Firm, Balanced or Soft Mattress

Q: Should you always choose a firm mattress if you have back pain?

No, this is a persistent misconception. A mattress that is too firm actually creates marked pressure points at the shoulders, hips, and pelvis, which can exacerbate back pain rather than relieve it. The goal is to find a mattress that supports the spine in its natural alignment while absorbing the broader areas of the body. For most profiles suffering from back pain, a medium-firm to balanced mattress with a progressive comfort layer (memory foam or latex) offers the best compromise. The practical rule: firmness should be adapted to your body shape, not your pathology. Check our dedicated back pain guide for more information.

Q: How do I know if the firmness is right for me?

Several simple tests can validate the right firmness during the trial. First, lie on your back for at least 10 minutes: you should not feel excessive sinking at the pelvis or a hollow under the lumbar curve. Then, turn on your side: the shoulder and hip should sink just enough for the spine to remain straight, parallel to the mattress. If you sleep on your stomach, the pelvis should not sink below the shoulder line. Always take advantage of the home trial period (100 nights with most online brands, 6 months with Someo) — it’s the only true test after 2 to 3 weeks of adjustment.

Q: What density should I choose?

Density determines durability and support. For polyurethane foam, count **at least 35 kg/m³** for occasional use and **40 to 50 kg/m³** for daily adult sleeping. For memory foam, aim for **50 to 70 kg/m³** depending on your weight — the heavier you are, the higher the density should be. For latex, the range is between **70 and 85 kg/m³**: 75 kg/m³ for balanced comfort, 85 kg/m³ for marked firmness. A mattress below these thresholds will sag prematurely, usually in 3 to 5 years. The density should be clearly indicated by the manufacturer — its absence is a warning sign.

Q: Is a balanced mattress suitable for everyone?

Yes, for the majority of sleepers, but with nuances. The balanced firmness is the most versatile and constitutes the best compromise for couples with similar body shapes, sleepers in mixed positions (alternating back/side), and profiles between 60 and 90 kg. However, it reaches its limits for individuals over 95 kg (lack of long-term support) and for smaller individuals under 55 kg sleeping strictly on their side (the welcome can sometimes be too firm to relieve shoulders and hips). In these cases, directing the choice towards a firm or soft model provides better comfort, or opting for a double-sided mattress with differentiated firmness.

Q: When should you change your mattress?

The average lifespan is between 8 and 10 years, but several signs should alert you before this deadline. Regularly check for: visible or marked hollows at the hips/shoulders, springs that can be felt, unusual noises, waking up with aches or stiffness when the bedding is not the issue elsewhere, new allergies that fade while traveling. Entry-level models with low density may show these signs as early as 5 to 6 years. Conversely, a well-maintained natural latex or high-end French mattress can last 12 to 15 years. Beyond 10 years, even without visible sagging, the mattress has accumulated dust, dust mites, and lost hygiene — a renewal is still recommended.

Choosing a mattress is an essential decision that directly impacts your sleep quality, health, and daily well-being. An unsuitable mattress can cause back pain, nighttime awakenings, or a persistent feeling of fatigue. Conversely, a well-chosen mattress promotes recovery, spinal alignment, and deep sleep.

Why is mattress choice essential?

An appropriate mattress is the foundation of restorative sleep. It plays a key role in:

Spinal alignment
Personalized support based on weight and body shape
Optimal muscle recovery
Prevention of sleep disorders

According to the National Institute of Sleep and Vigilance (INSV), the quality of bedding directly influences sleep quality.

Important selection criteria

a. Firmness

Firm: for heavier individuals (>90 kg), or those sleeping on their back/stomach.
Balanced: for average body types (60–90 kg) and mixed positions.
Soft: for lighter individuals (<60 kg) or those sleeping on their side.

b. Body shape and weight

<60 kg: soft or plush
60–90 kg: balanced or medium-firm
90 kg: firm to very firm

c. Sleeping position

On the back: firm or balanced
On the side: soft or balanced
On the stomach: firm or balanced

d. Technology

Pocket springs: good support, ventilation, independence of sleeping.
Memory foam: enveloping, relieves pressure points.
Latex: natural, breathable, resilient.
HR foam: good price/support compromise.

e. Other criteria

Dimensions suitable for the sleeper and the room
Budget: good mattress from €300–600
Maintenance: removable, hypoallergenic cover
Ecology: natural latex, European manufacturing, certifications