What a mattress topper can and can't do#

A mattress topper is a removable layer (typically 2–8 cm thick) that sits on top of your mattress. It can change the surface feel, add cushioning and extend the life of a mattress that is otherwise in good condition. However, a topper cannot fix structural problems. If your mattress is sagging, has worn-out springs or has lost its core support, adding a topper is like painting over damp, it masks the problem temporarily without solving it.

When a mattress topper is the right choice#

  • Your mattress is in good structural condition but the surface feel isn't quite right for you (e.g., too firm after buying a medium-firm mattress)
  • You're staying in rented accommodation with a mattress you can't change
  • You want to add a cooling layer to a mattress that sleeps warm
  • You want to protect a new mattress while keeping a softer surface feel
  • You want to buy time before replacing a mattress that is starting to show age but is still functional

When you need a new mattress#

  • Visible sagging or body impressions deeper than 3 cm
  • Springs you can feel through the mattress or that make noise
  • Waking up with pain that improves during the day, this suggests poor support
  • The mattress is more than 8–10 years old and noticeably less comfortable than when new
  • Significant hygiene concerns (moisture damage, persistent odours, mould)

The cost comparison#

A quality mattress topper costs £50–£300. A new quality mattress costs £400–£1,000+. If your mattress has structural issues, spending £150 on a topper is money wasted, it will not solve the problem and you'll still need a new mattress within a year or two. If the mattress is structurally sound, a good topper can add several more years of comfortable use for a fraction of the cost of replacing.

The best mattress toppers available in the UK#

If you decide a topper is the right choice, look for:

  • Memory foam toppers (4–8 cm): Best for pressure relief and softening a firm mattress
  • Natural latex toppers: More breathable and responsive than memory foam, but more expensive
  • Wool or feather toppers: Good temperature regulation, luxurious feel, require a mattress protector underneath
  • Gel foam toppers: Cooler than standard memory foam

Key brands to consider: Emma Topper, Simba Foam Topper, Woolroom, and the John Lewis Natural Collection range.

The budget end changes the maths#

The cost comparison above assumes a new mattress costs several hundred pounds. It need not. A quality topper is £80–£200; so are these mattresses.

ModelTypeDepthFeelSupportComfortPrice (double)Why it is here
Westwood Memory FoamFoam18cmMedium7.88.0£10918cm foam; a spare-room solution for £109
Core CoolMax Memory FoamFoam15cmMedium8.08.3£147Wicking cover for a warm sleeper
The Saffron Comfort DeepFoam23cmMedium8.38.5£17423cm; a real main-bed depth
Superior CashmereFoam23cmMedium8.58.8£198The one we would buy instead of any £200 topper

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 spare room or a child's bed, replace rather than top. For your own bed on a sound £400–£1,000 mattress that is merely too firm, a topper is the right call and far cheaper. Our topper guide rates the current options.

Frequently asked questions#

Is a mattress topper cheaper than a new mattress?#

Usually, but not always. A good 5–7cm topper is £80–£200 for a double, and several full mattresses we have scored cost £109–£198. For a spare room, the mattress is the better buy; for a sound main-bed mattress, the topper.

Will a topper fix a sagging mattress?#

No. A topper follows the shape of what is under it, so a dip of more than 2–3cm shows through within weeks. Sagging means replacement.

Can a topper extend the life of a mattress?#

By a year or two, if the mattress is sound but its comfort layer has softened. It cannot revive a mattress whose support core has gone.

Is it worth putting a topper on a new mattress?#

Only if the new mattress is slightly too firm and you would rather not return it. Otherwise, no; you are paying twice for a comfort layer. Use the trial to get the firmness right instead.