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I have a lot of thoughts about mattresses. After being ‘sold’ a mattress-in-a-box by an influencer waxing lyrical about it on Instagram – and subsequently spending a year moaning about back pain, its lack of firmness and the fact that ‘everything on Instagram is a LIE’ – I vowed never to trust a mattress that comes in a box again.
Until I heard about Simba’s latest iteration: the Hybrid Ultra HeatRelease Mattress.
I’m not new to Simba mattresses. In fact, before purchasing my last completely useless mattress after being served countless paid-for ads for it on Instagram, I actually had a Simba mattress that I liked very much, thank you. The only reason I ever changed it was because I got a bigger bed frame.
So, when I was given the opportunity to test the new Simba Hybrid Ultra HeatRelease, I felt fairly certain I’d like its medium-to-firm squishiness – and hoped my back might finally begin to recover from the web of tangled knots that had accumulated over the previous year.
Hybrid Ultra HeatRelease
The Simba Hybrid Ultra Mattress is the brand’s most premium hybrid mattress, designed to deliver luxury comfort alongside advanced cooling technology.
Featuring 11 layers, up to 7,300 springs, breathable FusionCool™ cushioning and HeatRelease™ technology, it helps regulate temperature throughout the night while providing targeted support and minimising partner disturbance.
At 34cm deep with a plush feel, it also includes a removable washable cover, a 200-night trial and a 10-year guarantee.
Another reason I was fairly desperate to try Simba’s latest model is its new addition of HeatRelease technology – designed to help sleepers remain up to 4.4 degrees cooler than without it. Given the unbearable heatwaves we’ve had this summer, the timing couldn’t have been much better.
The technology sounds complicated, but the premise is fairly simple: graphite-infused HeatRelease strips are designed to draw excess body heat away from you as you sleep. They work alongside Simba’s graphite-infused Simbatex foam and breathable spring construction to transfer heat and encourage airflow through the mattress. According to Simba, the technology begins drawing excess heat away from the body within 20 minutes and continues working throughout the night, helping to maintain a comfortable temperature for up to eight hours.
The Hybrid Ultra HeatRelease Mattress is the deepest mattress in Simba’s range at 34cm – something that was instantly noticeable as I unrolled it onto my bed. It’s a substantial difference that makes you feel like you might need a princess step ladder to get into bed every evening.
One practical point worth mentioning: if you already have a particularly high bed frame, measure before you buy. Add a 34cm mattress, pillows and bedding and you may find your bed sits considerably higher than you’re used to. You’ll also want to check that your existing fitted sheets are deep enough (mine were not).
That depth isn’t purely aesthetic, though. The mattress packs 11 layers and up to 7,300 springs into its plush design, including two layers of cushioning Simbatex foam, a PureLift comfort layer and steel SupportCore springs designed to offer extra support around the hips and shoulders. As a side sleeper, the latter is particularly important to me: I want enough cushioning that my hips and shoulders don’t feel as though they’re pressing into a hard surface, without sinking so far into the mattress that my spine feels unsupported.
On the first night, I was instantly relieved. The mattress felt firm and supportive, but with enough give that I felt softly cradled rather than as though I was sinking into a hot, uncomfortable mound of foam. After a month of sleeping on it, that’s probably still what I like most about it: it manages to feel substantial and supportive without feeling hard.
And then there’s the cooling element. It was around 30 degrees in my bedroom on the first night I tested it, so the mattress was thrown straight in at the deep end. While I won’t pretend I didn’t feel the heat at all – it was still a 30 degree bedroom, after all – I was absolutely more comfortable than I had been on any of the previous hot-weather nights this summer.
Alongside the HeatRelease strips, the mattress has a Stratos ‘cool-touch’ cover, a breathable FusionCool comfort layer and two layers of graphite-infused Simbatex foam, all designed to help prevent heat from building up as you sleep. For me, the difference was noticeable. Rather than feeling actively cold, the mattress simply didn’t seem to hold onto my body heat in the way my previous foam mattress had. Over the course of the past month – which happened to coincide with some of the hottest nights of the year – I found myself waking up far less bothered by the heat beneath me.
There are some other clever details, too. The high number of Aerocoil springs is designed to reduce the impact of a partner moving around during the night, while the top cover zips off and can be machine washed – a small detail but a welcome one when you’re investing this much in a mattress.
Because at £2,599 for a king-size mattress, it’s certainly not a budget option by any stretch of the imagination. But it does come with a 200-night trial and 10-year guarantee, giving you plenty of time to work out whether it’s right for you.
And as someone who has bought and instantly regretted another mattress – only to bemoan it every single night (and whimper in pain on the daily) – I’ve learnt my lesson. Something you spend roughly a third of your life lying on is, in my opinion, worth investing in. After a month on the Simba Hybrid Ultra HeatRelease, my back is happier, I’ve been considerably more comfortable through the heat and, perhaps most importantly, I no longer dread getting into bed at night.
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