mattresses comparison
Firm vs Medium-firm
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In short
A firm mattress lets you sink very little, so you lie more on top of it. A medium-firm mattress has some give on top and firmer support below. Many UK shops put firm at about 8–9 and medium-firm at about 6–7 on a 1–10 scale, but each shop’s scale differs. Compare within one shop.
This comparison is about mattress feel, not health. Firmness is a comfort preference. Body weight and sleep position change how firm the same mattress feels to you.
What is the difference between Firm and Medium-firm?
A firm mattress lets you sink very little, so you lie more on top of it. A medium-firm mattress has some give on top and firmer support below. Many UK shops put firm at about 8–9 and medium-firm at about 6–7 on a 1–10 scale, but each shop’s scale differs. Compare within one shop.
| Criterion | Firm | Medium-firm |
|---|---|---|
| Typical scale number | About 8–9 out of 10 | About 6–7 out of 10 |
| Surface feel | Little sink; you lie on top | Some sink at shoulders and hips |
| Body weight | Lighter people sink less, so it can feel very firm | Heavier people sink more, so it can feel softer |
| Sleep position (comfort) | Often chosen by back and stomach sleepers who want little sink | A common middle choice for back and combination sleepers |
| How it is built | Firmer springs or denser foam, thinner comfort layers | Medium-tension springs or foam with a thicker comfort layer |
| Changing the feel | A soft topper can soften the top | A topper can change the top feel a little |
Who is Firm for — and who should skip it?
- You like to lie on top of the mattress rather than in it
- You mostly sleep on your back or front
- Softer mattresses have felt too sinking for you
Who is Medium-firm for — and who should skip it?
- You want some cushioning with steady support
- You change position during the night
- Firm mattresses have felt too hard at the shoulders and hips
Frequently asked questions
What number is a firm mattress?
Many shops put firm at about 8 or 9 on a 1–10 scale and medium-firm at 6 or 7. There is no UK standard, so compare scales within the same shop.
Can I make a firm mattress softer?
A soft topper can change the top feel. It cannot change the support underneath. If the mattress is far too firm, check the shop’s trial or returns terms.
Do mattresses get softer over time?
Comfort layers often settle a little in the first weeks, so a mattress can feel slightly softer. Deep dips are different and may be a warranty issue.