Who is the Simba Hybrid Pro suitable for?
We tested the Simba Hybrid Pro for this in-depth mattress review, and can confidently say the mattress is most suitable for:
- All sleepers, but particularly side sleepers
- People who enjoy good body-contouring
- Lighter-weight and average-weight people
- People who like a softer to medium-firm feel
- Restless sleepers and couples
- Those after a plushier and more luxurious feel
We'll go into all the details below, but take a look at our ratings first for a quick overview:
What does sleeping on the Simba Hybrid Pro mattress feel like?
The Simba Hybrid Pro is a super comfortable mattress, and we've tested all aspects of what it feels like to sleep on for you.
How comfortable is the Simba Hybrid Pro mattress?
The Simba Pro Hybrid is a great mattress that’s very comfortable and very supportive.
- The top layers give it softness and give you something to sink into, giving you that gentle squishy feeling, which is great if you’re a side sleeper.
- But you’ll also feel a strong level of firmness once you hit the supportive layers underneath, which is great for front and back support. Front and back sleepers generally need a firmer mattress with good pressure distribution to carry the weight of the body without too much sinkage.
We really liked the hybrid nature of this mattress.
Since it contains up to 4,800 mini pocket springs, it's quite a bit bouncier, offers great support and pressure relief, adapts to your body really well, and is easy to move around on.
It’s also rare to find a bed-in-a-box mattress that can give heavier-weight people enough firmness and support, but the Simba Hybrid Pro, despite its medium-firm rating, does this really well.
Heavier-weight sleepers may find the wool layer a bit too soft and squishy, but they won’t be lacking in support.
How firm is the Simba Hybrid Pro mattress?
The Simba Pro mattress is rated as medium-firm, and we've judged it a 6.5 out of 10 on the Sleep Hero firmness scale, where 1 is the softest and 10 is the firmest.
This is due to the dual spring system and additional wool layer.
But while the top is body-contouring and comforting, you’ll quickly feel the firmer support layers underneath, together with exceptional edge support.
The wool layer also breaks some sinkage, so you can move around on the mattress quite comfortably and won’t feel like you’re sinking into the foams too much or risk sliding off the edges.
How we tested the Simba Hybrid Pro's firmness levels
In order to give you a proper Simba Hybrid Pro mattress review, we relied on a bit of maths and measured how deeply we sank into the foams. 🧮
Measuring sinkage is a good way to determine how supportive a mattress would be for different sleepers.
To test this, we used two different sleepers and measured their sinkage depths in various positions, with the following results:
| Person A (1.78 m / 65 kg) | Person B (1.80 m / 78 kg) | |
| Lying on the back |
Shoulder: 5.5 cm Pelvis: 6 cm |
Shoulder: 6.5 cm Pelvis: 7.5 cm |
| Lying on the side |
Shoulder: 7.5 cm Pelvis: 7 cm |
Shoulder: 8 cm Pelvis: 7.5 cm |
As you can see, sinkage depths for the side position are quite a bit deeper than in the back position. This is important.
It’s relatively easy for your spine to remain in its optimal alignment if you’re sleeping on your front or back (provided the mattress is firm enough to support you).
But side sleepers need the mattress to play along a bit more.
Weight is concentrated at two peak points, the shoulders and the hips.
These two parts of the body need to be able to sink in much deeper than the lighter parts of the body so that the spine remains in its optimal alignment.
The Simba Hybrid Pro does this exceptionally well.
Overall, we found the Simba Hybrid Pro to offer decent soft to medium-firm support, making it especially well-suited to side sleepers and combination sleepers.
Does the Simba Hybrid Pro mattress sleep hot?
Simba has spent a significant amount of time developing a mattress with superior airflow and heat management, and the Simba Hybrid Pro features numerous temperature-regulation features:
- Soft and breathable cover for enhanced airflow
- Naturally thermoregulating wool layer
- Graphite particles in the open-cell foam
- Springs with natural ventilation channels
- Grooves in the base foam for greater airflow
- The upgraded version contains HeatRelease for active cooling
Overall, the Simba Hybrid Pro is known for its exceptional temperature regulation.
How we tested temperature regulation
We found that the Simba Hybrid Pro offered more of a medium-warm feel.
Take a look at our temperature image, which demonstrates where heat is stored.
Even though wool is thermoregulating, it can feel a little warmer and more cosy.
The Simba Hybrid Pro may be cooler than memory foam mattresses (which tend to retain more heat), but we still wouldn’t recommend it to very heavy sweaters or people who easily feel hot at night.
UPDATE: You may, however, find the new HeatRelease version more fitting.
You won’t feel too clammy on the Simba Hybrid Pro mattress as the wool layer wicks away moisture quite effectively, but if you’re after a cooler sleep, we’d recommend checking out our top cooling mattresses instead or opting for the Simba Hybrid Pro with active HeatRelease advanced cooling.
Is the Simba Hybrid Pro mattress good for couples?
We think the Simba Hybrid Pro is an excellent choice for couples.
It's not only easy to move around on and offers exceptional edge support, but it also isolates movement pretty well. 🏃♀️
- While springs generally transfer a bit of movement, pocket springs can move independently of each other.
- At the same time, the wool top layer and top comfort layers absorb movements really well.
This all results in overall low motion transfer, meaning that movements are absorbed at the point of impact and won’t be carried through the mattress.
It also means that your partner tossing and turning at the other end of the bed won’t wake you up! 💃
How we tested motion isolation
In order to give you the most accurate information, we've made a point of testing motion isolation for our Simba Hybrid Pro mattress review.
Take a look at the two images below:
These images illustrate the transfer of motion:
- Left image: Motion transfer when getting in and out of bed
- Right image: Motion transfer when turning around on the mattress
As you can see, there is some transfer of motion when you climb into bed or get up again, but there is much less transfer of motion when you turn around on the mattress.
This confirms that the Simba Hybrid Pro has low overall motion transfer.
We will say that your experience of motion isolation with the Simba Pro does depend a bit on the bed frame as well.
If paired with a slatted frame, for example, and especially a cheaper frame, you'll experience a greater transfer of motion than with a divan base.
Simba Hybrid Pro vs Simba Hybrid Pro with HeatRelease
Simba has recently launched HeatRelease, a graphite-strip cooling upgrade available on the Hybrid Pro for those who want extra temperature control on top of the mattress's existing wool and graphite-infused foam.
Here's how the standard Hybrid Pro compares to the HeatRelease version:
| Simba Hybrid Pro | Simba Hybrid Pro + HeatRelease | |
| Cooling tech | Graphite-infused Simbatex foam, natural wool layer, ventilated Aerocoil springs | All of the standards, plus a dedicated HeatRelease graphite strip layer |
| How it cools | Passive: Breathable materials and airflow channels | Active: Graphite strips draw excess body heat away from the sleeper within around 20 minutes |
| Manufacturer's cooling claim | Not separately tested/rated by Simba | Up to 4.4°C cooler, maintained for up to 8 hours* |
| Best for | Sleepers happy with medium-warm temperature regulation | Hot sleepers, or anyone in a bedroom that struggles to stay cool overnight |
| Price | Standard pricing | +£249 upgrade at checkout |
| Everything else | Same 8-layer construction, medium-firm feel, 200-night trial, 10-year guarantee | Identical. HeatReleasedoesn't change the comfort or support layers |
In short: If you already sleep at a comfortable temperature on the standard Hybrid Pro, the upgrade probably isn't essential.
But if you're the kind of sleeper who wakes up too warm, or you're buying for a particularly hot bedroom, HeatRelease is a fairly low-cost way to add active cooling without switching mattresses entirely.
*Under testing in an ISO accredited lab, the upper foam layer of a HeatRelease mattress was found to be 4.4°C degrees lower
Simba Hybrid Pro mattress review composition
The Simba Hybrid Pro is a 28 cm upgraded version of the original Simba Hybrid mattress.
It features eight layers of premium materials to create one of the most luxurious - but still competitively priced - mattresses in the UK market.
Layer 1: Simba Hybrid Pro mattress cover
The Simba Hybrid Pro features a breathable sleep surface with cool-touch Stratos technology, and the 750g hypoallergenic knitted cover of the Pro is softer and more luxurious than the 500g knitted cover of the original mattress.
This is not a lightweight mattress and it does need to be rotated head-to-toe every few months, so the larger-sized options all have four convenient side handles to make this easier.
The Simba Hybrid Pro mattress cover is removable and machine-washable, making hygiene a breeze.
But, we'd still always recommend using a waterproof mattress protector to safeguard your mattress against dirt, spills, stains, and bacteria.
You'll find three excellent Simba mattress protectors - opt for the waterproof ones for the best effect!
Layer 2: Natural wool
The top layer of natural British wool [1] is unique to the Simba Hybrid Pro, added in to help with heat regulation. 🐑
Wool has moisture-wicking properties and is naturally thermoregulating, keeping you cooler in summer and warmer in winter.
It's also naturally resistant to bacteria, making it a great hypoallergenic [2] material to use in mattresses and bedding.
Layer 3: Comfort layer of open-cell graphite-infused Simbatex foam
The company-branded Simbatex foam makes up the comfort layer of the Simba Hybrid Pro mattress.
This open-cell foam layer features larger pores and has been developed to be much more breathable than memory foam, providing greater airflow.
The Simbatex comfort layer also features graphite particles for additional cooling properties.
Layers 4 + 5: Two layers of conical mini pocket springs
The Simba Hybrid Pro features a dual layer of up to 4,800 titanium alloy Aerocoil mini pocket springs (2.5 cm in height), manufactured in Leeds.
These pocket springs provide bounce, high body adaptability, and even pressure distribution.
The Simba Hybrid Pro pocket springs are conical, which allows them to be easily compressed and results in superior body adaptation.
The spaces between the springs also create natural ventilation channels, further enhancing airflow and preventing overheating.
They're enclosed in 100% polyester pockets, which increases motion isolation and protects the surrounding foams.
It's worth noting that the fabric pockets compress the springs slightly, making this layer a bit thinner than you’d expect when looking at the height of the springs.
Layer 6: CertiPUR foam stability layer
The layer of CertiPUR foam delivers both structure and support, acting as a bridge between the Aerocoil spring layers and the SupportCore base.
Layer 7: No roll-off SupportCore
The core of the Simba Hybrid Pro is made up of 1,000 tempered steel barrel springs.
They collaboratively offer robust support across the entire mattress, enabling sleep right up to the edges without any sagging.
They're also encased in fabric to allow independent response to pressure.
By using springs at the core, this mattress contains 68% less foam than previous versions, a great feat for the more eco-conscious! If you're going green, though, it may be worth checking out Simba's organic mattresses, which are much better for the environment. 🌍
Layer 8: Simba ReGen base
The Simba ReGen layer is the new mattress base layer.
It's crafted from surplus foam and repurposed into a premium product that adheres to stringent density standards. 🛏️
The foam utilised meets the CertiPUR standard [3], ensuring it's devoid of environmental pollutants and harmful substances.
The Hybrid Pro is currently Simba's best-selling mattress, close second to the original.
Check out all of Simba's bestsellers:
Simba Hybrid Pro mattress sizes
The Simba Pro Hybrid mattress is available in all standard UK mattress sizes, as well as select European mattress sizes.
- Simba Hybrid Pro mattress single: 90 x 190 cm (3’ x 6’3”)
- Simba Hybrid Pro mattress small double: 120 x 190 cm (4’ x 6.3”)
- Simba Hybrid Pro double mattress: 135 x 190 cm (4.4” x 6’3”)
- Simba Hybrid Pro mattress king-size: 150 x 200 cm (5’ x 6’6”)
- Simba Hybrid Pro super king mattress: 180 x 200 cm (6’ x 6’6”)
- Simba Hybrid Pro mattress European double size: 140 x 200 cm (4’6” x 6’6”)
- Simba Hybrid Pro mattress European queen size: 160 x 200 cm (5’2” x 6’6”)
It has a height of 28 cm (11 inches).
This is 3 cm deeper than the industry standard, but your usually bedding and mattress accessories still fit comfortably.
We love Simba's new bedding range, which offers everything from soft muslin to luxurious Egyptian cotton, designed to fit even deeper mattresses.
What does the Simba Hybrid Pro cost?
The Simba Hybrid Pro is one of the pricier bed-in-a-box mattresses on the market in the UK but it's also an excellent option and well worth the investment.
Where can you find Simba Hybrid Pro discount codes?
Even though this mattress is more expensive than other premium online mattresses, Simba Sleep UK sometimes offers Simba Hybrid Pro deals.
Coupon codes are easy to use and can help you secure the best price.
You may also get free sleep accessories, like the Simba Hybrid Pillow or Simba Hybrid Duvet, with your purchase.
If currently running, Simba Hybrid Pro discount codes and special offers will be displayed throughout this article.
Is there a Simba mattress NHS discount?
Simba Sleep offers a special discount to NHS staff and Blue Light Card members.
You’ll need to provide some form of identification to access the discounts, but the Simba Sleep customer support team can assist you with this.
All you need to do is contact them via the online chat function on the Simba Sleep website.
Get the best price on the Simba Sleep website:
Simba Hybrid Pro mattress delivery and trial conditions
The Simba Hybrid Pro is delivered rolled up and vacuum-sealed in a compact box.
Delivery is free within mainland UK and you can get free next-day delivery.
You can also ask Simba Sleep to remove your old mattress when they deliver the new one - simply select the mattress removal service option at checkout.
It’s worth mentioning that the Simba Pro Hybrid mattress can be quite heavy, depending on the size ordered, and you may need to ask a friend or family member to help you carry it.
The team delivering our Simba Hybrid Pro was super helpful, carrying the heavy box upstairs without hesitation or complaint.
How to unbox your Simba Hybrid Pro mattress
If you’re new to bed-in-a-box mattresses, you may be wondering how you’ll get a full-size mattress out of the tiny box it’s delivered in.
Luckily, unboxing online mattresses is super easy:
- Open the box and take out your mattress (best to do this on your bed frame).
- Unroll the mattress on your bed support base.
- Carefully cut the plastic to break the vacuum seal.
- Wait for your mattress to expand.
The Simba mattress should reach its full size within 3 - 6 hours, but it may take up to 72 hours to expand completely. ⏰
What is off-gassing?
You may notice an odd chemical smell coming from your mattress when you first unpack it.
This is called off-gassing, and it’s completely normal.
The fumes are merely a result of the production process, and they’re not toxic or harmful in any way.
We experienced very minimal off-gassing, which dissipated within a few hours.
Does the Simba Hybrid Pro mattress come with a trial period?
Every Simba mattress UK comes with a risk-free 200-night trial period.
This begins as soon as the mattress has been delivered.
The industry standard is 100 nights, so Simba Sleep gives you a significantly longer time to test the mattress.
Trial periods are very important, and we firmly believe that it’s impossible to tell if a mattress is right for you by just lying on it for a few minutes in a shop - or even for just one night.
It can take your body up to three weeks to get used to a new mattress, especially if it's vastly different to what you’re used to.
A trial period gives you the chance to try out the mattress in the comfort of your own home for an extended period of time.
How to return a Simba Hybrid Pro mattress
If you’ve tried the Simba mattress and don’t think it’s right for you, you can return it for a full refund.
To do this, simply contact Simba customer services, and they’ll organise the whole process for you.
Returns are free of charge, and you don’t even have to keep the original packaging.
Once returned, you’ll receive a full refund within a few days.
What happens to returned Simba mattress?
Don’t worry - returned mattresses don’t go to waste.
All returned Simba mattresses are refurbished for re-sale, recycled, or donated to charities. ♻️
You can find Simba refurbished mattresses on their site for a reduced price.
All Simba mattresses, including the Simba Hybrid Pro, come with a 10-year warranty.
While you're getting your new Simba, why not add some of their great accessories, too?
Should you buy the Simba Hybrid Pro?
The Simba Hybrid Pro is one of the best mattresses on the market and will certainly offer you a good night’s sleep.
We would recommend the Simba Hybrid Pro to:
- All sleepers, but particularly side sleepers
- People who enjoy good body-contouring
- Lighter-weight or average-weight sleepers
- People who like a medium-firm feel
- Restless sleepers and couples
- Those after a plushier and more luxurious feel
The Simba Hybrid Pro is also Simba Sleep's best-selling mattress, so you know you're in for a treat.
If you're on a bit more of a budget though, the Simba Hybrid is still an excellent option. 💤
Contact Simba Sleep UK
Customer service: To contact Simba Sleep directly for complaints, support, or queries, please e-mail them at hello@simbasleep.com or visit their live online chat. The customer services team is available Monday to Friday, from 9 am - 5 pm, and Saturdays from 9 am to 1 pm.
Registered office: Simba Sleep Limited, 5th Floor Halo Counterslip, Bristol, BS1 6AJ
Table of Contents
Who is the Simba Hybrid Pro suitable for?
What does sleeping on the Simba Hybrid Pro mattress feel like?
Simba Hybrid Pro vs Simba Hybrid Pro with HeatRelease
Simba Hybrid Pro mattress review composition
Simba Hybrid Pro mattress sizes
What does the Simba Hybrid Pro cost?
Simba Hybrid Pro mattress delivery and trial conditions












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