Octasmart Deluxe Mattress Topper review 2024

The Octasmart Deluxe Mattress Topper delivers cloud-like comfort while keeping your bed cool

The Octasmart Deluxe Mattress Topper review image shows the topper placed on a grey and white mattress next to a large window
(Image: © Octasmart)

Tom's Guide Verdict

The Octasmart Deluxe Mattress Topper is a premium bed topper that delivers both excellent temperature regulation and cushioning pressure relief. The cloud-like medium-soft feel is ideal for lightweight side sleepers, but will be far too plush and unsupportive for those who sleep on their front or back. The memory foam topper does not feature any anchor straps to hold it in place, but does include a removable, machine-washable cover that provides a breathable, cool-to-the-touch surface for hot sleepers. It also comes with a two-month sleep trial, free delivery, and an eight year warranty, though some may question whether it's worth the luxury price tag.


  • +

    Ideal for lightweight side sleepers

  • +

    Excellent temperature regulation

  • +

    Delivers cloud-like pressure relief

  • +

    Comes with a removable cover


  • -

    Too soft for back or stomach sleepers

  • -

    Lacks support for heavier bodies

  • -

    No anchor straps to prevent shifting

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The Octasmart Deluxe Mattress Topper is Octasmart's most expensive mattress topper. With a medium-soft firmness level and a breathable design, this premium bed topper promises to deliver the most luxurious feel and best temperature control out of the sleep brand's topper range.

While we always recommend buying the best mattress for you, the Deluxe Mattress Topper's open-cell memory foam layers are designed for adding both plushness and cooling properties to your current bed. But does this topper live up to its promises?

For this in-depth review, we spent three weeks sleeping on the Octasmart Deluxe Mattress Topper to test it for comfort, support, and temperature regulation. Here, we'll also discuss what it's like to sleep on, its price and deals, and what other customers have to say, so you can get the full picture before deciding if the topper is right for you. 

Octasmart Deluxe Mattress Topper review in brief

After three weeks of testing, we found the Octasmart Deluxe Mattress Topper to be ideal for cooling down and softening up beds that sleep firm and warm. While it sits in the premium price bracket, it's still much cheaper than buying a full-fledged luxury bed or one of the best cooling mattresses on the market. 

The breathable smart performance cover worked well with the memory foam Octasprings to boost airflow and keep the surface fresh. While testing, we noticed the cover was cool-to-the-touch and we were able to feel the cooling properties even when the topper was covered with mattress protectors and sheets. 

In terms of comfort, this topper delivers a medium-soft firmness and body-contouring pressure relief. We felt the most comfortable when sleeping on our sides, as the top layer of open-cell memory foam cradles the body while the middle layer of  Octasprings alleviates pressure in the hips and shoulders (key pressure points when side sleeping). 

Octasmart Deluxe Mattress Topper specs

The Octasmart Deluxe Mattress Topper on a white background

(Image credit: Octasmart)

Type: Visco-elastic memory foam
Cover: Polyester; removable and machine-washable
Firmness: Medium-soft (4/10)
Straps: None
Depth: 7cm (2.75 inches)
Trial period: 60 nights
Warranty: Eight years
Sizes: Single, Double, King, Super King
Price bracket: Premium

However, we felt the topper could have been much more supportive when sleeping on our backs and stomachs. The lead tester noticed that her hips dipped when back sleeping, which sometimes lead to lower back ache. Heavyweight sleepers will also be better off with a much firmer mattress topper for extra support. Overall, we would advise back, stomach, and combination sleepers to avoid this topper and seek a medium-firm or firm topper instead.

Also, both our testers and online reviewers complained of the topper shifting, even when covered with a fitted sheet. This problem could have been fixed with the addition of anchor straps, which unfortunately are not one of the great features of this topper. However, we were pleased with the breathable, anti-allergenic cover, which is removable and machine-washable for an easy clean. The hypoallergenic cover teamed with the dust-mite resistant memory foam and cooling design makes this topper perfect for warmer months. Other perks include a generous eight-year warranty and 60-night sleep trial. 

All things considered, this mattress topper is perfect for lightweight side sleepers who are willing to invest in a premium topper that will keep them cool and fresh throughout the night. 

Octasmart Deluxe Mattress Topper: from £289 at Dormeo

Octasmart Deluxe Mattress Topper: from £289 at Dormeo
The Octasmart Deluxe Mattress Topper is a medium-soft bed topper made up of three visco-elastic memory foam layers. The middle layer features Octasmart's trademark Octaspring design to boost breathability and relieve pressure points. This is a premium topper with a premium price tag, and a double is priced at £319. There's currently no deal on this topper, but extras include a 60-night sleep trial, eight-year warranty, and free delivery. 

Octasmart Deluxe Mattress Topper review: MATERIALS

  • A 7cm topper with three memory foam layers and 100% recycled materials
  • 4cm middle layer uses Octasmart's trademark memory foam springs
  • Includes a hypoallergenic polyester cover 

The OEKO-TEX-certified topper consists of 100% recycled materials and three visco-elastic memory foam layers. The top layer is made from open-cell memory foam (its open-cell design makes the foam softer and allows better airflow) and is designed to provide plush comfort and cradle the sleeper's body. 

The middle layer boasts Octasmart's trademark Octasprings, which sit on a memory foam base layer. These memory foam springs have a patented honeycomb design (or the "Octaspring aerospace technology") which promises to be eight times more breathable than traditional foam. Along with boosted breathability, the flexible Octasprings are also designed to support the body and relieve pressure points along the hips and shoulders.

The three layers are encased inside a polyester anti-allergenic cover, which can be removed and washed at 40°C. It features built-in "comfort pockets" (puffy hexagons which Octasmart likens to tiny clouds) to create a marshmallow-like softness and better air-circulation. The smart performance cover also works in tandem with the Octaspring technology to create the "Octavent™ Air system", which is designed to cool your bed's temperature by 3°C. 

Octasmart Deluxe Mattress Topper review: Price and Deals

  • A premium bed topper with a starting MSRP of £289
  • Available at Dormeo UK
  • Includes a 60-night sleep trial and 8-year warranty

Octasmart Deluxe Mattress Topper isn't cheap. This luxury bed topper sits in the premium price bracket and has a full-retail starting price of £289 for a single. The topper is available at Dormeo, and we have yet to see a discount on the topper from this retailer. The Deluxe Mattress Topper is the most expensive of Octasmart's topper range, with the signature Octasmart Mattress Topper priced £60 cheaper for a single.  

Below are the official MSRPs for the Octasmart Deluxe Mattress Topper:

Single: £289
Double: £319
King: £389
Super King: £469

Benefits include a free delivery and 60-night sleep trial, which is pretty generous considering the minimum recommended length of time to try out a topper is around 30 nights. Plus, tied-in with the price is an eight-year warranty, which is more than enough when taking into account that toppers should be replaced every five years at a maximum. 

Octasmart Deluxe Mattress Topper review: DESIGN & FEATURES

  • 7cm triple-layer memory foam topper with a removable, washable cover
  • 4cm patented Octasprings are designed to support, cradle, and cool 
  • No anchor straps included 

The Octasmart Deluxe Mattress Topper spread out on top of a mattress

(Image credit: Future / Frances Daniels)

At 7cm thick, the Octasmart Deluxe Mattress Topper boasts three layers of memory foam and a "smart performance" cover. The top layer of memory foam has an open-cell design for a soft, breathable sleep surface. Underneath the top layer is the brand's signature Octaspring aerospace technology — a 4cm tier of patented honeycomb-shaped springs made from memory foam — which has a zoned support design that adapts to body weight and alleviates pressure from the hips, back, and shoulders. 

The Octasprings sit atop the base layer of three-dimensional permanent cell memory foam and are designed to add temperature control to your bed by working in tandem with the breathable cover. The smart performance cover, which is machine washable and anti-allergenic, can easily be removed with a zipper closure placed on the back. It's built with "hundreds of comfort pockets" (which resemble puffy little hexagons) to enhance both its medium-soft cushioning and air circulation.

While the removable, machine-washable cover is a highlight (a lot of toppers don't even come with covers, let alone removable, washable ones), a let-down is the lack of anchor straps to keep the topper from shifting. The base is said to be made from unique non-slip material to ensure the topper never moves on any surface it's placed upon, but we noticed that the topper did shift slightly. However, we only realised that it had shifted out of place when we stripped the bed sheets to reveal that the topper had moved down slightly. The shift wasn't detectable when lying in bed. 

Octasmart Deluxe Mattress Topper review: Performance

  • Medium-soft firmness is ideal for lightweight-to-average side sleepers
  • Breathable patented design should keep hot sleepers cool
  • Will be too soft for stomach and back sleepers, along with heavier bodies

We slept on the double Octasmart Deluxe Mattress Topper for exactly three weeks, testing it on temperature regulation, support and comfort, and pressure relief in accordance with our mattress methodology. We also rated set-up process.

In addition to our own experience, we combed through verified customer reviews to provide a broader look at what to expect from this mattress topper. Here's what we learned...


A box containing the Octasmart Deluxe Topper

(Image credit: Future / Frances Daniels)

Score: 5/5

The topper arrived vacuum packed in plastic and rolled up inside a shipping box, which contained just two things: the topper and a welcome booklet. We were impressed by how little packaging was used, with the only waste being the cardboard box and the plastic wrap. 

The booklet included instructions on how to set up the topper in four simple steps. The set-up process was an easy one, and should be a one-person job for anyone without physical health issues. 

The box wasn't difficult to haul up the stairs, and the instructions were easy to follow. The first steps were to place the topper on the bed, cut the packaging (no cutting utensils included), and wait 15 minutes for it to unfurl to its original shape. 

However, the topper took no time at all to take shape, and it had already expanded and covered my bed before I had time to take all of the plastic packaging off. The booklet warned that the topper may be slightly wrinkled at first, but we didn't notice any wrinkles or creases. 

The leaflet warned that, due to the visco-elastic memory foam, there may be some off-gassing (the typical odour which comes from freshly unpackaged foam) which should disappear in four to six hours if unpacked in a well ventilated area. 

However, to gauge the off-gassing level in full, we kept all the windows and doors shut so the room would be stuffy and poorly ventilated. Even with the lack of airflow, we found that off-gassing was minimal and the topper's faint smell was only noticeable if you get close to the topper while actively trying to detect a smell.

The booklet contains some contradictory information. The instruction page told us to leave the mattress to fully recover for six hours before sleeping on it, but the extra leaflet advised us to leave it a full 24 hours. While the topper looked ready to sleep on within the first hour of set up, we decided to err on the side of caution and left it to recover for one day.

Temperature regulation

A hand placed on the Octasmart Deluxe Topper to check its temperature control

(Image credit: Future / Frances Daniels)

Score: 4.5/5

We tested the topper throughout March, when the average outdoor temperature outside was around 8 °C and the indoor temperature was around 20-22°C. When we first opened the topper in a stuffy, south-facing room with lots of direct sunlight, the first thing we noticed was that the topper was cool-to-the touch, and became even cooler during the night when the temperature dropped.

We used both a quilted microfibre mattress protector and a 100% cotton fitted sheet, and were still able to feel the cooling properties of the topper's fresh surface. At no point did we feel warm, and were impressed by how the cover's "comfort pockets" delivered both air-circulating breathability and memory foam's trademark body-hugging cushioning. 

While we're not hot sleepers and can't accurately say whether it cooled our beds by 3°C as promised, we would definitely recommend it to those who want the softness of memory foam without the heat-trapping tendencies. 

Firmness and support

Score: 4/5

We rate this medium-soft bed topper as a four out of 10 on the firmness scale, making this an ultra-plush marshmallow-soft sleep surface. Its adaptive Octasprings deliever on their promise to alleviate pressure from the hips and shoulders when side sleeping, and we felt the most comfortable when sleeping in this position. Our lead tester is a lightweight combi sleeper who sleeps on both her side and back, but she found it easiest to sleep on her side when testing out the topper due to its body-cradling comfort. 

However, she found the topper to be too plush and unsupportive when sleeping on her back. The plush surface did not support the hip region (the main pressure point when back sleeping) to keep it well aligned with the spine, and she woke up a few mornings with lower back pain. 

Overall, this is definitely a mattress topper designed to add softness to a firm mattress, and it's ideal for lightweight side sleepers seeking plush body-hugging comfort and cloud-like pressure relief. However, back, stomach, and heavyweight sleepers will need something firmer for more support, while combination sleepers will prefer something with more responsiveness and ease of movement. 

Octasmart Deluxe Mattress Topper review: user reviews

As of April 2024, the Octasmart Deluxe Mattress Topper has 363 customer reviews on Dormeo, with a 4.1/5 star average. The majority of reviews (209) give a five-star rating and praised the quality, temperature control, and cloud-like comfort, which many say transformed their firm mattress. Many online reviewers with arthritis also praised the topper for easing any aches and pains.

On the flip side, those who weren't impressed with the topper shared some of our complaints. For instance, a lot of negative reviews found that the topper would be better if it had anchor bands as they noticed the topper had sided throughout the night. There was a lot of criticism about the lack of firm support, with some complaining of sore backs. 

However, some say they experienced issues which we did not experience ourselves. Some complained of premature sagging after a couple of weeks of use, while others felt the memory foam had dents and did not snap back to its original shape after pressure was applied to it. There were also some complaints about the length of delivery, with some saying it took too long to arrive. 


If you're a side sleeper seeking both body-cradling comfort and great temperature control, then this is one of the best mattress toppers for you. The patented Octaspring aerospace technology contours to your shape and relieves pressure along the hips and shoulders, which are key pressure points when side sleeping. The smart performance cover also provides a soft, cloud-like sleep surface and works with the springs to keep the topper cool and fresh for hot sleepers.

The removable, machine-washable cover made from anti-allergenic material is also a huge plus, as are the generous benefits such as a 60-night sleep trial and eight-year warranty. In terms of price, this is a premium topper that's rarely (if ever) on sale, and some customer reviews do question whether the luxury price tag truly matches the topper's quality. There's also free delivery, but lots of customers say the topper took to long to arrive. 

Stomach and back sleepers, along with those have heavier bodies, should avoid this topper as it won't provide the supportive firmness their bodies need. In fact, anyone who prefers a bouncy, responsive feel will likely be dissatisfied with the medium-soft feel and find it less easy to change positions on when combi sleeping. However, those who want a cosy, sink-in sleep surface will love this topper. 

Overall, this topper is a great option for light-to-average weight side sleepers who want to add cooling properties and softness to a firm or warm-to-the-touch mattress. 

Frances Daniels
Sleep Staff Writer

Frances Daniels is a Sleep Staff Writer at Tom's Guide and her role includes covering all mattress and sleep news, in addition to mattress reviews and buyer's guides, plus sleep accessories such as pillows and mattress toppers. Frances is a PPA-accredited journalist and is hugely interested in the relationship between good sleep and overall health. When not writing about mattresses and sleep for Tom's Guide, Frances enjoys writing about women's issues, health and wellbeing, the environment, and her native Wales.