The short answer#
Yes, within limits. A topper can meaningfully change the surface feel of your bed, softening a too-firm mattress, adding pressure relief, or refreshing a slightly tired one. What it can't do is fix a sagging or structurally worn mattress, because it sits on top of the problem rather than solving it. Knowing the difference saves you money.
What a topper can do#
- Soften a too-firm mattress: the most reliable use, a foam or latex topper adds give and cushioning at the surface.
- Add pressure relief: helpful for side sleepers or sore shoulders and hips that need more cushioning.
- Fine-tune comfort: useful on a guest bed or to adjust a shared mattress that's slightly too firm for one partner.
- Add a little life to a newish mattress: one that's comfortable but a touch firm or plain.
Because the firmness sweet spot for most people is medium-firm,1 a topper that nudges a too-hard bed toward that zone can genuinely improve comfort and alignment.
What a topper can't do#
- Fix sagging: if the core or springs have collapsed, a topper just follows the dip, you need a new mattress.
- Make a soft mattress firmer: toppers add softness, not support, so they can't rescue a bed that lets you sink.
- Restore lost support: long-term wear is in the core, where toppers don't reach.2
Topper or new mattress?#
If your mattress is fundamentally sound but the surface is too firm or a little flat, a topper is a cheap, effective upgrade. If it sags, lacks support, or you wake in pain despite a good surface, replace the mattress, a topper only masks the issue. For a full breakdown, see our topper vs new mattress guide.
Choosing a topper#
- Memory foam: best for pressure relief and softening a firm bed.
- Latex: responsive cushioning that sleeps cooler and lasts well.
- Wool or natural fibre: gentle comfort plus temperature regulation.
- Depth: around 5–8 cm gives a noticeable change without making fitted sheets struggle.
See our best mattress topper guide, or if it's time for a new bed, take our quiz for a personalised match.
A five-minute test: is your mattress worth topping?#
Before you spend on a topper, check the mattress underneath is sound. The whole case for a topper collapses if it is not.
- Strip the bed and lay a broom handle across it where you sleep. Measure the gap under the handle at the deepest point. Under 2cm is normal settling; 2–3cm is borderline; more than 3cm is sagging, and a topper will follow the dip.
- Press your hand into the middle and near the edge. If the middle feels noticeably softer, the core has worn unevenly.
- Ask where you hurt. Shoulder and hip pressure on waking points to a surface that is too firm, which a topper fixes. Lower back ache on waking points to sagging support, which it does not.
- Check the base. Broken or bowed slats, or a divan with a soft spot, make any mattress feel worn. Fix the base first.
- Check the age. Past eight years, most mattresses are near the end. A topper buys a year or two at best. Our lifespan guide has the full checklist.
Pass all five and a topper is a sensible buy. Fail the first or third and you need a mattress, not a topper. Our topper vs new mattress guide walks through the borderline cases.
Match the topper to the problem#
| The problem | Does a topper help? | What to buy |
|---|---|---|
| Mattress too firm; shoulder or hip pressure | Yes – the best use of a topper | 5–7cm memory foam or latex |
| Slightly firm for one partner only | Yes | A single-size topper on their half |
| Sleeping hot | Partly | Wool or latex; avoid dense memory foam, which adds heat |
| Partner disturbance | Partly | Memory foam dampens motion at the surface |
| Guest bed feels cheap and thin | Yes, cheaply | 5cm foam topper; or see below |
| Mattress too soft; sinking; back ache | No | A firmer mattress – see our firm mattress guide |
| Visible sag over 3cm | No | A new mattress |
| Worn after 8+ years | Briefly | Plan a replacement; a topper buys a year |
Topper money buys a whole mattress at the budget end#
A quality 5–7cm topper costs £80–£200 for a double. That is the entire price of several mattresses we have scored, which changes the calculation for a spare room or a child's bed.
| Model | Type | Depth | Feel | Support | Comfort | Price (double) |
|---|---|---|---|---|---|---|
| Westwood Memory Foam | Foam | 18cm | Medium | 7.8 | 8.0 | £109 |
| Core CoolMax Memory Foam | Foam | 15cm | Medium | 8.0 | 8.3 | £147 |
| Comfort Ortho Firm | Foam | 20cm | Firm | 8.6 | 7.9 | £157 |
| The Saffron Comfort Deep | Foam | 23cm | Medium | 8.3 | 8.5 | £174 |
| Superior Cashmere | Foam | 23cm | Medium | 8.5 | 8.8 | £198 |
Prices are for a double at the time of writing (September 2026), using the sale price where the brand runs a permanent one. Full scores are on each review page. We may earn a commission if you buy through our links, at no extra cost to you; it never affects a score.
For a guest bed with a tired old mattress, a £109 Westwood replaces the whole problem for topper money. For your own bed the arithmetic is different: a good topper on a sound £400–£700 mattress is still far cheaper than replacing it, and it is the right move. Our guest room guide and best under £500 collection cover both ends.
How long a topper lasts, and why cheap ones disappoint#
A topper is a comfort layer with nothing underneath it, so it wears the way comfort layers wear, which is faster than the mattress core.2 Expect two to three years from a low-density foam topper and four to five from a dense memory foam or latex one. The variable that predicts it is density: for memory foam, 50kg/m³ or more will hold its shape; 35kg/m³ will develop body impressions within a year. Retailers do not always publish density; if they will not tell you, assume it is low. Latex toppers are the most durable and sleep coolest, at a higher price. Our best topper guide rates the current options.
Three practical points people miss#
- Depth versus sheets. A 7cm topper on a 30cm mattress makes 37cm; many fitted sheets stop at 30–35cm. Check the sheet depth before buying, or budget for deep-pocket sheets.
- Protector goes over the topper, not under it, or the topper is the thing that gets stained. See our protector guide.
- Warranties. Adding a topper does not void a mattress warranty, but a topper can hide a sag developing underneath. Lift it and check every few months.
Frequently asked questions#
Do mattress toppers really work?#
Yes, for surface problems. A 5–7cm foam or latex topper reliably softens a too-firm mattress and adds pressure relief for shoulders and hips. It does not fix sagging, lost support or a mattress that is already too soft, because it sits on top of those problems.
Can a topper make a soft mattress firmer?#
Not meaningfully. Toppers add cushioning, not structure. A very firm, thin topper can make a slightly soft surface feel more even, but if you are sinking and waking with back ache, you need a firmer mattress.
How thick should a mattress topper be?#
5–7cm for a noticeable change in feel on an adult bed. Thinner (2–4cm) toppers are really mattress pads and change little; thicker (8cm-plus) ones tend to be soft, unstable and hard to fit sheets over.
Is it better to buy a topper or a new mattress?#
If the mattress is under eight years old, has no dip over 2–3cm and is simply too firm, a topper. If it sags, feels soft in the middle or you wake with lower-back ache, a new mattress. For a spare room, a £109–£200 budget mattress costs the same as a good topper and replaces the whole problem.
How long does a mattress topper last?#
Two to three years for low-density foam; four to five for dense memory foam (50kg/m³ or more) or latex. Toppers wear faster than mattresses because they are a comfort layer with no support core beneath them.
References#
- Caggiari G, Talesa GR, Toro G, Jannelli E, Monteleone G, Puddu L. What type of mattress should be chosen to avoid back pain and improve sleep quality? Review of the literature. Journal of Orthopaedics and Traumatology. 2021;22:51. doi:10.1186/s10195-021-00616-5
- Vlaović Z, Klarić N, Domljan D. Investigating the Impact of Long-Term Use on Mattress Firmness and Sleep Quality: Preliminary Results. Applied Sciences. 2024;14(21):10016. doi:10.3390/app142110016
