Mattress springs: Types and which one to choose

At Sommistore, we see it every day: spring mattresses remain one of the most popular choices for those seeking a perfect balance between support, ventilation, and durability. The internal steel structure acts as the heart of the mattress, distributing weight evenly and keeping the spine aligned throughout the night. That combination of firmness and elasticity is what ensures more natural rest, free from pressure points or uncomfortable sagging.

Knowing how each type of spring works allows you to make an informed choice. Not all systems react the same way to movement, nor do they offer the same level of stability or softness. Therefore, understanding their structure is key to investing in rest with a solid foundation.

What differentiates one type of spring from another

Springs are the most traditional support system in mattresses. Their internal metal structure responds to body weight and movement, ensuring a solid base that maintains the mattress's shape over time. However, their behavior changes depending on how they are manufactured and connected to one another. Some models prioritize firmness, others prioritize adaptability, and the most modern ones combine both qualities to create a sense of balanced comfort.

In simple terms, we can divide them into three major families: Bonnell springs, continuous springs, and independent pocket springs.

Bonnell springs: classic firmness and proven stability

Bonnell springs are the most traditional system and one of the most durable bases that exist. Their structure is composed of hourglass-shaped springs linked together, creating a firm and stable surface. This type of mattress offers a compact feel, ideal for those who seek solid support and prefer a base with less sagging.

In Uruguay, it remains a reliable option due to its durability and because it provides an even feel across the entire surface. The downside is that since all the springs are connected, the movements of one person are more easily transmitted to the other. Therefore, if you sleep with a partner and one of you moves a lot, it might be worth exploring other, more modern alternatives.

Continuous springs: homogeneous support and long service life

Mattresses with continuous springs—also known as LFK springs—are manufactured from a single interlaced steel wire that forms a complete structure. This technology offers uniform firmness and excellent stability. Its main advantage is resistance: they stand the test of time well without deforming, maintaining the same level of firmness for years.

Another characteristic is that they distribute weight evenly, which is ideal for those who change positions frequently. Furthermore, since there are no connections between individual springs, the base maintains a predictable behavior, without localized sagging.

At Sommistore, we recommend this type of system to those who value firmer rest without giving up the feeling of cushioning that distinguishes spring mattresses.

Pocket springs: personalized comfort and independent movement

Mattresses with pocket springs —also called encased springs— are the result of technological evolution in rest. In this system, each spring is inside an individual sleeve, which allows it to act independently. This feature almost completely eliminates motion transfer and improves the mattress's adaptation to the body's contours.

The result is a quieter, more stable, and more comfortable rest. Each part of the body receives the level of support it needs, relieving pressure on the shoulders and hips while keeping the spine aligned. For this reason, if you sleep on your side or share a bed, pocket springs are one of the best choices.

Furthermore, their open structure promotes air circulation inside the mattress, preventing the accumulation of humidity and heat. This makes them an excellent option for the Uruguayan climate, where breathability and thermal regulation are fundamental.

How to choose based on your body and habits

There is no universal mattress. Each person needs a different level of firmness and adaptability depending on their weight, posture, and way of sleeping.

• If you sleep on your side, a mattress with pocket springs and a top layer of foam or latex is ideal. This way, the areas with the most pressure—shoulders and hips—adapt without sinking, keeping your back straight.
• If you sleep on your back, a mattress with continuous springs or firm pocket springs is recommended, as it supports the lumbar area without excessive rigidity.
• If you move a lot during the night or share a bed, pocket springs are unbeatable: each spring acts independently and prevents movement from propagating.

In all cases, the choice of firmness is key. A mattress that is too soft does not maintain correct alignment; one that is too hard prevents the body from relaxing. The ideal balance is the middle ground: firm support, a cozy feel, and constant stability.

Technical advantages of spring mattresses

Springs remain one of the most efficient support systems for several reasons:

• Dynamic support: they respond to weight and movement immediately.
• Natural ventilation: air circulates inside the mattress, maintaining a stable temperature.
• Prolonged durability: metallic materials resist mechanical fatigue for years.
• Feeling of lightness: they facilitate movement and prevent the feeling of "sinking."

At Sommistore, we combine these systems with layers of high-density technical foams, breathable fabrics, and hypoallergenic treatments. In this way, we achieve mattresses that adapt not only to the anatomy but also to each person's climate and lifestyle.

The importance of testing and choosing consciously

The ideal mattress is not defined only by the type of spring, but by how it feels when you lie down. That is why we always recommend taking a few minutes to try it out, feeling how it responds to movement and how weight is distributed across your back. The feeling of support should be immediate, without excessive pressure or localized sinking.

It is also important to consider the base. A good bed base complements the mattress's work, ensuring a firm and stable surface. If the structure gives way or is deteriorated, it can alter the rest experience, even with a new mattress.

Resting well is a technical and emotional decision

At Sommistore, we believe that choosing a spring mattress is much more than a matter of comfort. It is a decision that directly impacts health, posture, and daily energy. That is why we design products that integrate innovation, noble materials, and an approach centered on the real experience of rest.

When we understand how springs work, we realize that the true value of a mattress is not just on its surface, but inside. And when that interior is well-designed, sleeping ceases to be a routine and becomes a restorative pleasure.