What Is Inside a Mattress? Every Layer Explained

Short answer: A mattress is a stack. From the top down: a cover, a quilted or tufted surface construction, one or more comfort layers, sometimes a transition layer, then the support core, often with an edge system around the perimeter. A product page describes that stack. Once you can read it, much of what a product page claims becomes checkable.

This guide goes through each layer, what it does, and what to look for on a product page.

Mattress layers explained, from the top down

1. The cover, or ticking. The fabric you touch. It affects how the surface feels in the first second and, more usefully, how heat and moisture move at the sleeping surface. Product pages describe covers in various ways: a cooling cover, an organic linen fabric, or, on hand-built mattresses, a specified ticking. Some covers are removable and washable; others are fixed.
2. Quilting or tufting. How the cover is fixed to the layers beneath. Quilting stitches the cover and a thin layer of filling together in a pattern. Tufting pulls through the mattress and secures it, traditionally with felt washers, to help hold the fillings and layers securely in place. Tufting is the older method and is used on hand-built mattresses.
3. The comfort layer. This strongly influences surface feel, contouring and pressure relief, though the complete construction still matters. Comfort systems may include foam, latex, microcoils, or natural upholstery and fillings such as wool, cotton, or horsetail, depending on the construction. It is the layer most likely to be named in the product title.
4. The transition layer. Not every mattress has one. It sits between the softer comfort layer and the firmer support core and helps smooth the change between the two. Transition layers can be firmer polyfoam, latex, or microcoils, and product pages sometimes list a foam version simply as high-density foam.
5. The support core. The structural section that contributes support, stability, and resistance to excessive sinkage. This is a pocket spring unit, a firmer latex core, or a dense foam base. Some cores are zoned, varying the support across different areas of the mattress.
6. The edge system. Common edge systems include reinforced perimeter coils and foam encasement, though not every mattress uses one. It affects how the sides hold you when you sit on them, and a weak perimeter can reduce how stable or usable the surface feels near the edge.

Not every mattress has all six. An all-foam build has no spring core, a tight top has no added pillow-top or Euro top section, though it can still contain quilting and comfort layers, and some cores need no transition layer above them. The stack is a framework for reading a specification rather than a fixed recipe.

Mattress construction guide: how the layers work together?

Comfort layers influence pressure relief and how the surface feels. The support core contributes stability and support. The complete construction is what determines how a mattress performs.

Judging either part alone can be misleading. A plush comfort layer over a core contributing little can feel pleasant briefly while allowing the hips to settle further than intended. A substantial core under a thin comfort layer may support adequately and still feel hard at the shoulder.

Neither part can be judged alone, which is why comparing two mattresses by one named material rarely tells you much.

Depth is the sum of the stack, and it varies widely. A hand-built mattress may state a depth of around 21 cm with doming on top, while some deep constructions exceed 40 cm. That figure matters twice: against your frame rails, and against the pocket depth of your fitted sheets.

The top construction is separate again. A Euro top is sewn flush with the mattress edges. A traditional pillow top is attached above the main mattress body with more visible separation. A tight top has no added top section. None of these labels tells you the firmness, and the care routine depends on whether the mattress is one-sided or two-sided and on the manufacturer's instructions rather than on top style. Our guide to what the top labels mean covers that.

What sits underneath matters too. The base is not part of the mattress, but it is part of the system. Base requirements vary by manufacturer, and Englander's published warranty, for example, sets out support conditions including centre support and what may be placed over open slats.

What is this mattress made of? Reading a real spec sheet

Take any product page and answer six questions in order.

1. What is the cover? Named fabric, any cooling treatment, removable or not.
2. What is the comfort layer? The material and, where stated, the type. It might be memory foam, gel or copper-infused foam, Talalay or Dunlop latex, high-resilience foams, high-density foams, microcoils, or natural fillings such as wool, cotton or horsetail. Our guides to memory foam and latex cover what each one does.
3. Is there a transition layer? If present, it may be listed as high-density foam, latex, or microcoils.
4. What is the support core? Pocketed springs, a latex core, or foam. If springs, the count should come with the size it refers to, since a number alone is not comparable. Our pocket spring guide covers how to read one.
5. Is the core zoned? Some latex and spring cores vary support across areas of the mattress. The pattern is not standard, so check the specification rather than assuming.
6. What is the edge? Reinforced perimeter coils, foam encasement, another system, or none stated.

If a page answers all six, you can compare it against another page properly. If it answers two, that is worth knowing before you buy, and it is a fair question to put to whoever is selling it.

The parts of the stack people forget

• Air vents. Small grommets in the border on some constructions, designed to support ventilation and breathability through the mattress border.
• Handles. Side handles are for positioning and rotating, not for carrying a mattress up a stairwell. Using them to take the full weight can damage the border.
• Doming. Some hand-built mattresses are built with a slight crown on top, stated as a separate figure from the overall depth. Vispring, for example, specifies its doming separately from the mattress depth.
• One side or two. A mattress with comfort layers on one face only is rotated head to foot rather than flipped. Two-sided constructions are turned as well. This changes the care routine, so confirm which yours is.
• The encasement. Some cores sit inside a foam surround rather than having reinforced coils at the edge. Both approaches exist, and they behave differently when you sit on the side.

A reading order for a specification

This is an order for reading a product page, not a ranking of which layer matters most. No single layer decides how a mattress performs.

1. Identify the support core first, because it is the part hardest to alter later. A topper can change a surface, but it follows the shape of whatever is beneath it.
2. Then assess the comfort system. This is where much of the firmness and pressure relief comes from, and where material choice can have a direct bearing on surface temperature. Our material comparison sets the three main options against each other.
3. Then the edge. If you sleep near the edge or regularly sit on the side, test the perimeter.
4. The cover. It affects the first moments of contact and some of the surface temperature behaviour, and it is easy to overlook when comparing constructions.
5. Depth, as a constraint rather than a feature. A taller mattress is a different fit against your frame and your bedding rather than a better mattress.

Before you order

1. Ask what the support core is, before asking what the top feels like.
2. Ask whether there is a transition layer between the comfort layer and the core.
3. For a spring core, ask for the count with the size it refers to.
4. Ask whether the core is zoned, and how.
5. Check the total depth against your frame rails and sheet pockets.
6. Confirm whether the mattress is one-sided or two-sided.
7. Check the base requirements for that specific mattress.

Where to go from here

A mattress is a stack of layers, each doing a different job, and the product page is a description of that stack. Read it from the core upward rather than from the headline material down, since the core is the part hardest to change afterwards.

Because comfort preference is not generally a return reason, it is worth lying on shortlisted options in your normal sleeping position. Under The Mattress Store's refund policy, sales are final, with returns or exchanges considered for supplier defects under the policy's conditions.

Every location is on our showrooms page, including City Centre Al Zahia in Sharjah. Product pages across the mattress range include construction details that can help you compare models, and our complete guide to buying a mattress in the UAE covers the rest of the decision.

Frequently asked questions

What is a mattress made of?

A stack of layers. A cover on top, then quilting or tufting, then one or more comfort layers, which may be foam, latex, microcoils or natural fillings, sometimes a transition layer, then the support core of springs, latex or dense foam. Many mattresses also have an edge system around the perimeter to stabilise the sides.

Which mattress layer matters most?

No single layer decides it. Comfort layers influence pressure relief and surface feel, the support core contributes support and stability, and the complete construction determines how the mattress performs. The core is the part hardest to correct later, since a topper follows whatever is beneath it.

How thick should a mattress be?

There is no correct thickness. Mattress depth varies widely, from slim models under 20 cm to deep constructions over 40 cm. Check the exact product depth rather than choosing by thickness alone. What matters is whether the finished depth suits your bed frame rails and your fitted sheet pockets, so check both before ordering.

What is a transition layer in a mattress?

A layer between the comfort layer and the support core that helps smooth the change between the two. It can be firmer polyfoam, latex or microcoils. Not every mattress has one, and product pages sometimes list a foam version simply as high density foam.