Your mattress is five years old. It’s not terrible — no springs poking through, no visible sag — but you wake up stiff every morning, your shoulder aches, and the memory foam that once cradled you now feels like lying on a warm slab of pavement. Replacing the whole mattress costs £400-800. A mattress topper costs £40-150. The question is: will a topper actually fix your problem, or is it just a £100 plaster over a mattress that needs replacing?
In This Article
- What Is a Mattress Topper?
- Mattress Topper vs Mattress Protector
- When a Topper Will Help
- When a Topper Won’t Help
- Types of Mattress Topper
- Thickness Guide: How Thick Should Your Topper Be?
- Firmness and Sleeping Position
- Topper Sizes and UK Mattress Dimensions
- How to Stop a Topper from Sliding
- Caring for Your Mattress Topper
- Best Mattress Toppers by Budget
- Frequently Asked Questions
What Is a Mattress Topper?
A mattress topper is a thick layer of cushioning material — usually between 2.5cm and 10cm — that sits on top of your existing mattress. You put it under your fitted sheet, and it changes the feel of the sleeping surface without replacing the mattress itself.
Think of it as a major upgrade to the top layer of your bed. If your mattress is too firm, a soft topper makes it plusher. If it’s too warm, a breathable topper helps with airflow. If it’s developing body impressions, a topper can level the surface and buy you another couple of years before you need a full replacement.
They’re not magic. A topper can change the comfort layer — the bit you feel against your body — but it can’t fix structural problems deeper in the mattress. More on that distinction shortly.
Mattress Topper vs Mattress Protector
These get confused constantly. They’re completely different products.
Mattress Topper
- Thick (2.5-10cm)
- Changes the feel of your mattress
- Goes under your fitted sheet
- Costs £40-200
- Designed for comfort and support adjustment
Mattress Protector
- Thin (a few millimetres)
- Protects the mattress from spills, sweat, dust mites
- Also goes under the fitted sheet (under the topper if you use both)
- Costs £10-30
- Designed for hygiene, not comfort
If you’re buying a topper, you should still use a mattress protector underneath it. The protector goes directly on the mattress, then the topper, then your fitted sheet. This keeps both the mattress and topper clean.
When a Topper Will Help
A topper is the right solution in specific situations. If your problem matches one of these, you’ll likely see a real improvement.
Your Mattress Is Too Firm
The most common reason people buy toppers. A memory foam or microfibre topper adds a soft layer on top of a firm mattress, giving you the cushioning your body needs at pressure points — shoulders, hips, and knees. I added a 5cm memory foam topper to a rock-hard pocket sprung mattress we’d bought from John Lewis that was technically “medium-firm” but felt like sleeping on a table. The difference was immediate — same support underneath, but my hip stopped aching within a week.
Your Mattress Is Getting Body Impressions
After 5-7 years, most mattresses develop slight dips where you sleep. A topper sits on top of these impressions and creates a fresh, flat surface. This is a temporary fix — the underlying mattress is still degrading — but it can extend the usable life by a year or two.
You’re Sleeping Hot
If your mattress retains heat (common with memory foam), a cooling topper made from natural materials like wool, cotton, or latex can improve airflow and temperature regulation. Our cooling duvets guide covers the bedding side of the equation, but the topper underneath you often matters more.
You Want to Test a Different Feel
Not sure whether you prefer memory foam or latex? A topper lets you experiment for a fraction of the cost of a new mattress. If you hate it, you’ve lost £60 instead of £600.
Your Mattress Is Fine But Your Guest Bed Isn’t
A topper on the spare room mattress is the cheapest way to make guests comfortable without buying a new mattress they’ll sleep on three times a year.
When a Topper Won’t Help
There are situations where a topper is a waste of money, and you need to replace the mattress instead.
Your Mattress Has Visible Sagging
If the mattress sags more than 3-4cm in the middle (put a broomstick across it — if there’s a gap bigger than your fist, it’s sagging), a topper will just sink into the same dip. You’ll feel the sag through the topper. The internal support structure has failed, and only a new mattress fixes that.
Your Mattress Is Over 8-10 Years Old
The Sleep Charity recommends replacing mattresses every 7-8 years. If yours is past that point, a topper is delaying the inevitable. The springs, foam, or latex have degraded beyond what a surface layer can compensate for.
You Can Feel Springs Through the Surface
Broken or worn springs are a structural failure. A topper might mask the worst of it temporarily, but you’ll still feel uneven support. This is a mattress that needs replacing.
Your Mattress Is Too Soft
This is counterintuitive, but a topper rarely helps a mattress that’s too soft. Adding more material on top of an already soft mattress usually makes it softer. What you need is a firmer mattress, not another layer. The one exception is a firm latex topper, which can add some structure — but it’s not ideal. You’re better off with a new mattress that matches your firmness preference.
Types of Mattress Topper
Memory Foam
The most popular type in the UK. Memory foam moulds to your body shape under heat and pressure, creating a personalised cradle.
- Best for: Side sleepers, people with joint pain, those who want a “hugging” feel
- Pros: Excellent pressure relief, widely available, good value
- Cons: Retains heat (a significant drawback in summer), initial off-gassing smell (usually fades in 48-72 hours), slow response to position changes
- Price range: £30-120 for a double
- Brands to look for: Panda (bamboo-infused, about £80), Emma (about £110), Silentnight (about £40-60 from Argos)
Latex
Natural or synthetic rubber foam. Bouncier and more responsive than memory foam — it springs back immediately when you move.
- Best for: People who toss and turn, those who dislike the “stuck in” feeling of memory foam, hot sleepers (latex breathes far better than memory foam)
- Pros: Naturally cool, responsive, durable (lasts longer than memory foam), hypoallergenic
- Cons: More expensive, heavier, limited availability on the UK high street
- Price range: £80-200 for a double (natural latex is at the higher end)
- Brands to look for: Dunlopillo (about £150, long-established UK brand), John Lewis own-brand latex topper (about £100)
Microfibre / Hollowfibre
Synthetic filling that mimics the feel of natural down. Soft, puffy, and usually the cheapest option.
- Best for: Budget buyers, guest beds, adding plushness to a firm mattress
- Pros: Cheap, machine washable, lightweight, no off-gassing
- Cons: Flattens over time (typically 1-2 years before it loses loft), poor support compared to foam or latex, can clump
- Price range: £20-50 for a double
- Brands to look for: Silentnight (about £25 from Argos), Slumberdown (about £20-30)
Feather and Down
Traditional luxury option. Natural feather and down filling provides a cloud-like softness.
- Best for: People who want a hotel-bed feel, cold sleepers (down is excellent insulation)
- Pros: Supremely soft, excellent temperature regulation, long-lasting if maintained
- Cons: Expensive, requires regular shaking/plumping, not suitable for allergy sufferers, feathers can poke through the casing
- Price range: £80-250 for a double
- Brands to look for: The White Company (about £170-250 — premium but excellent quality), John Lewis goose down topper (about £120-180)
Wool
Natural temperature regulation — warm in winter, cool in summer. The British Wool organisation promotes UK-sourced wool bedding, and several British manufacturers use British fleece.
- Best for: Year-round comfort, eco-conscious buyers, allergy sufferers (wool is naturally hypoallergenic and dust-mite resistant)
- Pros: Temperature regulating, moisture-wicking, naturally fire-resistant (no chemical treatments needed), sustainable
- Cons: Expensive, limited softness compared to down or memory foam, heavier
- Price range: £100-250 for a double
- Brands to look for: Devon Duvets (about £150-200, British-made), Woolroom (about £120-180)
Thickness Guide: How Thick Should Your Topper Be?
2.5cm (1 inch)
Minimal change. Adds a thin comfort layer but won’t transform a firm mattress. Good for minor adjustments or protecting a mattress surface. Most people find this too thin to make a noticeable difference.
5cm (2 inches)
The sweet spot for most people. Thick enough to noticeably change the feel of your mattress, thin enough that your fitted sheet still fits without drama. If you’re unsure which thickness to get, start here.
7.5cm (3 inches)
Substantial cushioning. Transforms a firm mattress into something much softer. Good for significant comfort changes, but be aware your bed height increases noticeably and your fitted sheet may not fit without a deep-pocket version.
10cm+ (4 inches)
Essentially a second mattress on top of your mattress. Only necessary if you’re trying to completely change the sleeping surface. At this thickness, you should probably just buy a new mattress — the cost difference shrinks and you get better integrated support.
The Fitted Sheet Problem
Thicker toppers mean a deeper bed. A standard UK fitted sheet fits a mattress depth of about 25-28cm. If your mattress is 25cm deep and you add a 7.5cm topper, you need a sheet that fits 32.5cm+ depth. Deep-pocket or extra-deep fitted sheets are widely available — Dunelm, John Lewis, and Amazon all stock them — but check before your topper arrives. Our thread count guide covers choosing sheets alongside other bedding.
Firmness and Sleeping Position
Your sleeping position determines which firmness of topper will help most.
Side Sleepers
Need pressure relief at the shoulder and hip. A softer topper (memory foam or down) that allows these points to sink in while supporting the waist is ideal. Side sleepers benefit most from toppers because the main mattress provides base support while the topper cushions pressure points.
Back Sleepers
Need even support across the whole spine. A medium-firm topper works best — soft enough to be comfortable, firm enough that the lower back doesn’t sag. Latex is often ideal for back sleepers because it provides support and bounce without the “sinking” sensation of memory foam.
Stomach Sleepers
Need a firmer surface to prevent the hips sinking too far forward, which strains the lower back. A thin (2.5-5cm), firm topper — or no topper at all — is usually best. Thick, soft toppers are the worst choice for stomach sleepers.
Combination Sleepers
If you move between positions during the night, latex is your best bet. Its responsiveness means it adjusts immediately as you roll over, unlike memory foam which takes a moment to reshape. A 5cm latex topper at medium firmness covers all positions reasonably well.
Topper Sizes and UK Mattress Dimensions
Make sure your topper matches your mattress. UK sizes differ from European and US sizes — don’t order based on a generic “double” description without checking measurements.
- Single: 90 x 190cm
- Double: 135 x 190cm
- King: 150 x 200cm
- Super King: 180 x 200cm
Some toppers come in “small double” (120 x 190cm) or “EU single” (90 x 200cm) — these won’t fit standard UK beds properly. Always check dimensions, not just the size name, especially when buying from Amazon sellers who may list European sizes.
How to Stop a Topper from Sliding
A topper that shifts during the night defeats the purpose. This is the most common complaint, especially with memory foam toppers on smooth mattress covers.
Solutions
- Topper straps — elastic bands with corner clips (about £8-12 from Amazon). These work well and are the most popular solution
- Non-slip mat — a thin rubber grip mat between the mattress and topper. Cut a roll of non-slip drawer liner from any pound shop to size
- Deep-pocket fitted sheet — a sheet that wraps around both the topper and mattress holds everything together
- Topper with its own cover — some toppers come with a zipped cover that has a non-slip base. Panda and Emma toppers both have this feature built in
The strap method is the cheapest and most reliable. I’ve tried all four and the straps are what we use — they’ve held the topper in place for two years without issue.
Caring for Your Mattress Topper
Memory Foam
- Don’t machine wash — water damages the foam structure permanently
- Air it out monthly — strip the bed and let it breathe for a few hours
- Spot clean with a damp cloth and mild soap
- Rotate it 180° every month to even out wear
- Keep it dry — use a mattress protector underneath
Latex
- Don’t expose to direct sunlight — UV breaks down latex over time
- Spot clean only
- Rotate quarterly
- Latex lasts 5-8 years with proper care — longer than any other topper material
Microfibre / Down
- Most are machine washable (check the label) — wash at 40°C, gentle cycle, low tumble dry
- Shake and plump weekly to maintain loft
- Replace every 1-2 years as filling compresses
Wool
- Spot clean or professional dry clean only
- Air regularly in a well-ventilated room
- Wool is naturally odour-resistant and self-cleaning to an extent
- Lasts 3-5 years with care
Best Mattress Toppers by Budget
Under £50
- Silentnight Airmax Topper (about £30-40, double): Decent microfibre topper with mesh sides for airflow. Won’t transform your bed but adds comfort at rock-bottom cost. Available from Argos and Amazon
- Slumberdown Climate Control (about £25-35): Budget hollow fibre with temperature-regulating fabric. A solid guest bed upgrade
£50-100
- Panda Bamboo Memory Foam Topper (about £80, double): 5cm memory foam with bamboo-rayon cover. Sleeps cooler than standard memory foam. One of the best mid-range options available in the UK
- Silentnight 5cm Memory Foam (about £60, double): Simple, well-made memory foam topper from a trusted UK brand
£100-200
- Dunlopillo Latex Topper (about £150, double): Natural latex from a long-established brand. Responsive, cool, durable. The best topper material for the money
- Emma Mattress Topper (about £130, double): Airgocell foam, cooler than standard memory foam. Comes with a removable, washable cover
- John Lewis Goose Feather & Down Topper (about £130, double): Hotel-level luxury. Supremely soft, excellent for cold sleepers
£200+
- Devon Duvets British Wool Topper (about £180-220, double): Handmade in Devon with British fleece. Temperature-regulating, sustainable, built to last years
- The White Company Hungarian Goose Down Topper (about £200-250, double): The premium option. Cloud-like softness, exceptional quality. A genuine luxury purchase
Frequently Asked Questions
Do mattress toppers make a bed softer or firmer? Most toppers make a bed softer — memory foam, microfibre, and down all add cushioning. If you want to make a bed firmer, look specifically for a firm latex topper. These are less common but do exist, and they’re the only topper type that adds meaningful firmness.
How long do mattress toppers last? It depends on material. Memory foam: 3-5 years. Latex: 5-8 years. Microfibre: 1-2 years. Down/feather: 3-5 years with regular plumping. Wool: 3-5 years. If your topper has flattened and no longer springs back, it’s time to replace it.
Can a mattress topper help with back pain? It can if the pain is caused by pressure points (a mattress that’s too firm) or poor spinal alignment (sleeping in a dip). A memory foam or latex topper redistributes your weight and can relieve pressure. However, if your back pain is caused by a mattress that’s too soft or structurally collapsed, a topper will make it worse. See a physiotherapist if back pain persists regardless of your mattress setup.
Should I put a mattress protector over or under the topper? Under the topper (directly on the mattress). This protects the mattress from moisture that passes through the topper. Some people add a second thin protector over the topper too — useful if you have young children or pets on the bed.
Will a topper fit under my fitted sheet? A 2.5-5cm topper usually fits under a standard fitted sheet on most mattresses. Anything thicker (7.5cm+) will need a deep-pocket fitted sheet — typically rated for 30-38cm depth. Check your mattress depth, add the topper thickness, and buy sheets accordingly.