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Simba hybrid pillow review: Is it really the best pillow for every type of sleeper?

From eco-credentials to suitability for side-sleepers, we put the feather-foam hybrid to the test

Liz Dodd
Sunday 16 May 2021 13:13
<p>The adjustable pillow has Nasa-derived technology to keep you warm or cool while you sleep</p>

The adjustable pillow has Nasa-derived technology to keep you warm or cool while you sleep

If a pillow has ever made you feel like the princess and the proverbial pea, forcing you to constantly flip sides when you overheat or relentlessly fluff up tired feathers to ward off neck ache, Simba’s hybrid pillow could be the solution to your restless nights.

The main thing to know about this foam pillow is that it’s not a memory foam pillow: as the name implies, it’s a hybrid between a traditional down or feather filled pillow (because it’s stuffed with lots of little cubes) and a foam pillow.

As a result, it claims to represent the best of both: it has the loft and comfort of a feather fill, and the support and firmness of foam. Because it’s so adjustable – you can just add, remove, or move the nanocube fill as you like – it claims to be suitable for any kind of sleeper. And it boasts Nasa-derived technology to keep you warm or cool while you sleep.

We tested Simba’s claims by using this pillow as our main pillow for 10 months, spanning a hot summer and a cold winter. As well as sleeping on it, we used it to work-from-bed occasionally – a pandemic lockdown luxury.

We reviewed this pillow for comfort, both in terms of fill and firmness, but also how well it adjusts to different temperatures.

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We tested it to see if Simba’s claim that it can be used in any sleeping position is true. Finally we considered how easy it was to care for, how environmentally-friendly it is, and how suitable it is for people with allergies.

You can trust our independent reviews. We may earn commission from some of the retailers, but we never allow this to influence selections, which are formed from real-world and expert advice. This revenue helps us to fund journalism acrossThe Independent.

Simba hybrid pillow

Buy now £99,


Simba says the pillow is filled with “nanocubes” and uses “nanocube technology” to give you the perfect night’s sleep. But what does that mean? Unlike older pillows that use memory foam (usually made from a polymer known as polyurethane), Simba’s nanocubes are made from open-cell foam made up of lots of tiny sealed cells filled with air. They compress and bounce back with real spring, which makes the pillow feel more like a traditional feather or down fill, and less like you’re sleeping on a wedge of plastic.

In terms of firmness, it feels somewhere between a feather pillow and a memory foam pillow: the closest comparison we found was with a natural fibre like wool. There is plenty of support, particularly if you retain all the nanocubes and fluff them up occasionally, and your head doesn’t sink all the way to the mattress the same way it would with a down fill. But there is always a degree of give, which is particularly nice if you sleep on a firmer mattress and on your side (so you have a very low pillow).


Sure, this pillow doesn’t have the sumptuous, hotel-style plumpness of a fully-lofted down pillow. But it also won’t give you chronic neck ache. The nanocube fill is a triumph: it is really comfortable and squishy. But where this pillow also shines is its climate control. Its two sides are made from different materials, and the turquoise bordered side uses a technology developed by Nasa that Simba calls “stratos”. Microcapsules applied to the cover absorb, store and release body heat depending on how warm or cold you get.

The other side, with a silver border, is made from ethically-sourced, breathable cotton. You can spot the difference between the two surfaces, but with a pillowcase on, you won’t feel any difference in texture. Our reviewers naturally gravitated to the climate-controlled blue side and never had an uncomfortable night’s sleep.

The thick mesh stripe that runs around the middle of the pillow keeps air circulating around the cubes, which contributes to the coolness.

Sleeping position

The amount of lift you get from this pillow is entirely customisable because you can move the cubes – or they seem to naturally drift – to where you most need them. You can even remove whole handfuls. So when Simba says this pillow is for every sleeping style, they’re not exaggerating.

Our reviewer, a side-front sleeper, moved most of the nanocubes from the base of the pillow to the top to give her a wedge-shaped pillow with a low profile at the neck. Front sleepers might like to remove some of the nanocubes to drop the height even more, while back sleepers can retain all the nanocubes, and might like to open the pillow and move them around every week or so to keep maximum loft all over.

Adjusting the cubes is really simple: unzip the outer cover, then the inner cover, reach in and mess them up.


The synthetic fill makes this pillow ideal for anyone who suffers with allergies and can’t sleep on a natural or traditional fill. The microfibre layer that sits between the cubes and the cover is also hypoallergenic, and the cover is really easy to take off and wash.

Eco friendliness

Old-fashioned memory foam is shockingly bad for the environment, so it’s good to see that Simba are trying to innovate in this area as well. The foam used to make the nanocubes is produced without TCPP and other chemicals – including phosphate, parabens, biocides and persistent organic pollutants – while remaining fire safe. As well as being better for the environment, this makes the foam easier to recycle.

Its factory uses energy entirely from renewable sources, and reduces its own water and energy uses. The cotton is from Better Cotton Initiative sources, which promote better standards in farming, both for workers and the environment – but the BCI does have its critics. The pillow is also completely vegan.


You can wash the cover but not the fill – the nanocubes, with their little air cells, would probably never recover from the shock. Because the quilting on the cover is comfortable and the cover itself is so easy to wash (in a machine up to 40 degrees C) we didn’t find we needed a pillow protector.

After almost a year of relentless side-sleeping and occasionally working-from-bed, we did find that some of the nanocubes in our test pillow lost their bounce. This was easy to fix by opening up the fill compartment and moving them around a little: it’s worth doing this every couple of weeks, or whenever you notice the pillow has lost its height.


At almost £100, this is one of the pricier synthetic pillows on the market. But it doesn’t go near the dizzying cost of some high-end down pillows, which can easily cost upwards of £200. Given that the pillow gives you the benefits of a down pillow – loft and comfort – and the practicalities of a foam pillow, we think it’s reasonably priced.

It’s also endlessly adaptable: if you buy it when you’re pregnant and sleeping on your back, for example, you can adjust the fill later to suit it to side sleeping. If you’re injured and want a supportive pillow to aid recovery, you can buy it for that, then refill it with nanocubes when you’re back to back sleeping.

The verdict: Simba hybrid pillow

Of all the pillows our reviewer has tested – from the £300 down fills to the very best memory foam – this is the pillow she sleeps on every night. It’s a brilliant pillow for active people who are prone to the odd neck or shoulder strain, or anyone with a pre-existing injury, because it absolutely won’t exacerbate any damage.

It’s also supremely huggable – if you sleep on the climate-controlled side, you can snuggle your lower arm under its cotton base. A space-age pillow that lives up to its sci-fi promise.

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For a better nights sleep, read our review of the best mattresses, from memory foam to pocket sprung

IndyBest product reviews are unbiased, independent advice you can trust. On some occasions, we earn revenue if you click the links and buy the products, but we never allow this to bias our coverage. The reviews are compiled through a mix of expert opinion and real-world testing.

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