How Can You Tell If a Mattress Is Too Soft?

When we think of a soft mattress, we often associate it with coziness and a good night’s sleep. However, a mattress that’s too soft can be exactly the opposite—a silent source of pain, poor posture, and poor-quality rest.

After all, how can you tell if your soft mattress is doing you more harm than good? And what are the signs that it’s time for a change?

What is a soft mattress?

A soft mattress is one that yields more easily to the body’s weight, creating a sensation of sinking in and being cradled. This feature may feel very pleasant at first, but it doesn’t always meet the body’s actual needs during sleep. It is recommended for:

• People who are underweight, whose bodies need more cushioning;
• People who sleep on their side, as this relieves pressure on the shoulders and hips;
• People who prefer a "hugging" sensation or moderate sink;
• Couples with significant differences in weight (in combination with independent zone technology).

Softness of a mattress

The softness of a mattress is directly determined by the materials used in the top layers that come into direct contact with the body. The materials most commonly used to create this soft feel are foam, latex, and natural fibers such as cotton or wool. The thicker and softer these layers are, the greater the feeling of sinking in.

The perception of softness is also influenced by body weight. A heavier person will sink deeper into the same mattress than a lighter person—which means that a mattress rated as "medium" may feel soft to someone who is heavier and firm to someone who is lighter. You can learn more about mattress firmness here.

However, softness doesn’t necessarily mean a lack of support—and this is where the difference lies between a soft, comfortable mattress and a problematic soft mattress.

Types of soft mattresses: what are the differences?

Not all soft mattresses are created equal. Understanding the different types of mattresses available helps you figure out which ones offer softness with the right support—and which ones to avoid.

Latex Mattress

Latex mattresses provide ergonomic support and excellent stability, offering a balance between firmness and softness. Latex also stands out for its elasticity, durability, and breathability, contributing to a cooler sleeping environment, as is the case with the Actinuit Spring Latex Adapt mattress. Additionally, it features 7 distinct comfort zones, designed to provide support for different parts of the body, such as the head, shoulders, lower back, hips, and legs.

Memory foam mattress

It is one of the most popular types of mattresses in the soft category. It conforms to the body with body heat, relieves pressure points, and reduces motion transfer between the two sides of the bed. The downside is that it tends to retain heat—which can disturb the sleep of those who sweat a lot. It is ideal for: side sleepers, people with joint pain, and couples with a weight difference.

Box spring mattress

Pocket-spring mattresses offer the best of both worlds: firm support at the base (from the springs) and softness on the surface. Each spring is encased in its own fabric and operates independently, precisely adapting to the contours of each person’s body—resulting in a softer, more personalized feel.

Soft double mattress: what should you consider as a couple?

Choosing a soft double mattress means balancing the needs of two people who may have very different sleep patterns. Here’s what to keep in mind:

• Independent support zones — the best double mattresses feature distinct zones that respond to the weight on each side independently. This way, a heavier person doesn’t cause their partner’s side to “sink”;

• Motion isolation — on a soft double mattress, motion transfer is even more noticeable than on a firm mattress, since soft surfaces tend to transmit vibrations more easily. Choose models with individually pocketed springs or high-density memory foam;

• The right size — for a couple, the recommended minimum size is 160x200 cm. For greater comfort and freedom of movement, a 180x200 cm mattress is the ideal choice;

5 signs that your mattress is too soft

We often don’t realize that the mattress is the problem. The symptoms appear gradually, and we end up getting used to them. Watch out for these signs:

• Back or neck pain upon waking: when the mattress is too soft, the lower back loses support during the night and the spine remains in a curved position for hours on end;
• You "sink" too far into the mattress: this means the mattress isn't distributing your weight properly. When your hips sink deeper than your shoulders (or vice versa), your spine isn't properly aligned;
• Difficulty changing positions during the night: an overly soft mattress "sinks" the body and hinders the natural movements we make while sleeping. If you wake up tired and feeling as though you’ve slept in the same position the whole time, this may be the reason;

• Visible indentations in the mattress: if you can see permanent indentations from your body on the mattress—even after getting up—it’s a sign that the material has lost its ability to regain its shape. In this case, the mattress isn’t just too soft: it’s worn out and should be replaced;
• Better sleep away from home: If you find that you sleep better in hotels, at relatives’ homes, or anywhere else other than your own bed, it’s time to replace your mattress.

Is your soft mattress still suitable?

If you're not sure whether your current mattress is still in good condition, try these simple tests:

• Visual test: Lie down and ask someone to check whether your spine is straight or if your lower back sags too much;
• Hand test: Slide your hand between your lower back and the mattress while lying on your back. If there is too much space, the mattress is too firm. If you can’t slide your hand in, it’s too soft;
• The test of time: if your mattress is more than 8 years old, even if it still feels comfortable, the materials may have deteriorated enough to affect the quality of your sleep.

A soft, comfortable mattress can be an excellent choice—as long as it’s suitable for your weight, sleeping position, and physical needs. The problem isn’t the softness itself, but the mattress’s lack of support.

If you recognize any of these signs, it may be time to reevaluate your mattress. The important thing is not to accept poor-quality sleep as the norm. At Mercado do Colchão, we believe that a good night’s rest starts with the details. From the mattress to the pillows, every element should provide comfort.