MattressNextDay Super Firm Foam Mattress
The MattressNextDay Super Firm Foam Mattress is built for people who want a genuinely hard sleep surface, which is rarer than you might think.
- Extra-firm feel without sinking in
- Eases pressure at shoulders & hips
- 5-year guarantee
£259
Get the lowest price we've found
The brand describes the MattressNextDay Super Firm Foam Mattress as extra firm, so treat the name literally. Inside its 20cm depth is deep reflex foam, a springy, supportive foam that contours slightly without softening the overall feel. It's hypoallergenic, vegan friendly and made in the UK by an NBF-approved manufacturer, and it comes in UK Single, Double and King sizes. MattressNextDay backs it with a 5-year guarantee and free next day delivery to almost everywhere across mainland UK. If you sleep on your back or front and like real resistance underneath you, it deserves a look.
Mattress specifications
Firmness
Firm
Type
Memory Foam
Depth (cm)
20
Number of Layers
Trial Period (nights)
Warranty (years)
5
Price Range
£259 to £419
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
BS 7177
Assessed from MattressNextDay's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose this if firmness is the point. The deep reflex foam gently contours your body without compromising the extra firm feel, which means you get some pressure relief at your shoulders and hips while still lying on, rather than sinking into, the mattress. At 20cm deep it's slimmer than some, but that suits an all-foam build with no springs to house. The certifications are reassuring for a mattress at an affordable starting price: hypoallergenic, vegan friendly, fire resistant to BS 7177, and made in the UK by an NBF-approved manufacturer. It's a sensible way to get an extra firm feel without a heavyweight price, and the 5-year guarantee adds a little peace of mind.
Key features & layer details
Deep Reflex Foam
Deep reflex foam gently contours your body without compromising the extra firm feel, which means you get personalised pressure relief across your entire body while the surface stays supportive. Reflex foam is denser and springier than standard memory foam, so you won't feel stuck in one position.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Back sleepers
The extra firm deep reflex foam keeps you lying on top of the mattress rather than sinking in, giving steady resistance under your back.
Front sleepers
Firm, springy reflex foam resists sinking, so your hips stay supported rather than dropping into the surface while you lie face down.
Budget buyers
The copy describes it as an affordable way to get an extra firm feel, backed by a 5-year guarantee.
Allergy sufferers
The mattress is hypoallergenic, which makes it a sensible pick if you want bedding that suits sensitive sleepers.
Eco-conscious buyers
Vegan friendly materials and UK manufacturing by an NBF-approved maker suit anyone who wants to know where and how their mattress is made.
Skip this one if you like a soft, cradling feel or you sleep mainly on your side, as lightweight side sleepers in particular may find an extra firm surface puts pressure on the shoulder and hip. It's also all foam, so if you prefer the bounce and airflow of springs, look elsewhere.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
MattressNextDay Super Firm Foam Mattress
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FAQ's
How firm is the MattressNextDay Super Firm Foam Mattress?
MattressNextDay describes it as extra firm, and owner reviews suggest it lives up to that, with some buyers finding it firmer than they expected. If you want a hard, supportive surface it should suit you, but if you prefer a soft mattress, this might not be the best choice.
What is the MattressNextDay Super Firm mattress made of?
It's an all-foam mattress built around deep reflex foam, which contours your body slightly without softening the extra firm feel. It's 20cm deep, hypoallergenic, vegan friendly, fire resistant to BS 7177 and made in the UK by an NBF-approved manufacturer.
Does the MattressNextDay Super Firm mattress come with a guarantee?
Yes, MattressNextDay includes a 5-year guarantee. Delivery is free and next day to almost everywhere across mainland UK, which is handy if you need a replacement mattress quickly.
What sizes does the MattressNextDay Super Firm Foam Mattress come in?
It's available in UK Single, Double and King sizes.
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