Firmness
Firm
Type
Memory Foam
Depth (cm)
17
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
10
Price Range
£145 to £225
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.
Value is the main draw here. From £145, you get a firm foam mattress that's handcrafted in the UK, conforms to BS7177:2008 for home use, and comes from a National Bed Federation approved brand, which is reassuring at this price. The Ecofoam layer uses recycled materials, so there's a lower carbon footprint than standard foams. Buy through Mattress Online and they list a 100-night trial and a 10 year guarantee, plus free delivery with a two-hour time slot available. Delivery to your room of choice costs £20.00 and mattress recycling £35.00. It's a straightforward, honest budget buy rather than a luxury one, and the shallow 17cm profile keeps it easy to handle.
Key Features & what's inside
- Reflex Foam. A flexible reflex foam layer that supports spinal alignment, which means your back stays level rather than sagging into the mattress. It's the backbone of the Unity Deluxe's firm feel.
- Ecofoam. Made from recycled materials, this layer lowers the mattress's carbon footprint while adding a softer, cradling comfort above the firmer base. It takes a little edge off the firmness without undermining the support.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you're a lightweight side sleeper, the firm feel may press uncomfortably on your shoulders and hips. Hot sleepers should also think twice, as some owners report it runs warm, a common trait of foam mattresses. And at 17cm deep, it won't suit anyone wanting a plush, hotel-style depth of mattress.
Komfi Unity Deluxe Mattress
Is the Komfi Unity Deluxe mattress firm or soft?
It's rated firm, so expect a supportive, stable surface rather than a soft, sinking feel. That tends to suit back sleepers and those who like sleeping on top of a mattress. Lightweight side sleepers may find it slightly too firm.
How deep is the Komfi Unity Deluxe mattress?
It's 17cm deep, which is shallower than many mattresses. That makes it easier to move and a good fit for bunk beds, guest rooms and divans, though it won't give you a deep, plush profile. Check your fitted sheets suit a shallower mattress.
Does the Komfi Unity Deluxe come with a trial and guarantee?
Mattress Online lists a 100-night trial and a 10 year guarantee with this mattress. These are the retailer's own terms, so if you buy elsewhere, check what that seller offers before ordering.
What sizes does the Komfi Unity Deluxe come in?
It's available in UK Single, UK Small Double, UK Double and UK King, priced from £145 to £225 depending on the size you choose.
Is the Komfi Unity Deluxe good for hot sleepers?
Possibly not. Some owner reviews mention it runs hot, which is common with foam mattresses. If you tend to overheat at night, a breathable sprung mattress may serve you better, or plan on breathable bedding to help.
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