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)
Certifications
Assessed from MattressNextDay's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
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 this price: hypoallergenic, vegan friendly, fire resistant to BS 7177, and made in the UK by an NBF-approved manufacturer. Starting at £259.00 for a Single, 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 & what's inside
- 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.
Who's it NOT for?
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.
MattressNextDay Super Firm Foam Mattress
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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 soft-mattress fans should steer clear.
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, with prices ranging from £259.00 to £419 depending on the size you choose.
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