Firmness
Type
Memory Foam
Depth (cm)
Number of Layers
2
Trial Period (nights)
200
Warranty (years)
20
Price Range
£309 to £479
Best Sleeping Position(s)
Certifications
Assessed from Dormeo's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is the combination of a genuinely long safety net and a distinctive construction. A 200-night trial gives you two full seasons to decide, and the 20-year guarantee is unusually generous. Dormeo says this model has 50% more memory foam than its Octasmart Plus, which means a deeper, more cushioned surface feel, and claims the Octavent Air System makes it 8x more breathable, worth knowing if warm foam mattresses have put you off before. The anti-allergenic cover is a quiet plus for allergy sufferers. Delivery is free within the UK, with most orders arriving within 14 days, though it can stretch to 28 days when demand is high.
Key Features & what's inside
- Memory Foam Top Layer. A top layer of memory foam that moulds to your shape, which means the surface cradles your body rather than pushing back against it. Expect that slow, sinking-in feel memory foam is known for.
- Octaspring Technology with Body Zones. Hundreds of Octasprings adapt three-dimensionally to ease pressure at the back, hips and shoulders, so support shifts as you move rather than staying rigid. Three Body Zones mean each area of your body gets a comfort point tuned to it.
Layer details from dormeo.co.uk product page, September 2026.
Who's it NOT for?
This is a Medium/Soft mattress, so it is not the best pick if you sleep on your stomach or are a heavier sleeper who needs a firmer surface to keep the spine level. If you dislike the hugging, slow-response feel of memory foam, look at a traditional sprung model instead.
Dormeo Octasmart Premium Deluxe Mattress
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How firm is the dormeo octasmart premium deluxe?
Dormeo describes it as Medium/Soft. In practice that means a gentle, cushioned surface where you sink in slightly rather than lie on top, which tends to suit side sleepers and lighter builds. If you prefer a firmer feel, this probably is not the one.
Does the dormeo octasmart premium deluxe have a trial period?
Yes. Dormeo offers a 200-night trial when you buy from their site, which gives you several months at home to decide. That matters with memory foam, as it can take a few weeks for your body to adjust to a new feel.
How long is the guarantee on the dormeo octasmart premium deluxe?
Dormeo lists a 20-year guarantee on this mattress, which is longer than most brands offer and suggests some confidence in how the Octaspring construction holds up over time.
Does the dormeo octasmart premium deluxe sleep hot?
Dormeo claims its Octavent Air System makes the mattress 8x more breathable, as the hollow Octasprings allow air to move through the core. Memory foam tops can still feel warmer than traditional sprung surfaces, so very hot sleepers should weigh that up during the trial.
What sizes does the dormeo octasmart premium deluxe come in?
It is available in UK Single, Double and King, with prices ranging from £309 to £479 depending on the size. There is no Small Double or Super King listed at present.
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