Mattresses Buying Guide

Independent mattress reviews for UK consumers should look past marketing language and measure what actually affects a night's sleep: firmness, motion transfer and temperature regulation, tested consistently across brands rather than taken from a spec sheet.

The UK mattress market is dominated by marketing language. Terms like 'orthopaedic', 'pocket sprung' and 'memory foam' are used inconsistently from brand to brand, and a firmness label of 'medium' from one manufacturer can feel noticeably different from another's. This guide sets out the terminology in plain English so you can compare mattresses on the same basis, whatever the packaging says.

Memory foam mattresses use layers of viscoelastic foam that soften and mould around the body in response to heat and pressure, then slowly regain their shape. They tend to isolate movement well, which suits couples with different sleep schedules, but denser foams can retain more body heat than other constructions.

Pocket-sprung mattresses use hundreds or thousands of individually wrapped springs that move independently, contouring to the body while allowing air to circulate through the coil layer. Because each spring responds on its own, pocket-sprung constructions generally perform well on motion isolation while sleeping cooler than solid foam layers of a similar depth.

Hybrid mattresses combine a pocket-sprung base with one or more comfort layers of memory foam, latex, or other foams on top. The aim is to take the support and airflow of springs and pair it with the pressure relief of foam, though how well that balance is achieved varies considerably between models.

Manufacturers typically rate mattresses on a scale from soft through medium and medium-firm to firm. There is no independent industry standard behind these labels, so a 'medium' rating from one brand is not guaranteed to feel the same as a 'medium' from another. In our reviews we measure the firmness a mattress actually delivers and assess it against the manufacturer's stated rating, rather than taking the label at face value.

As a general guide, softer mattresses allow more sinkage at the hips and shoulders, which tends to suit side sleepers who need pressure relief at those points. Firmer mattresses keep the spine in a straighter line for back and stomach sleepers, who generally need more even support along the length of the body rather than deep contouring.

'Orthopaedic' has no regulated definition when applied to mattresses in the UK. Any manufacturer can describe a mattress as orthopaedic regardless of its firmness, construction, or any clinical assessment, which means the term on its own tells you very little about how a mattress will actually support your spine.

In practice, mattresses marketed as orthopaedic are usually firmer than average, on the basis that firmer support is often associated with spinal alignment. But firmness that suits one sleeper's body weight and sleeping position can be entirely wrong for another's, so the label is not a substitute for checking the actual firmness rating and construction against your own needs.

Motion transfer is how much movement on one side of the mattress — turning over, getting in or out of bed — is felt on the other side. We assess this using a standardised weight drop test, dropping a fixed weight onto one side of the mattress and measuring the disturbance recorded on the other, so results are comparable across the mattresses we review rather than based on subjective impression alone.

Temperature regulation is assessed over an eight-hour assessment period to reflect a typical night's sleep, since a mattress that feels cool to the touch when new can behave very differently once body heat has built up over several hours. Denser foam layers with limited airflow tend to retain more heat over this period than sprung constructions or foams designed with open-cell or gel-infused structures.

• Denser memory foam layers generally retain more heat than pocket-sprung or hybrid constructions
• Breathable covers and open-cell or gel-infused foams are designed to offset heat retention, though performance varies by mattress
• Motion isolation and cooling can pull in opposite directions — a mattress optimised for one is not automatically strong on the other

UK mattress sizes follow a standard set of dimensions, though it is worth double-checking against the specific product listing, as depth and edge construction can still vary between brands even at the same named size.

Many UK mattress brands, particularly those selling online, offer trial periods of around 100 nights, reflecting the fact that it typically takes several weeks of regular use to judge whether a mattress genuinely suits you rather than just feeling different from your old one.

For mattresses bought online, the Consumer Contracts Regulations give buyers a statutory right to cancel within 14 days of delivery, separate from any extended trial period a retailer chooses to offer on top. It is worth checking whether a brand's advertised trial period is in addition to this statutory right or is being used to describe the same thing, and whether return collection and any restocking or collection fees are included.

• Check whether the trial period requires a minimum number of nights before a return can be requested
• Check who covers collection costs if you return the mattress after the trial
• Confirm whether the statutory 14-day cancellation right and the brand's trial period are the same offer or separate ones

Start from how you sleep — position and body weight — rather than the marketing category. Use the firmness rating and construction type to shortlist options, treat labels like 'orthopaedic' as marketing rather than a guarantee, and weigh motion transfer and temperature regulation against your own priorities, whether that's a partner's disturbance or overheating at night.

Finally, check the trial period and returns policy before you buy, not after — a generous trial is one of the few ways to genuinely de-risk a mattress purchase you cannot properly test in a shop.

Compare mattresses side by side → See our best mattress picks →

How long should a mattress last?

The Sleep Council recommends replacing a mattress every seven years. Quality pocket-sprung mattresses often last longer; lower-density memory foam tends to degrade faster.

Is a mattress's firmness rating the same as how firm it actually feels?

Not necessarily. Firmness ratings are set by each manufacturer with no independent standard behind them, so a 'medium' from one brand can feel softer or firmer than a 'medium' from another. We measure and report the firmness a mattress actually delivers alongside its stated rating.

Do I need an 'orthopaedic' mattress if I have back pain?

'Orthopaedic' is not a regulated or clinical term when used in mattress marketing, so it is not a reliable guide on its own. Focus on the firmness and support level appropriate to your sleeping position and body weight rather than the label, and consult a medical professional for specific back pain concerns.

Can I return a mattress if I don't like it?

Most online mattress retailers offer a trial period, commonly around 100 nights, though terms vary. Online purchases also carry a statutory 14-day cancellation right under the Consumer Contracts Regulations. Check whether collection costs are covered and whether a minimum number of nights' use is required before a return can be requested.

Does a higher price always mean a better mattress?

Not directly. Price is influenced by materials, brand positioning and marketing spend as well as genuine build quality. Our reviews assess firmness accuracy, motion transfer and temperature regulation independently of price, so a lower-priced mattress can outperform a pricier one on the measures that actually affect sleep quality.