Simba Natural Hybrid Source Mattress
The Simba Natural Hybrid Source is a medium firm hybrid mattress, made and finished in Hampshire, that combines springs with what Simba describes as nature's best materials.
- Made & finished in Hampshire
- Built around natural materials
- Medium-firm sprung support
£674.25
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The Simba Natural Hybrid Source measures 28cm deep across every size, from UK Single up to UK Super King. Simba's own page is light on construction detail, so we can't tell you exactly what sits inside each layer. What we can say is that a medium firm hybrid at this depth suits most sleepers, although lightweight side sleepers may find it a little too firm for pressure relief at the shoulder and hip.
Mattress specifications
Firmness
Medium Firm
Type
Hybrid
Depth (cm)
28
Number of Layers
4
Trial Period (nights)
Warranty (years)
Price Range
£674 to £1,199
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
Assessed from Simba's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If provenance matters to you, this mattress is made and finished in Hampshire, and Simba positions it around natural materials rather than all-foam construction. It's a hybrid, which means springs provide the core support while comfort layers soften the surface, a combination that tends to sleep cooler than memory foam alone. The 28cm depth is generous and consistent across all four sizes, so a Super King feels no shallower than a Single. It sits at the pricier end, but Mattress Online lists a 10 year guarantee, which offers some reassurance for the outlay. Yes, the published detail is thin, but the fundamentals here are sound.
Key features & layer details
Viscose plant-based cover
The top layer is a viscose cover made from sustainable, plant-based fibres. It's the part you lie on, so it gives the mattress a plant-based surface rather than a synthetic one.
Hampshire wool comfort layers
Two layers of Hampshire wool sit above three further layers of British wool, giving five layers of wool cushioning in all. That adds softness over the springs and a natural-fibre feel, though the firmness is still medium firm.
Aerocoil mini pocket springs
These are precision-made mini springs in British steel, and one source gives the count as 1900. Each spring is pocketed, so the support is shaped to your body, which helps the surface follow your curves.
CoreMax pocket spring base
A glue-free base of British steel pocket springs, arranged in seven zones. The zoning gives different areas of the body different support, and the glue-free build means the base relies on its springs rather than adhesive.
Layer details from simbasleep.com and mattressnextday.co.uk product pages, October 2026.
Best suited for?
Warm sleepers
Springs provide the core support in this hybrid, and that combination tends to sleep cooler than memory foam alone, which helps if you run hot.
Eco-conscious buyers
Simba positions this mattress around natural materials rather than all-foam construction, and it is made and finished in Hampshire, so provenance is easy to trace.
Couples
The 28cm depth is the same in every size up to UK Super King, so a larger bed feels just as substantial as a Single.
Back sleepers
A medium firm feel with springs for core support suits most sleepers, which should keep the body level and supported when lying on the back.
Combination sleepers
Medium firm hybrids at this depth suit most sleepers, giving a balanced surface that should feel comfortable as you move between positions overnight.
If you like to research every layer before buying, the lack of published construction detail may frustrate you. Lightweight side sleepers who need a softer, more contouring surface could find medium firm slightly too solid. And budget-focused buyers will find cheaper hybrids elsewhere.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Simba Natural Hybrid Source Double Mattress
Simba Natural Hybrid Source Mattress
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FAQ's
How firm is the Simba Natural Hybrid Source mattress?
It's listed as medium firm, which suits most back and combination sleepers. Side sleepers with a lighter build may find it a little too firm, as they often need a softer surface to relieve pressure at the shoulder and hip.
What sizes does the Simba Natural Hybrid Source come in?
Four UK sizes are available: Single, Double, King and Super King. Every size is the same 28cm deep, so you get the full mattress height whichever you choose.
Does the Simba Natural Hybrid Source have a guarantee?
Mattress Online lists a 10 year guarantee for this mattress. Simba's own product page doesn't state guarantee terms, so it's sensible to confirm the cover with your chosen retailer before you buy.
Where is the Simba Natural Hybrid Source made?
Simba states the mattress is made and finished in Hampshire, in the UK. The brand describes it as using nature's best materials, although the product page doesn't break down the specific composition of each layer.
Is the Simba Natural Hybrid Source a memory foam mattress?
No, it's a hybrid, which means it pairs springs with comfort layers rather than relying on foam alone. Hybrids generally sleep cooler and feel more responsive than all-foam mattresses, which is helpful if you tend to overheat at night.
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