The short answer
For most people with an aching lower back, a medium firm mattress is the best place to start: firm enough to keep the spine level, with enough give for the shoulders and hips. Side sleepers and lighter people usually need it a little softer; stomach sleepers and heavier people a little firmer. Very hard is not automatically better for your back.
Match firmness to how you sleep
The aim is a straight spine. If your hips sink lower than your shoulders the mattress is too soft; if there is a gap under your waist and pressure on your shoulder, it is too firm.
| You sleep on your | Start with | Why |
|---|---|---|
| Back | Medium firm | Supports the lower back while letting the hips settle slightly |
| Side | Medium to medium firm | The shoulder and hip need to sink in so the spine stays level |
| Stomach | Firm | Stops the hips dipping and arching the lower back |
| Different positions through the night | Medium firm | The safest middle ground for moving between positions |
Body weight changes how firm a mattress feels
The same mattress feels firmer to a lighter person and softer to a heavier one. If you are on the lighter side, go one step softer than the table suggests. If you are heavier, go one step firmer and look for a zoned spring system, which puts more support under the hips.
Couples of very different builds should look at pocket springs or latex, which respond to each person separately.
Models to try, from firm to medium
These models state their firmness or are built to be firm, so they make a useful ladder to test in a showroom.
Which brand is best for back pain?
No brand is best for every back. What matters is the construction: a medium firm feel, a spring system that is firmer under the hips (zoned or centre-reinforced), and a comfort layer such as latex that supports without sinking. Every major brand makes at least one mattress built this way.
These are the support-focused models in each brand's range at MBF Mattress. Lie on two or three of them before deciding.
| Brand | Model | What it is built around |
|---|---|---|
| Serta | Serta Support | 7-zone pocket springs with orthopaedic support foam |
| King Koil | King Koil Harmony Support | Chirotech coil system with rebound latex and a firm edge |
| Dunlopillo | Dunlopillo IcyLuxe | Medium firm (6/10), natural Dunlop latex over pocket springs |
| Dreamland | Dreamland Chiro Amethyst Sensotic | Miracoil springs with 50% more coils in the centre zone |
| Getha | Getha Intercontinental Royal I Mattress | 7 comfort and support zones in natural latex |
| Hotel Feel | Hotel Feel Pure Firm - Coconut Fibre Mattress | Firm natural coconut fibre |
Test it properly before you buy
Lie on the mattress for at least ten minutes in the position you actually sleep in, not sitting on the edge. Ask someone to check that your spine looks straight from behind when you lie on your side.
This guide is general buying advice, not medical advice. If your back pain is severe, lasts more than a few weeks, or comes with numbness, see a doctor or physiotherapist before changing your mattress.
Reading only gets you so far. Come lie on them.
Every brand in this guide is on the floor at our 21 showrooms, and a consultant is a WhatsApp message away.
























