Firmness
Firm
Type
Foam
Depth (cm)
25
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
10
Price Range
£504 to £898
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
If you sleep best on a firm surface, or you've been advised to try one for back support, this mattress is built around exactly that. The reflex foam core gives a firm, responsive foundation, which means you'll feel held on top of the mattress rather than cradled by it. The castellated foam layer minimises motion transfer, useful if a restless partner tends to wake you. Hot sleepers get some help too: TrueGel technology is designed to regulate temperature, a common weak spot for foam. There's also a quietly reassuring set of credentials, including BS7177 fire safety conformity and National Bed Federation approval, and the Ecofoam base is naturally dust-mite resistant, a plus for allergy-prone sleepers.
Key Features & what's inside
- Microquilted cover. A micro-quilted cover gives the sleep surface a smooth, soft finish. It takes a little of the edge off an otherwise firm mattress.
- Castellated foam. This medically-proven castellated foam layer minimises motion transfer. In practice, that means less disturbance when a partner turns over in the night.
- TrueGel Technology. Komfi's naturally cooling TrueGel technology helps regulate your temperature. Foam can run warm, so this layer works against that tendency.
- Reflex Foam. A core reflex support layer provides a firm, responsive foundation. This is where the mattress gets its orthopaedic-style, on-top-of-the-bed feel.
- Ecofoam. The base is a resilient, durable Ecofoam layer made from 100% recycled and re-engineered foam. It's also naturally dust-mite resistant, which allergy sufferers will appreciate.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
This isn't the one for lovers of a soft, enveloping feel: it's firm through and through. Lightweight side sleepers may find it a little too unyielding on hips and shoulders. And if you want the reassurance of plenty of owner reviews before spending upwards of £504, the feedback here is currently very sparse.
KomfiMed Ortho Firm Mattress
How firm is the KomfiMed Ortho Firm mattress?
It's rated firm, with a reflex foam core providing a firm, responsive foundation. You'll feel supported on the surface rather than sinking in, which suits back and front sleepers, although lightweight side sleepers may find it slightly too solid for comfortable pressure relief.
Does the KomfiMed Ortho Firm come with a trial and guarantee?
Mattress Online lists it with a 100-night trial and a 10-year guarantee. Bear in mind these are that retailer's terms rather than the manufacturer's own offer, so check the conditions with whichever shop you buy from.
Is the KomfiMed Ortho Firm good for hot sleepers?
It includes Komfi's TrueGel technology, described as naturally cooling and designed to help regulate your temperature. Foam mattresses can run warmer than sprung ones, so this layer is there to counter that, though a very hot sleeper may still prefer a sprung design.
How much does the KomfiMed Ortho Firm mattress cost?
Prices range from £504 to £898 depending on size, with UK Single, Double, King and Super King available. That's a mid-range price, and the recycled Ecofoam base, UK handcrafting and TrueGel cooling layer go some way to justifying it.
How thick is the KomfiMed Ortho Firm mattress?
It's 25cm deep, built from five layers: a micro-quilted cover, castellated foam, TrueGel technology, a reflex foam support core and an Ecofoam base. That depth should work with standard fitted sheets.
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