and sleeping habits
Your mattress choice should always start from three key factors: perceived comfort, body support and personal sleeping habits. A mattress that is too firm or too soft, even if it is good quality, may become unsuitable over time and affect the quality of your sleep.
When choosing a mattress, do not focus only on the initial feeling of softness. A good mattress should welcome the body, but also support it correctly, avoiding excessive sinking or overly pronounced pressure points.
Your sleeping position also makes a big difference. Side sleepers, back sleepers, front sleepers and people who move frequently during the night can experience the same mattress in very different ways. For this reason, the choice should always be based on real everyday use, not only on the technical specifications.
- Consider who will use the mattress, one person or two.
- Choose the right size according to the bed and available room space.
- Compare the technologies: memory foam, pocket springs, Bonnell springs, latex and foam.
- Define your preferred comfort, firmer or more cushioning.
- Consider the thickness in relation to the bed, bed base and final height.
- Assess breathability, hygiene and durability according to daily needs.
A mattress should never be considered as an isolated element. The final result always depends on the complete sleep system made up of bed, bed base and mattress. A good bed frame with an unsuitable mattress, or the other way round, can significantly reduce overall comfort.
If you want to plan the whole sleeping area properly first, you can also read our guide on how to furnish a bedroom.
If you would like to explore the relationship between the bed, walkways and room proportions, we also recommend the guide dedicated to bedroom dimensions and distances.
Mattress sizes: single, small double, double, king size and special formats
Choosing the right mattress size is one of the first things to consider, because it directly affects comfort, freedom of movement and the overall proportions of the bedroom. There is no universal right size: the ideal mattress size depends on how many people will use the bed, the space available in the room and the level of comfort you want over time.
When talking about mattress sizes, it is important not to think only of the standard double mattress. Today there are many different options: from the single mattress for children’s rooms or compact bedrooms, to king size, oversize and more unusual solutions such as the round mattress, designed mainly for statement interiors or very spacious bedrooms.
| Type | Approximate size | When to choose it |
|---|---|---|
| Single | 80 / 90 x 190 / 200 cm | For one person, children’s rooms, compact bedrooms or multifunctional spaces |
| Small double | 120 x 190 / 200 cm | For one person who wants more space and extra comfort |
| European small double | 140 x 190 / 200 cm | For compact double bedrooms or those who want a smaller double bed |
| Standard double | 160 x 190 / 200 cm | The most balanced and widely used solution for two people |
| King size | Approx. 180 x 200 cm | For maximum comfort, greater freedom of movement and spacious bedrooms |
| Oversize | Over 180 x 200 cm | For specific requirements, large bedrooms or made-to-measure solutions |
| Round | Variable diameter | For design-led projects, very large bedrooms or distinctive aesthetic solutions |
The single mattress is the most practical choice for one person and for rooms where saving space is important. The small double mattress, on the other hand, is often an excellent compromise: it offers more comfort than a single without requiring the space of a full double bed.
The 140 cm mattress is an interesting solution for small double bedrooms, as it allows two people to sleep in the same bed with a smaller footprint than a standard double. The double mattress remains the most popular size, because it offers a good balance between comfort, model availability and easy placement in most bedrooms.
King size and oversize mattresses are designed for those who want more sleeping space or for bedrooms where the proportions allow for a more generous bed. The round mattress, finally, is a much less common choice: it can create a strong visual impact, but requires plenty of space, a dedicated bed frame and careful consideration from a practical point of view.
When choosing the mattress size, you should always consider the overall footprint of the bed, because the headboard, bed frame and structure may take up more space than the mattress alone. For this reason, the mattress should always be assessed together with room walkways, wardrobe door clearance and the relationship with bedside tables and other bedroom furniture.
To explore this topic in more detail, you can read our guide on how to choose the right bed and browse the beds category.
Types of mattress: materials, differences and when to choose them
One of the most common questions is whether to choose memory foam mattresses, spring mattresses, latex mattresses or foam mattresses. These are different technologies, each with specific characteristics in terms of cushioning, support, breathability and response to body movement.
Memory foam mattress: contouring comfort and adaptability
A memory foam mattress is made from viscoelastic foams that adapt to the shape of the body and help distribute weight more evenly during sleep. The feel is generally more contouring, with progressive and even cushioning.
- It adapts well to the body and helps reduce pressure points.
- It offers a softer, more enveloping feel.
- It is appreciated by those looking for ergonomic comfort and progressive support.
It can be a good choice for those who want a more comfortable and cushioning surface, but breathability should also be considered carefully, especially in warmer rooms or for people who tend to overheat at night.
You can view the available models here: memory foam mattresses.
Pocket sprung mattress: responsive support and better airflow
A pocket sprung mattress uses individually wrapped springs, which respond independently to different areas of body pressure. The result is more elastic, more precise and generally more breathable support.
- It offers responsive and well-distributed support.
- It promotes good internal airflow.
- It is suitable for those who want more support without giving up comfort.
- It helps reduce motion transfer between two people sharing the same bed.
From a technical point of view, it is not only the number of springs that matters, but also their diameter, the quality of the steel, the internal layout and any upper comfort layers. In general, a higher spring count can offer a more precise response, but the final feel of the mattress always depends on the full construction.
This is a very popular option for double beds, also because the independent spring response can improve sleep quality when two people have different weights or movement patterns.
Discover our pocket sprung mattresses.
Bonnell spring mattress: traditional support and a more uniform feel
The Bonnell spring mattress is the most traditional type of spring mattress. The springs are connected to one another and create a more uniform, classic type of support, with a generally firmer and more responsive feel.
- It offers a more linear response and a less enveloping feel.
- It is highly breathable thanks to its open internal structure.
- It suits those who prefer a more traditional sleeping surface.
This type of mattress can be suitable for those looking for essential, straightforward support, with a simple and proven internal structure, and for those who do not like a pronounced sinking sensation.
You can view the Bonnell spring mattresses category.
Latex mattress: elasticity and responsive comfort
A latex mattress offers an elastic, comfortable and well-supported feel. Unlike memory foam, it reacts more quickly to movement and provides a springier, less “hugging” sensation.
- It is elastic and responsive.
- It can offer good breathability, depending on the internal structure.
- It is suitable for those looking for a balance between cushioning and support.
Depending on its composition and processing, it can offer a good balance between comfort, support and ventilation.
Discover our latex mattresses.
Foam mattresses: lightweight, practical and dependent on density
Foam mattresses, often made from water foam or expanded polyurethane, are versatile and lightweight solutions. They can have very different firmness levels, but their quality depends above all on the foam density, rather than on mattress height alone.
- They are lightweight and practical.
- They can offer good value for money.
- They require careful attention to density to ensure durability and adequate support.
Firmness, support, density and comfort: what really matters
Choosing between a firm or soft mattress is one of the most delicate aspects, but focusing only on firmness is too simplistic. To choose well, you need to consider comfort, support, load-bearing capacity and material quality together.
A mattress that is too firm can create pressure on the shoulders, back and hips, while a mattress that is too soft may not support the body correctly and can lead to an unstable sleeping posture. The aim is to find a balance that keeps the spine in a natural position, without pressure points and without excessive sinking.
Objective comfort and subjective comfort
To understand a mattress properly, it is useful to distinguish between objective comfort and subjective comfort.
- Objective comfort: the actual ability of the mattress to support the body and maintain correct posture.
- Subjective comfort: the feeling you perceive when lying down, so whether the mattress feels soft, firm or cushioning.
A mattress may feel soft in the first few centimetres, but have a supportive internal structure, or it may feel firm at first without providing lasting support. For this reason, both aspects should be assessed.
The firmness scale: H1, H2, H3, H4, H5
Many manufacturers use the H scale (Hardness) to indicate the firmness level. It is not a universal standard, but it is a useful reference when comparing mattresses.
- H1 (soft): suitable for lighter people, usually under approx. 60 kg
- H2 (medium): the most common compromise, approx. 60–85 kg
- H3 (firm): firmer, suitable for medium-to-heavier body weights, approx. 85–110 kg
- H4 / H5: firm or extra firm, for higher body weights or specific needs
Firmness is always relative: the same mattress may feel soft or firm depending on body weight, build, sleeping position and also the type of bed base used.
Load-bearing support: the real support for the body
Load-bearing support is the actual ability of the mattress to support the body. It is one of the most important technical parameters, because it indicates how well the mattress resists weight without deforming excessively.
Support depends on:
- Foam density in memory foam or polyurethane mattresses
- Number and quality of springs in spring mattresses
- Internal structure and zone distribution
A good mattress should support the body evenly, following the natural shape of the spine without creating gaps or sagging.
Zoned support mattresses
Many modern mattresses are designed with zoned support (5, 7 or 9 zones), to adapt better to the different parts of the body.
The shoulders and legs require more cushioning, while the lumbar area and pelvis need more support. This zoning improves ergonomics and helps maintain correct posture during sleep.
However, if your height is very different from average, the zones may not align perfectly, which can change the perceived comfort.
Firmness and body weight: how perception changes
Firmness is always relative to body weight. The same mattress can feel very different depending on the sleeper’s build.
| Weight | H2 (medium) | H3 (firm) |
|---|---|---|
| Under 60 kg | Medium / cushioning | Very firm |
| 60–85 kg | Balanced | Firm |
| Over 90 kg | Too soft | Correct / balanced |
Foam density: how to read mattress quality
In memory foam or foam mattresses, density (kg/m³) is a key indicator of quality and durability.
- 20–25 kg/m³: occasional use
- 30–35 kg/m³: everyday use
- >45 kg/m³: high quality and long durability
A higher density indicates a more stable and durable structure, but it does not determine mattress firmness on its own.
Spring count: precision and support
In pocket sprung mattresses, the number of springs affects the precision of support: more springs usually means greater adaptability.
The wire diameter is also important: thicker wires make the mattress firmer, while thinner wires make it more cushioning.
How to choose a mattress by body weight, sleeping position and needs
To choose well, it is not enough to know the materials: you also need to understand how the mattress behaves according to your body type and the position you sleep in most often.
| Sleeping position | Lighter build | Average build | Heavier build |
|---|---|---|---|
| Side sleeper | More cushioning | Medium | Medium-firm |
| Back sleeper | Medium | Firm | Firmer |
| Front sleeper | Firm | Firm | Very firm |
As a general rule:
- side sleepers often prefer mattresses with more cushioning around the shoulders and hips
- back sleepers usually need more balanced and stable support
- front sleepers tend to prefer firmer support to avoid excessive sinking of the pelvis
- couples often benefit from pocket sprung systems or mattresses with good motion isolation
The relationship between mattress, bed and bed base
A mattress works properly only when it is correctly matched with the bed and bed base. For this reason, the choice should never be made in isolation, but as part of a complete sleep system.
Important note: the bed base can affect up to 20–25% of the final perceived firmness. This means that even an excellent mattress can feel too soft or too firm if placed on an unsuitable base.
A wooden slatted bed base, for example, offers elastic and flexible support, helping the mattress follow body movement. By contrast, a base that is too rigid or worn can reduce adaptability and compromise overall comfort.
Different types of bed base influence mattress performance in a concrete way:
- Wooden slatted bed bases: offer a good balance between elasticity and support, ideal for most modern mattresses, because they follow body movement and improve ergonomic comfort.
- Adjustable electric bed bases: allow you to adjust the position of the back and legs, but require compatible mattresses, such as memory foam or latex, that can adapt to movement without becoming deformed.
- Solid platform bases: provide uniform support without flex. They generally make the mattress feel firmer and are less breathable than slatted bases, but may be used in specific contexts or for particular support needs.
The structure of the bed also plays an important role: it affects the final height, mattress ventilation and everyday practicality. A well-designed bed helps air circulation and contributes to keeping the mattress more hygienic over time.
A truly correct choice should therefore always consider the entire sleep system:
Assessing these elements together allows you to achieve a coherent result, avoiding common mistakes such as choosing a quality mattress and pairing it with the wrong bed base, thereby compromising much of the comfort.
Mattress thickness: how much does it really matter?
Mattress thickness affects both comfort and the final proportions of the bed. It is not only an aesthetic detail: the right thickness can help improve support, cushioning and perceived quality.
In general, good-quality mattresses often fall within medium or medium-high thickness ranges, but the correct choice always depends on the internal structure and the relationship with the bed, bed base and final height from the floor.
- Thinner mattresses can be suitable for specific solutions or low beds.
- Medium-thickness mattresses often offer the best balance between comfort and proportion.
- Thicker mattresses create a more substantial look and can increase the feeling of comfort.
However, the overall result should always be considered. A very thick mattress on an already high bed frame can alter the final bed height too much and affect the relationship with the headboard, bedside tables and the visual balance of the room.
To explore this aspect together with bed proportions, you can read our guide on how to choose the right bed.
How long does a mattress last and when should you replace it?
A good mattress is designed to last, but it does not maintain the same performance forever. With everyday use, materials compress, elastic response decreases and the level of comfort and support gradually changes.
Under normal conditions of use, it is advisable to replace a mattress every 8–10 years. This time frame helps maintain the right balance between ergonomic support, hygiene and sleep quality.
Over time, the internal components — foams, springs and padding — lose part of their ability to provide support. Replacing the mattress therefore means restoring its original performance and improving sleep quality, with tangible benefits for everyday wellbeing.
The hygiene aspect should also be considered: over the years, a mattress can accumulate moisture, dust and micro-residues, which may affect comfort and the healthiness of the sleep system.
Regardless of age, there are some clear signs that indicate when it is time to change it:
- Loss of support and a sinking sensation.
- Visible deformation on the surface.
- Reduced comfort compared with the first years of use.
- Waking up less rested or with increased muscle tension.
Proper maintenance can still help extend its lifespan:
- Rotate the mattress head-to-foot every 3–4 months.
- Air the bed daily to reduce moisture.
- Use a breathable mattress protector to protect it over time.
Finally, it is essential to pair it with a suitable bed base: the right support helps preserve the mattress comfort, structure and performance for longer.
Mistakes to avoid when choosing a mattress
Even a good mattress can become the wrong choice if it is not assessed in the right context. The most common mistakes mainly involve comfort, size and the relationship with the rest of the bedroom.
- Choosing only based on the initial softness, without assessing real support.
- Not considering the correct size in relation to the bed and available room space.
- Ignoring the relationship with the bed base and frame, compromising final comfort.
- Assuming that firmer always means better, especially in the case of back pain.
- Overlooking material quality, especially density and internal structure.
- Delaying replacement for too long when the mattress no longer provides adequate support.
Frequently asked questions about choosing a mattress
How do I choose the right mattress?
To choose the right mattress, consider the size, type, comfort level, support, material quality, thickness and the relationship with the bed and bed base.
Is memory foam or a sprung mattress better?
Memory foam offers a more contouring feel, while pocket springs provide more elastic and breathable support. The right choice depends on personal preference and sleeping habits.
Is a firm or soft mattress better?
There is no single answer for everyone. The aim is to find the right balance between cushioning and support, based on desired comfort, body type and sleeping position.
Which mattress should I choose for back pain?
In general, it is advisable to choose a mattress that supports the body well without being excessively firm or too soft. The correct comfort level always depends on personal needs.
How long does a mattress last?
Lifespan varies depending on quality, materials and use, but when the mattress loses support, becomes deformed or no longer provides adequate comfort, it is worth considering replacement.