Does firm mean firm springs or a firm surface?

Shop labels mix both. Ask whether "firm" means spring tension and wire thickness, or the quilt and padding on top. On many pocket sprung and hybrid beds, these are separate specs you can pick independently.

What spring tension do I need for my weight?

Heavier sleepers usually need higher tension (thicker wire, firmer unit) so they do not sink through the top layers. Lighter sleepers on an overly firm unit may feel pressure on top. Exact gauges vary by maker — use weight as the first filter, then sleep position for top feel.

Can a soft topper fix the wrong spring tension?

A topper only changes top feel. If the spring unit is too soft for your weight, a topper will not fix alignment. If the unit is too firm, a soft topper can help pressure relief but will not change the spring gauge.

mattresses

Spring Tension vs Comfort Feel

Entity: spring tension versus comfort feel

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

Spring tension is how hard the spring unit pushes back. Wire thickness and coil shape set it. It should match your body weight. Comfort feel is how soft the padding and foam on top feels. Firm springs can sit under a soft quilt. Mixing up these two specs causes many early buyer regrets.

Educational diagram splitting a mattress into spring tension layer for body weight and comfort layers for surface feel — Tension supports body mass. Comfort layers decide plushness. Soft/medium/firm labels often blur the two.

Materials used

steel pocket springs
wire of varying gauges
wool cotton foam comfort layers

Average lifespan

7– 10 years

Two different specs

Spec	What it is	Set by	Choose mainly by
Spring tension	How hard the spring unit pushes back	Wire gauge, coil shape	Body weight
Comfort feel	How soft the sleep surface feels	Wool, foam, latex, quilt depth	Sleep position and what you like

Why weight comes first for pocket sprung beds

Too soft a unit for a heavy sleeper → you sink through the top. It feels “saggy” even when new.
Too firm a unit for a light sleeper → you sleep on top. Shoulders and hips can ache.

Then set top plushness with fillings — see natural fillings and pillow-tops.

Tension bands (education only, not brand rules)

Each maker publishes its own charts. In UK pocket sprung education, thicker wire / firmer tension often links to higher body weight bands. Medium tension often suits mid-range adult weights. Always read the maker’s weight guide for that model.

Couples with different weights

One shared tension is always a compromise. Options: zip-and-link dual tension, zoned units, or accepting a middle tension with top tuning.

Frequently asked questions

Does firm mean firm springs or a firm surface?: Shop labels mix both. Ask whether "firm" means spring tension and wire thickness, or the quilt and padding on top. On many pocket sprung and hybrid beds, these are separate specs you can pick independently.
What spring tension do I need for my weight?: Heavier sleepers usually need higher tension (thicker wire, firmer unit) so they do not sink through the top layers. Lighter sleepers on an overly firm unit may feel pressure on top. Exact gauges vary by maker — use weight as the first filter, then sleep position for top feel.
Can a soft topper fix the wrong spring tension?: A topper only changes top feel. If the spring unit is too soft for your weight, a topper will not fix alignment. If the unit is too firm, a soft topper can help pressure relief but will not change the spring gauge.