I slept on Dormeo's plush cooling tech and loved it — here's the mattress I'd buy in its Boxing Day sale

Dormeo has become a contender in the online mattress world thanks to its Octasmart collection, a range of sleep products designed to provide advanced comfort and support. For Boxing Day, you can save up to £760 on Octasmart Deluxe Memory Foam Mattress at Dormeo — and that's excellent news for side sleepers.

Like the best mattresses on the market, the Deluxe Memory Foam Mattress features zoned support and cooling tech. It also boasts the same high quality foams as the brand's Deluxe Mattress Topper (from £499 at Dormeo), which I tested and loved when side sleeping thanks to its body-hugging feel and plush relief to my shoulders, hips and knees.

That's why I recommend side sleepers check out the Octasmart Deluxe Memory Foam Mattress in 2025's Boxing Day mattress deals. With a single as low as £439 (was £879), this is a mattress discount you won't want to miss before the year is up.

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Octasmart Deluxe Memory Foam Mattress: was £879 now £439 at dormeo.co.uk

Featuring a medium-soft feel, the Deluxe Memory Foam Mattress is recommended to anyone who needs pressure relief in the shoulder and hip region (especially side sleepers). The top layer of memory foam provides a body-cradling surface to mould to side sleeping pressure points (that's where the body presses into the bed), meanwhile, Octasmart's signature "Ecocell" foam is designed to offer a more supportive base. Making an appearance in most of the Octasmart line, the signature foam "Octasprings" are strategically placed in the Deluxe mattress to provide support where your body most needs it, such as the lower back. Plus, the trademark cooling "Octavent" system is built to be more breathable than standard memory foam.
The Octasmart Deluxe Memory Foam mattress is now £519 for a double (was £1, 039), plus it comes with a 200-night sleep trial, 20-year warranty, and free delivery.

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Who should buy the Deluxe Memory Foam Mattress and why?

I tested the Octasmart Deluxe Mattress Topper, and I was seriously impressed with the ultra-plush comfort it provides to side sleepers. As a lightweight side sleeper, I often struggle to find a mattress soft enough for me, but the cloud-like Deluxe Mattress Topper makes any hard bed marshmallow-soft.

That's why the Octasmart Deluxe Memory Foam Mattress is on my radar; looking at the design profile, it's pretty much the full-blown mattress version of the Deluxe Mattress Topper.

Featuring the same Octasprings for zoned comfort and support, an Octavent system for optimal temperature regulation, and 50% more memory foam than other Octasmart products, both the Deluxe mattress and mattress topper are designed to provide a luxuriously soft sleep surface for side sleepers.

That said, the medium-soft feel of the Deluxe Memory Foam Mattress may be too soft for back and stomach sleepers, who will likely need a firmer feel for optimal lumbar support.

Side sleepers like me, however, will love the soothing plushness.