Our Simba Hybrid video review
Only have a minute? Check out our video review of the Simba Hybrid. 👇
How we test products
Our mission is to take the guesswork out of finding the perfect sleep products.
We've dedicated hundreds of hours to testing mattresses and sleep accessories, and rely on a team of testers of differing weights, temperature preferences, and sleeping positions to evaluate each product.
Tested products are granted the Sleep Hero tested stamp of approval, a mark of our review's reliability.
If we haven't personally tested a product, please be assured that we invest significant time and energy into scouring the UK market and researching the best recommendations, and we work with a team of sleep experts who review our articles, ensuring that the insights we provide are not only relatable but also reliable.
Simba mattress composition
The Simba mattress is a hybrid pocket-sprung foam mattress that combines high-quality pocket springs with multiple layers of foam.
The layers of the Simba Hybrid (excluding covers) are:
- Open-cell, graphite-infused Simbatex foam
- 2000 Aerocoil conical pocket springs across 13 zones
- CertiPur stability layer
- No roll-off SupportCore base with up to 1000 barrel springs
Simba advertises the Hybrid as a 5-layer mattress, which includes the mattress's breathable top cover.
We look at the mattress cover in more detail further down. 👇
For now, let's look at the actual mattress layers in a bit more detail.
Simba Hybrid mattress layers
We'll look at the cover in more detail further down.
For now, here are the actual mattress foam and spring layers/
1. Top comfort layer of graphite-infused Simbatex open-cell polyfoam
The top layer of the mattress is made from a soft, open-cell polyfoam called Simbatex.
This layer, with its open-cell structure, is much more breathable than closed-cell memory foam and allows for greater airflow. 💨
It also includes graphite, which further enhances the foam's cooling properties.
2. A layer of Aerocoil pocket springs
Up to 2000 mini pocket springs (2.5 cm in height) are positioned right under the comfort layer, providing bounce, high body adaptability, and even pressure distribution.
Mini pocket springs tend to offer better body adaptability than full-size springs do.
These springs are conical, allowing them to compress a fair bit. 🌀
The individual coils are enclosed in polyester fabric pockets, which increases motion isolation and protects the surrounding foams.
The pocket springs are hidden within the mattress so that you won't feel any discomfort.
3. A stability layer
A CertiPur foam layer acts as a transitional and extra stability layer between the Aerocoil spring layer and the SupportCore base layer.
In a previous version, this was made from high-density Simba-Pure foam with Edge Lift Technology and, before that, this layer combined memory foam with latex foam.
This is why Simba used to be called a pocket sprung memory foam mattress.
Since memory foam retains more heat than other types of foam, Simba changed the composition of their mattress to be more breathable overall.
4. SupportCore base layer
The base layer of the Simba Hybrid is made of up to 1000 durable barrel springs.
These provide firm edge support, meaning you can enjoy the full width of the mattress at all times.
The additional springs also allow for better airflow, again enhancing the overall breathability of the mattress.
Simba mattress firmness
The Simba Hybrid has been designed as a mattress with medium firmness - and we'd agree. 👌
We've placed it at 6 out of 10 on the Sleep Hero firmness scale, where 1 is the softest and 10 is the firmest.
Some of our test sleepers perceived the mattress as slightly firmer, but this will depend on your body size and weight. ⚖️
We'll go into more detail on this further down.
Measuring sinkage depths
To do an in-depth Simba mattress review, we've measured how deeply we sank into the foams in different sleeping positions.
This allows us to gauge how the mattress responds to body weight and how much support it gives.
When doing our measurements, we always make sure to take readings at the same place:
- For example, if sleeping on the stomach, we measure at the stomach.
- If sleeping on the back and sides, we measure at the shoulders and hips.
This ensures fair and accurate readings.
The values below are based on the body measurements of one of our test sleepers - 182 cm (5 feet and 9 inches) and 72 kg (158 lbs).
|Position||Depth of sinkage|
|Lying on the back||6 cm (2.3")|
|Lying on the side||7 cm (2.7")|
|Sitting on the edge||9 cm (3.5")|
|Standing in the middle||16 cm (6.2")|
We had multiple other test sleepers who gave similar reports.
As you can see, there is a good amount of sinkage. 👍
This means that the mattress is definitely soft enough to accommodate lighter weight sleepers and adjust to different sleep positions.
In the side position, for example, there is more sinkage than in the back position.
This will ensure that the hips and shoulders sink in a little deeper than the rest of the body, providing optimal spinal alignment.
But, the mattress still allows for even weight distribution.
When standing on the mattress, a lot of weight is placed in one position and the foams sink in very deeply.
You can see this quite clearly in the image below. 👇
Of course, you're unlikely to ever stand on your mattress, but measuring this helps assess the bed.
When lying on the back, though, the weight is distributed over a larger area.
In turn, the foams only sink in a little to allow for a more comfortable sleep.
If the foams would sink in as deeply when lying on the back as they would when standing or kneeling on the mattress, the mattress would be too soft and would likely cause severe back pain.
Measuring the sinkage depths of the Simba has proven that this is a medium-firm mattress that allows for optimal spinal alignment no matter your sleeping position or body weight.
Firmness-wise, this mattress would be suitable for a wide variety of sleepers.
Excellent temperature regulation
The Simba mattress was designed with cooling in mind. 🆒
It has these cooling properties:
- A knitted cover that enhances breathability.
- Open-celled Simbatex foam with cooling graphite.
- Pocket springs with natural ventilation channels, which increases airflow.
These features allow for improved breathability and enable air to flow freely through the mattress. 💨
This keeps you cool and comfortable all night long.
You won't feel hot and clammy on the Simba Hybrid, even on a hot summer's night. 🍉
Our temperature tests
To better demonstrate the temperature regulation of the mattress for our Simba Hybrid review, we took some measurements.
Here, you'll see the results.
The image demonstrates that heat is stored exactly where the test sleeper lies.
But the rest of the mattress remains completely temperature neutral. 👍
As soon as our test sleeper moved to a different position, the previously heated area cooled down.
This proves that the mattress doesn't store excessive heat - and that you can remain cool and comfortable all night long.
Simba mattress cover
The Simba mattress cover has been designed to be hypoallergenic and allow for greater airflow.
It is made of 100% polyester and includes grey sides and a white hand-knitted top cover. 🧶
We really liked how soft and cuddly the cover was!
The Simba cover also has four side carrying handles, which makes moving and transporting the mattress easier.
Only the single-size and small double mattresses don't have the handles.
Removable and washable top cover
You can remove and wash the top cover of the Simba Hybrid mattress cover at 40℃.
Tumble-drying is not recommended.
We love mattresses with removable and machine-washable covers as this is great for hygienic purposes. 🧼
The grey base fabric of the cover can be cleaned with a soft, damp cloth. 🧽
But to further safeguard your mattress, we highly recommend using a waterproof mattress protector.
Mattress protectors create an additional layer between your bedding and your mattress to protect against stains, spills, moisture, dirt, and bacteria.
The Simba mattress protector is great.
Check out the Simba mattress protector below:
Simba mattress prices
The Simba Hybrid mattress is more expensive than comparable bed-in-a-box mattresses, but it is on par with other luxury mattresses.
You can also look out for some Simba mattress deals to get a discounted price - more on this below. 👇
(Note: prices listed below are standard prices excluding any current coupons & discounts)
Simba mattress UK delivery
The Simba Hybrid is a bed-in-a-box mattress. 📦
It is delivered rolled up, vacuum packed, and tightly sealed in a compact box that measures 107 x 50 x 50 cm (42" x 19" x 19").
Delivery is free within mainland UK and usually takes place within 1 - 3 working days.
Simba offers a next-day delivery service at an additional cost.
They also deliver to the Highlands, Northern Ireland, islands and other remote areas, but a delivery fee will apply here.
Your mattress will be delivered directly to your doorstep. 🚛
You can store your Simba mattress in its box for up to three months.
Your 200-day trial starts with delivery, regardless of whether you unpack the mattress or not.
Can Simba remove my old mattress?
Simba offers a removal service, where they collect your old mattress when they deliver the new one.
Simply select the mattress removal option at checkout. 👩💻
How do I unpack my Simba mattress?
Your new mattress is super easy to unpack:
- Open the box and take out your mattress.
- Unroll the flattened mattress on your bed base.
- Cut the plastic and break the vacuum seal.
- Remove any other packaging.
Your mattress will begin inflating as soon as you've removed the vacuum seal. 🥳
Your mattress will have reached its full size within 3 - 6 hours, but sometimes it can take up to 72 hours for the mattress to expand completely.
Our Simba mattress took several hours to expand fully. ⏰
You can sleep on your mattress as soon as it's expanded.
Does the Simba mattress smell?
Our mattress didn't smell when we unpacked it, but you may notice a slight smell when you first unpack it.
This is called off-gassing, and it's totally normal with bed-in-a-box mattresses.
We'd recommend unpacking your mattress in a well-ventilated room and letting it air out until the smell dissipates. 🏡
Which bed base can I use for my Simba mattress?
The Simba mattress can be placed on top of any bed base, including adjustable bases, slatted frames, divan bases, or box springs.
If you're using a slatted bed frame, ensure that the slats are no greater than 7.5 cm (3 inches) apart so that your mattress is supported correctly.
Should you buy the Simba Hybrid mattress?
The Simba Hybrid mattress is a high-quality, supportive, and comfortable mattress that offers the perfect night's sleep.
We thought it was one of the best mattresses we've ever slept on and would buy it again in a heartbeat. 💙
We would recommend the Simba mattress for:
- Light- and average-weight sleepers.
- People who sleep on their side or back.
- People who like a medium-firm feel.
- Heavy sweaters.
- Restless sleepers.
Heavier-weight people, those of larger builds, or stomach sleepers are advised to make use of the risk-free trial period to see if the mattress can support them well enough.