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Quick answer: A mattress spec sheet lists the construction layers, such as spring type, foam density, latex content, firmness rating, dimensions, and weight limit. Reading it correctly means checking foam density first, aiming for 35 kg/m³ or above for lasting support, understanding spring type and count, confirming the firmness rating against how you sleep, and matching the stated dimensions to your bed frame. Five minutes spent on these four numbers will tell you more than any marketing description on the product page.

What You Need to Know Before You Start

Most first-home buyers in Singapore approach a mattress purchase the way they approach a sofa: by sitting on it briefly, reading a few online reviews, and deciding on feel. That approach works reasonably well for sofas. For mattresses, it misses the question that matters most, which is whether the materials inside will still be performing the same way in year five as they are in week one.

A spec sheet is the document that answers that question. Not every retailer presents one in the same format. Some list foam density in kilograms per cubic metre; others describe it loosely as “high-density foam” without a number. Some list spring counts per standard queen size; others list springs per zone or per square metre. The inconsistency is deliberate, in some cases. The number that is not volunteered is usually the one that competes least well against alternatives at the same price.

Before reading any spec sheet, have two things ready: the dimensions of your bed frame, or the size you intend to buy from the beds collection, and a note of your primary sleep position: back, side, or front. These two facts shape every judgment that follows.

Step 1: Find and Verify the Foam Density

Foam density is measured in kilograms per cubic metre, or kg/m³. It is the single most reliable predictor of how long a mattress holds its support. High-resilience foam at or above 35 kg/m³ maintains its structure through years of daily compression and recovery.

Foam below 25 kg/m³, common in lower-price mattresses, softens noticeably within eighteen months to two years of regular use. The surface develops body impressions that no amount of rotation fully corrects.

On a spec sheet, foam density may appear as a single figure for the comfort layer, or as separate figures for each foam layer in a multi-layer construction. Where multiple layers are listed, the density of the top comfort layer and the density of the support core are both relevant.

A high-density core with a low-density comfort layer will still sag at the surface. A high-density comfort layer over a low-density core will feel supportive initially but lose its geometry as the core compresses.

If the spec sheet lists “high-density foam” without a number, ask for the figure. If the figure is not available, treat that omission as information.

Step 2: Understand the Spring Construction

Spring mattresses fall into two main categories, and the distinction between them is practical, not merely technical.

Bonnell Spring Mattress

In a Bonnell spring mattress, the coils are connected across the unit in a continuous mesh. Compress one spring and its neighbours respond. That interconnection provides firm, even resistance across the surface, which suits heavier builds and back sleepers who want consistent pushback.

The trade-off is motion transfer: movement on one side of the bed registers across the other.

Pocketed Spring Mattress

In a pocketed spring mattress, each coil is individually wrapped in a fabric sleeve and works independently. A shoulder pressing into one zone does not move the springs beside it.

For couples on different sleep schedules, or for lighter sleepers disturbed by a partner’s movement, the independence of pocketed springs is a practical specification, not a luxury upgrade. The spring count matters here: a queen-size pocketed spring unit with fewer than 800 individual coils offers noticeably less precise contouring than one with 1,000 or above.

The spec sheet should name the spring type clearly. If it reads only “spring mattress” without specifying the coil system, that is worth clarifying before purchase.

Step 3: Check the Firmness Rating Against Your Sleep Position

Firmness ratings vary by brand and are not standardised across the industry. A “medium” on one brand’s scale may sit closer to “medium-firm” on another’s. This makes the firmness label on a spec sheet a starting point, not a conclusion.

What matters more is understanding how firmness interacts with sleep position.

Side Sleepers

Side sleepers require enough surface give to allow the shoulder and hip to settle without creating pressure points at the joint. A mattress rated medium to medium-soft generally serves this position well.

Back Sleepers

Back sleepers need even lumbar support. The lower back should neither arch into a gap above the mattress nor be pushed out of alignment by a surface that yields too quickly. Medium to medium-firm tends to hold this geometry reliably.

Front Sleepers

Front sleepers, a smaller group, typically need a firmer surface to prevent the hips from sinking and stressing the lumbar spine.

The mattress range organised by firmness at Esteller separates options clearly: soft, medium-firm, very hard, and very soft are listed separately, so the comparison is made on substance rather than impression.

The spec sheet firmness rating should be read alongside the return and trial policy, because firmness in-store and firmness after thirty nights of use are not always the same number.

Step 4: Read the Latex Layer Specification

Latex mattresses and hybrid mattresses with a latex comfort layer carry an additional specification worth reading carefully: the distinction between natural latex, synthetic latex, and blended latex.

Natural latex is derived from rubber tree sap and processed into a resilient open-cell foam that breathes well and recovers its shape consistently over time. Synthetic latex is petroleum-derived and typically cheaper, but it behaves differently under sustained compression and does not carry the same temperature-neutrality that makes natural latex suit Singapore’s climate. Blended latex sits between the two.

The spec sheet should state the latex type and the percentage composition for blended products. A latex layer described as “100% natural latex” at a given density carries more durability information than one described simply as “latex foam”.

For a hot sleeper or a household where the bedroom runs warm, the open-cell structure of natural latex is a practical consideration, not an aesthetic one.

Browse the latex mattress collection for current specifications, all listed in detail alongside firmness and size options.

Step 5: Verify the Dimensions Precisely

Mattress dimensions in Singapore follow standard sizing, but tolerances between manufacturers mean a queen-size mattress from one brand may measure 152 cm × 190 cm while another measures 153 cm × 191 cm.

For most platform beds and slatted frames, a centimetre either way sits within the frame’s tolerance. For bed frames with a fixed enclosure, a recessed base, or a storage drawer that runs to the full interior dimension, even a two-centimetre discrepancy creates a fit problem.

Measure your bed frame’s interior recess, not its outer footprint, and compare that against the mattress’s stated dimensions on the spec sheet. If the spec sheet lists only “queen size” without stated millimetre dimensions, request the precise figures before ordering.

Mattress thickness also matters for fitted sheets and for the height of the sleeping surface from the floor: a 25 cm mattress on a 35 cm platform bed base positions the sleeping surface at 60 cm, which is a different experience from a 20 cm mattress on the same base.

Current queen-size options are listed in the queen mattress collection and king-size options in the king mattress collection, each with full stated dimensions.

Step 6: Confirm the Weight Limit and Warranty

Every mattress spec sheet should state a maximum weight capacity, typically expressed per sleeping zone for double and larger sizes. A queen mattress with a 150 kg total limit supports two occupants up to a combined 150 kg. A mattress with a 150 kg per-side limit is a different specification entirely.

For heavier builds, the weight limit is a structural figure, not a guideline: exceeding it accelerates compression of both foam layers and spring tension.

The warranty term and what it actually covers are equally important. A ten-year warranty that covers only manufacturing defects above a 3 cm visible body impression offers narrower protection than it appears.

The relevant question is the threshold at which a body impression becomes a warranted defect: most manufacturers set this between 2.5 cm and 4 cm, meaning a mattress that feels noticeably softer in year three may not yet meet the claim threshold.

Esteller carries a three-year warranty across the full mattress range. That figure reflects the construction standard the materials are built to meet, and it applies without conditions that require body impressions to reach an impractical depth before they qualify.

Common Mistakes When Reading a Mattress Spec Sheet

Trusting the Firmness Label Without Checking Sleep Position

Firmness is not a universal quality. A medium-firm mattress that holds a back sleeper in correct spinal alignment may create pressure points at the hip for a side sleeper of the same weight. Read the firmness rating relative to your sleep position, not as an independent score.

Accepting High-Density Foam as a Complete Specification

The phrase carries no standardised meaning without a number. Ask for the density in kilograms per cubic metre. Below 30 kg/m³ is worth reconsidering for a primary mattress. Below 25 kg/m³ in the comfort layer is a clear signal of reduced longevity.

Ignoring the Number of Foam Layers and Their Individual Densities

A three-layer construction with a single aggregate density figure tells you little. The comfort layer, the transition layer, and the support core may each carry different densities, and the performance of the mattress depends on the sequence and relative thickness of each. Ask for a layer-by-layer breakdown where it is not provided.

Comparing Spring Counts Across Different Spring Systems

A Bonnell spring unit with 600 coils and a pocketed spring unit with 600 individually wrapped coils are not equivalent. The spring count in a Bonnell unit determines the gauge and resistance of the interconnected mesh; the spring count in a pocketed unit determines the granularity of independent contouring. The number means something different in each system.

Overlooking Thickness Relative to the Bed Frame

A mattress that is technically the correct length and width but is 8 cm thicker than the previous mattress will change the sleeping height, the reach of fitted sheets, and the visual proportion of the bed in the room. Check thickness on the spec sheet alongside the dimensions.

When to Visit the Showroom

Honestly, the spec sheet gets you most of the way there. But there is one thing a spec sheet cannot do: tell you how a particular firmness level registers under your body weight, sleep position, and temperature preference after fifteen minutes of lying still.

Foam density of 35 kg/m³ is a reliable durability indicator. It does not tell you whether the mattress is the right firmness for your lower back at your weight.

That judgment requires time horizontal on the mattress itself. Ten to fifteen minutes in the showroom, in your actual sleep position, with your shoes off, is the test no specification sheet captures. If two mattresses carry similar specs but different surface feels, the showroom visit is where the decision resolves.

The Esteller showroom at 604 Sembawang Road, #01-18 Sembawang Shopping Centre, is open daily from 10am to 10pm. The design team is available to walk through any specification question, or to compare two models side by side when the numbers on the page look similar. Reach the team ahead of your visit at +65 6348 3144 or hello@esteller.sg if you would like to confirm which models are available for testing on the day.

Frequently Asked Questions

What Is a Good Foam Density for a Mattress in Singapore?

For a primary mattress used daily, aim for a comfort layer foam density of at least 30 kg/m³, with 35 kg/m³ or above preferred for lasting shape retention.

Singapore’s heat and humidity add a secondary consideration: higher-density foam tends to retain body heat more than open-cell structures like natural latex. If temperature regulation matters, look for a mattress that combines a moderate-density foam layer with a natural latex comfort layer or a fabric cover rated for airflow.

How Many Pocket Springs Should a Queen Mattress Have?

For a standard queen size, approximately 152 cm × 190 cm, a pocketed spring count of 800 to 1,000 individual coils delivers reasonable independent contouring.

Counts above 1,000 provide finer contouring, which benefits couples with significantly different body weights or sleep positions. Counts below 700 in a pocketed unit offer less precise zone-specific support and begin to behave more like a Bonnell system in practice.

Does Mattress Thickness Affect Sleep Quality?

Thickness itself does not determine comfort or support: a well-constructed 20 cm mattress can outperform a poorly constructed 30 cm one.

Thickness matters practically for three reasons. First, it determines the sleeping height from the floor when combined with the bed frame base height. Second, it affects the fit of standard fitted sheets, most of which accommodate up to 30 cm. Third, for adjustable bases, the mattress must be within the base manufacturer’s stated thickness range to flex correctly without stressing the internal construction.

Is a Higher Spring Count Always Better?

Not always. Spring count is meaningful within the same spring system: more individually pocketed coils in a given area generally means more precise contouring. But a high spring count in a Bonnell system does not deliver independent support the way a pocketed system does, regardless of number.

The spring type and the foam layers above it together determine the sleep experience. Spring count is a useful comparison point when both mattresses use the same coil system and the same foam specification above it.

What Does the Warranty on a Mattress Actually Cover?

Warranty terms vary significantly. Most cover manufacturing defects: broken springs, foam that delaminates, fabric that fails at a seam. The critical variable is the body impression threshold: the depth at which a visible indentation qualifies as a warranted defect.

A threshold of 1.5 cm to 2 cm offers meaningful coverage for foam compression over time. A threshold of 4 cm means the mattress must have deteriorated considerably before a claim is valid. Ask for this figure specifically, and read whether the warranty is prorated, where the payout decreases over time, or full-replacement.

Conclusion

A mattress spec sheet is not difficult to read once you know which four or five figures actually carry the decision: foam density by layer, spring type and count, firmness relative to sleep position, precise dimensions, and the warranty threshold. Everything else on the page is context. The numbers are the construction; the construction is what you will be sleeping on in year four.

New pieces join the mattress collection through the year, so it is always worth a fresh look, particularly when a spec that was unavailable at a previous visit has since come into the range.

A mattress bought on clear specification knowledge holds its value and its comfort in a way that one bought on impression alone rarely does. That is the point of reading the sheet carefully before the purchase, not after.

The Esteller showroom is open daily, 10am to 10pm, at 604 Sembawang Road, #01-18 Sembawang Shopping Centre, Singapore 758459. The design team can be reached at +65 6348 3144 or hello@esteller.sg. Free delivery applies on orders above SGD 500, and Esteller’s three-year warranty covers the full mattress range.