What are the main layers inside a mattress?

Most beds have a cover, one or more comfort layers, and a support core. The core may be pocket springs, open coils, foam or latex. Some beds also have edge foam and a thin insulator above the base.

Does a thicker mattress mean better quality?

Not always. Extra thickness can be soft padding, not stronger support. Read what the core is made of, then how thick the comfort layers are, then the total height.

mattresses

What’s Inside a Mattress

Entity: mattress construction layers

Neat mattress with turned-down sheets on an upholstered bed in soft daylight — How a finished mattress and bedding stack can look once the bed is made.

In short

Most mattresses stack layers: a cover, comfort padding, and a support core. Pocket sprung and hybrid beds use steel springs in the core. Foam and latex beds use foam blocks instead. Edge foam, quilting and fire barriers may sit around or under those layers. Knowing the stack helps you read shop labels without guessing.

Educational cross-section of a mattress showing cover, comfort layers, support core and base layer — In short: cover on top, comfort in the middle, support at the core.

Materials used

cover fabric
foam or fibre comfort layers
pocket springs or foam core
edge support foam

Average lifespan

6– 10 years

The simple stack

Layer	Job
Cover	The fabric you touch. May be quilted.
Comfort layers	Foam, latex, wool or fibre that set soft or firm top feel
Support core	Springs or firm foam that hold your weight
Base / insulator	Thin layer that sits toward the bed base

Spring beds versus foam beds

Pocket sprung and hybrid beds use a spring core.
Memory foam and many all-foam beds use foam as the core.
Latex can be a core or a comfort layer.

Labels to read next

Core type (springs or foam)
Spring tension vs top feel
Foam density if the bed is foam
Total depth for fitted sheets

Frequently asked questions

What are the main layers inside a mattress?: Most beds have a cover, one or more comfort layers, and a support core. The core may be pocket springs, open coils, foam or latex. Some beds also have edge foam and a thin insulator above the base.
Does a thicker mattress mean better quality?: Not always. Extra thickness can be soft padding, not stronger support. Read what the core is made of, then how thick the comfort layers are, then the total height.