Simba Hybrid Pro Mattress Review
This is where a Simba becomes a genuine hybrid. The Pro adds a SupportCore base with up to 1,000 tempered steel barrel springs, which is a real spring core.
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Verdict
This is where a Simba becomes a genuine hybrid. The Pro adds a second Aerocoil layer and, far more importantly, a SupportCore base with up to 1,000 tempered steel barrel springs. That is a real spring core, and it is the best mattress Simba makes for the money.
Buy it if
You like the Simba feel, you want a proper spring base under it, and you are glad of being able to try one in a shop first.
Avoid it if
You are buying purely on value. Origin gives you more depth and more spring for under half the price.
See the current Simba offer
Community heroes get up to 31% off everything, which covers a notably wide eligibility list.
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Simba on Amazon UK
Check the seller. The 200 night trial and the wool layer are worth buying direct for.
No code needed. Prices on Amazon change frequently, so check the seller and the returns terms before you buy. Opening in a new tab.
| Specification | Detail |
|---|---|
| Type | Hybrid with a genuine steel spring support core |
| Depth | 28cm |
| Layers | 8 |
| Aerocoil springs | Up to 3,800, 25mm tall, in two layers |
| SupportCore base | Up to 1,000 tempered steel barrel springs |
| Total spring count | Up to 4,800 |
| Comfort layer | British wool plus Simbatex |
| Cover | 530g knitted with Stratos technology, zip-off washable |
| Optional | HeatRelease graphite strips |
| Firmness | Medium firm |
| Trial | 200 nights |
| Guarantee | 10 years |
| Price from | £899 |
| Reviews | Around 37,000 on Simba's site |
What the Pro adds, and why it matters
The jump from the Simba Hybrid to the Hybrid Pro is the most meaningful upgrade in Simba's range, and it is not the one the marketing emphasises.
The headline is that the Pro doubles the Aerocoil layer, going from up to 1,900 springs in one layer to up to 3,800 across two. That is a comfort improvement and it is real.
The thing that actually matters is underneath. The Pro replaces the standard Hybrid's zoned foam base with a SupportCore base containing up to 1,000 tempered steel barrel springs. Simba's own specification describes it as giving “firm, edge-to-edge support with no roll-off, while reducing foam content”.
That single change converts the mattress from foam-with-a-clever-top into a structurally genuine hybrid. Edge support improves, because barrel springs run to the perimeter. Longevity should improve, because steel does not develop compression set the way foam does. And support under heavier load improves, because you are compressing springs rather than reaching the bottom of a foam base.
The scores
A genuinely well built mattress and the point at which Simba's price makes sense.
Good, not outstanding. Origin's Hybrid Pro gives more depth and spring for under half.
Two Aerocoil layers over a 1,000 barrel spring core. Handles heavier sleepers well.
Simbatex, wool, two spring layers and optional graphite strips. Among the coolest at the price.
The barrel spring base runs edge to edge. No roll-off, which the standard Hybrid cannot claim.
Independently pocketed across three spring layers. Strong for couples.
200 nights and 10 years, with a returns process that works.
The British wool layer, and whether it earns its place
The Pro adds a British wool comfort layer that the standard Hybrid does not have, and this is one of the few material upgrades in the category I think genuinely justifies its cost.
Wool regulates moisture rather than just temperature. It absorbs moisture vapour without feeling damp and releases it as conditions change, which is why wool bedding feels comfortable across a wider range of room temperatures than synthetics. For anyone who sleeps hot in summer and cold in winter, that matters more than any cooling gel.
It is also naturally flame resistant, which reduces the need for chemical fire retardant treatment to meet UK regulations. Nobody markets that, and it is a real benefit.
Why this is the Simba for heavier sleepers
Independent testing by Sleep Hero noted that the Pro handles heavier-weight sleepers well despite a medium firm rating, and the construction explains why.
Twenty-eight centimetres of depth means more to compress before you reach anything solid. Two Aerocoil layers spread load across more contact points. And the barrel spring core pushes back progressively rather than bottoming out the way a foam base does.
Bed-in-a-box mattresses that genuinely work above about 16 stone are rare, and this is one of the few. Above roughly 18 stone I would still look at Otty's Extra Firm, which is built specifically for that load.
Stratos, HeatRelease and the other trademarks
Simba names everything, so here is the translation.
- Stratos. A phase change material in the cover that absorbs heat as it changes state and releases it as it changes back. It moderates surface temperature swings. It is a real technology with a finite capacity, so it smooths temperature rather than cooling indefinitely.
- HeatRelease strips. An optional upgrade of graphite, polypropylene and aluminium strips. Graphite and aluminium both conduct heat away from the surface. Reasonable physics, marginal effect, and I would not pay much extra for it.
- Simbatex. Open structure foam with graphite. Intertek testing in May 2025 found over five times the airflow of memory foam under ISO 7231. This one is genuinely well evidenced and it is the reason Simbas sleep cooler than most foam.
- SupportCore. The barrel spring base described above, and the most important component in the mattress.
A correction worth making
Commonly repeated, and wrong
Reviews routinely present the Simba Hybrid and the Simba Hybrid Pro as the same mattress at two depths, with the Pro simply having more springs. They are structurally different products. The standard Hybrid has a nine-zoned foam support base. The Pro has a SupportCore base with up to 1,000 tempered steel barrel springs. That is the difference between a foam mattress with a sprung comfort layer and a genuine hybrid, and it is worth far more than the extra Aerocoils the marketing leads on.
Should you buy it?
Yes, if you want a Simba. This is the model where the construction justifies the price, and at a 25 to 30 percent discount it sits around 630 to 675 pounds, which is fair for what it is.
The honest caveat is the one that applies to the whole brand. Origin's Hybrid Pro gives you 31 cm and up to 5,700 springs from 374 pounds. On construction alone Simba does not win that comparison. What Simba gives you instead is a shop you can visit, a company with 37,000 reviews on this model alone, and a returns process at a scale a smaller brand cannot match.
Whether that is worth roughly 300 pounds is a real question, and for a lot of people the answer is genuinely yes.
Full range in the Simba review, or see current Simba discounts.
Questions people ask
What is the difference between the Simba Hybrid and the Hybrid Pro?
They are structurally different products, not the same mattress at two depths. The standard Hybrid has a nine-zoned foam support base. The Pro has a SupportCore base with up to 1,000 tempered steel barrel springs, plus a second Aerocoil layer and a British wool comfort layer.
Is the Simba Hybrid Pro good for heavier sleepers?
Yes, and it is one of the few bed-in-a-box mattresses that genuinely works above about 16 stone. Twenty-eight centimetres of depth, two Aerocoil layers spreading load, and a barrel spring core that pushes back progressively rather than bottoming out the way a foam base does.
What is Stratos in a Simba mattress?
A phase change material in the cover that absorbs heat as it changes state and releases it as it changes back. It moderates surface temperature swings rather than cooling indefinitely, because its capacity is finite. Real technology, modest effect.