How to choose a mattress in 6 steps: types, firmness, and sizes
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In short
When choosing a mattress, decide in this order: size, sleeping position, weight, material, firmness, and purchasing terms. If you sleep with a partner or have no special needs, a hybrid with pocket springs, memory foam, and high firmness, such as Morfeo's Original Hybrid, is the safest starting point. If you get hot, look at the VisCool; if you weigh more than 95 kg, the XL Mattress.
By the Morfeo team · manufactured in Yecla (Murcia) · updated on October 11, 2026
In this guide
A mattress is not chosen by brand or by the "best" label. It is chosen by who is going to sleep on it. These six steps take you from what is non-negotiable (the size of your bed, your weight) to what is more personal (the firmness you like). At the end, you have a selector that tells you which Morfeo model is right for you.
Step 1. What mattress size do you need?
Start with what you already have: the mattress must match the base, bed frame, or storage bed. If you are also going to change the bed, then you can choose the size freely. The most common in Spain are these:
| Size | Usually for |
|---|---|
| 80x200 | A tall person, or two twin beds that together form a 160x200 |
| 90x190 | One person, single or youth bed |
| 135x190 | One person with space or a couple in a small bedroom |
| 140x200 | A couple in a small bedroom if one of the two is tall: 10 cm longer than the 135x190 |
| 150x190 | The most common couple size |
| 160x200 | A couple that wants more width and length |
| 180x200 | A couple that wants extra space, or that sleeps with small children |
| 200x200 | The largest bed we make: one meter wide for each person |
If you are tall, look at the length before the width: in addition to the 200 cm, the Original Hybrid and the Altus are also made in 160x210. You have all the sizes and how they fit with each type of bed in the mattress sizes in Spain guide.
Step 2. How do you sleep?
Your position determines how much the mattress surface needs to let you sink in so that your spine remains straight:
- On your side. The shoulder and hip are the points that apply the most pressure. You need a comfort layer that lets them sink in a little without the waist sagging. A medium or medium-high firmness usually works well.
- On your back. The key is that the lumbar area does not end up in the air or the hip sinks. Medium-high or high firmness.
- On your stomach. If the hip sinks, the lumbar area arches. It requires a firm mattress and a low pillow.
- You change positions. You are interested in a mattress that does not "trap" you: pocket springs and latex respond faster than pure memory foam.
If you sleep with a partner, add a criterion: bed independence, which is the little you notice when the other moves. Pocket springs win there, because each spring works separately.
Step 3. Your weight matters
It is the criterion that does not allow nuances. With more weight, the core compresses more: a mattress that is firm for a 60 kg person may fall short with 100 kg. That is why it is advisable to look at two things in any mattress: what weight it is guaranteed for and if the firmness is designed for yours.
The weight rule at Morfeo
All Morfeo mattresses are guaranteed up to 95 kg per person. If you weigh more, the one that corresponds to you is the XL Mattress, designed for people over 100 kg, with pocket springs and high-density foam in a reinforced structure. If you sleep with a partner and only one of the two exceeds that weight, the mattress must also be the XL.
And do not forget about support: a mattress for more weight needs a base that can support it. The Samos and Naxos bases and the Morfeo storage beds support more than 100 kg per person.
Step 4. What types of mattresses are there and which one is right for you?
This is where the purchase gets most complicated, because every store gives its materials a different name. In reality, almost all the mattresses you will see come down to five types:
| Type | How it works | Pros | To consider | Fits with |
|---|---|---|---|---|
| Memory foam | Foam that softens with heat and body pressure and adapts to its shape | Relieves pressure points; does not transmit movement | Retains more heat; takes time to recover its shape when you move | Those who sleep on their side and seek comfort, and do not get hot |
| Pocket springs | Each spring is inside its own fabric bag and works independently | Point-by-point support, bed independence, air circulates | Needs comfort layers on top so as not to feel hard | Couples, hot sleepers, those who want firmness |
| Hybrid | Pocket spring core with layers of memory foam, latex, or other foams on top | Combines the support and ventilation of the spring with the comfort of the foam | Taller and heavier than a foam one | Most profiles, especially couples |
| Latex | Natural (or synthetic) elastic foam that adapts and recovers its shape quickly | Elastic, breathable, good response when changing position | Usually more expensive; it is advisable to check if it is natural | Those who seek natural materials and a cozy feel |
| HR foam | High resilience (HR, high resilience) polyurethane foam: it deforms and recovers its shape immediately | Light, quiet, usually more affordable | Ventilates less than a spring core | Youth beds, bunk beds, guest mattresses, tight budgets |
Traditional springs (biconical or continuous) still exist: the springs are connected to each other, so they transmit more movement than pocket springs. And water mattresses, which had their time, need a vinyl chamber and a system that heats the water; today hybrids and memory foam solve them better, which adapt and support without that maintenance.
Are you torn between the two best sellers? We explain it to you in depth in memory foam or pocket springs: differences. And if you are attracted to natural, in the natural latex mattresses guide.
What type of mattress is each Morfeo model
Five of our six mattresses have a pocket spring core and change the top layers; the sixth, the youth one, is HR foam.
- Original Hybrid: more than 2,000 pocket micro-springs + memory foam. High firmness with comfort.
- Altus: the same core with linen outer fabric. Medium-high firmness.
- VisCool: VisCool memory foam and PCM thermoregulating fabric on pocket springs. High firmness, the coolest of the range.
- Nature: pocket springs, natural latex, and organic cotton topper. Medium firmness.
- XL Mattress: reinforced pocket springs and high-density foam, for more than 95 kg.
- Youth Lite: high-density HR foam with 4 cm of Visco Airscape. Medium firmness, from 4 to 18 years.
Does density matter?
Density is the weight of a foam per cubic meter (kg/m³). It is useful data, but with two conditions: it serves to compare foams of the same type with each other (one memory foam with another memory foam) and it does not measure firmness, but the amount of material. At the same type, more density usually means that the foam withstands the passage of years better. In a spring mattress, the density of the foam layers counts, but the support is given by the springs.
One side or two?
Almost all current multi-layer mattresses are single-sided: the comfort layers go on top and the base is designed to support, so they are not flipped, only turned from head to foot every now and then to distribute wear. The two-sided ones allow them to be flipped. None is better by definition; what matters is to follow the care instructions of the model you buy.
Step 5. Hard or soft? Adjust the firmness
Firmness is not synonymous with quality or health: it is the sensation of support that the mattress gives. What you are looking for is that, lying down, the spine remains more or less straight, like when you are standing up. A mattress that is too soft lets the hip fall; one that is too hard loads the shoulders and hips.
| Firmness | Usually fits with | At Morfeo |
|---|---|---|
| Medium | Low-weight people, those who sleep on their side and seek comfort | Nature, Youth Lite |
| Medium-high | Most adults, on their side or on their back | Altus |
| High | On their back or on their stomach, those who prefer to feel the mattress firm | Original Hybrid, VisCool |
| Reinforced high | More than 95 kg | XL Mattress |
If you come from a very soft mattress, count on a few days of adaptation. You have the complete explanation in what is better, hard or soft mattress, and all the high firmness models in the collection of firm mattresses. If you have back pain, the mattress can help you maintain a good posture, but it is not a treatment: if the pain persists, consult your doctor or physical therapist.
Step 6. Review the purchasing terms
Choosing the mattress well is half. The other half is being able to rectify if you don't get it right. Before paying, compare this:
Before paying
What you need to be clear about
- Home trial: how many nights and if there is a minimum before you can return it.
- Warranty: how many years and from how many centimeters of sinking it covers.
- Maximum weight: up to how many kilos per person is it guaranteed.
- Cover: if it comes off and how it is washed.
- Term and shipping: how many days it takes and if shipping is included.
- Return: who pays for the pickup if it does not convince you.
In Morfeo mattresses: 100 nights of trial without a minimum, 10 years of warranty (manufacturing defects), 95 kg per person (more: XL Mattress), delivery in 3-7 business days with free shipping in the peninsula, free pickup if you return it and manufacturing on demand in Yecla (Murcia).
And if you prefer to split the payment, Morfeo mattresses can be paid in 3 interest-free installments with Klarna or in 4 with Alma, at the same price you see on the web. We explain it to you in mattresses in interest-free installments.
If you want to compare models with these criteria, in the best Morfeo mattresses in 2026 by sleeper type and budget you have the complete table with prices.
Find your mattress in two clicks
Mark how you sleep and what sensation you prefer:
1. What describes you best?
2. What sensation do you prefer?
On your side and with a preference for firm, Altus is the balance: medium-high firmness, one point less than the Original Hybrid, on more than 2,000 pocket micro-springs, with linen fabric that breathes. It lets the shoulder sink just enough.
On your back or on your stomach and seeking firmness: high firmness with a layer of memory foam that welcomes you without you sinking, so the hip does not fall. It is the most chosen of Morfeo and has a cover washable at 30 °C.
The coolest of the range: PCM fabric that absorbs excess heat and returns it when you cool down, with high firmness on pocket springs.
Above 95 kg is the one that corresponds to you: reinforced pocket spring structure and high-density foam, designed for more than 100 kg, with high firmness.
On your side and seeking comfort: medium firmness, natural latex that adapts to the body and organic cotton topper, with pocket springs underneath so the waist does not sag. The tallest of the range, 32 cm.
If you sleep on your back and want something slightly less firm, the Altus is one firmness level lower (medium-firm) without losing the support of pocket springs. If you sleep on your stomach, the Original Hybrid is better, as your hips should not sink.
If you get hot and prefer a less firm feel, the Altus is the second coolest in the range, with natural linen fabric and medium-firm support. If heat is your main concern, the VisCool is still the coolest.
We’ll be clear: for anyone over 95 kg, there is no softer version we can recommend. The XL is the only one in the range designed for that weight; the others are guaranteed for up to 95 kg per person.
Is it for a child or teenager? Then the right choice is the Juvenil Lite, which is medium-firm, 22 cm thick, and fits in daybeds and bunk beds.
Frequently Asked Questions
Which type of mattress is best?
No single type is best for everyone. Pocket springs provide point-by-point support, motion isolation, and good ventilation; memory foam relieves pressure and adapts to the body, but retains more heat; latex is elastic and recovers quickly; HR foam is lightweight and usually more affordable. Hybrid mattresses combine a pocket-spring core with memory foam or latex layers, and they are the option that suits the most people.
Which mattress should I buy if I sleep on my side?
One that allows the shoulder and hip to sink in slightly without the waist sagging: medium or medium-firm support with a good comfort layer. At Morfeo, the Altus (medium-firm) or the Nature (medium).
What mattress firmness do I need?
It depends mainly on your weight and sleeping position. The heavier you are, the firmer support you need to prevent your hips from sinking; for side sleepers, a little surface comfort usually works best, while firm mattresses are better for stomach sleepers. Rather than looking at a number on a scale, make sure your spine stays straight, as it does when you are standing.
What is mattress density and which should I choose?
Density is the weight of foam per cubic metre (kg/m³). It is useful for comparing foams of the same type: with the same material, higher density usually means greater durability. It does not measure firmness and does not apply to springs, so do not compare the density of memory foam with that of HR foam.
Is a single-sided or double-sided mattress better?
Today, most multi-layer mattresses are single-sided: the comfort layers are on top and do not need to be turned over, only rotated from head to foot occasionally. Double-sided mattresses can be flipped to distribute wear. It is important to follow the manufacturer's instructions for the model you buy.
What mattress size do I need for two people?
For two adults, the most common size in Spain is 150x190; if you have the space, 160x200 gives you more width and length. The mattress must match the size of the base, bed frame, or storage bed you plan to use.
Is it worth buying a mattress online without trying it?
Yes, if the store lets you try it at home with clear terms. Check how many trial nights you have, if there is a minimum period before you can return it, and who pays for collection. At Morfeo, you get 100 nights with no minimum period, and returns are collected free of charge.
Now you know what to look for
If you are still unsure, start with the Original Hybrid: it is the most popular choice, and you have 100 nights to check if we got it right for your bed.
