Komfi Unity Deluxe Mattress

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. 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 an affordable starting 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 and mattress recycling are available for an extra charge. It's a straightforward budget buy rather than a luxury one, and the shallow 17cm profile keeps it easy to handle.

Budget buyers
The copy calls it a straightforward budget buy with an affordable starting price, while still offering a firm foam build handcrafted in the UK.

Guest rooms
With a shallow 17cm depth that is easy to handle and a firm feel, it suits a spare bed that only gets occasional use.

Bunk beds
Its slim 17cm profile is shallower than many mattresses, which means it sits comfortably within a bunk frame without leaving too little room above.

Eco-conscious buyers
The Ecofoam layer is made from recycled materials, which gives it a lower carbon footprint than standard foams while adding a softer, cradling feel.

Back sleepers
A flexible reflex foam base supports spinal alignment, which means your back stays level rather than sagging into the mattress under a firm feel.

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.

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.

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.