Simba Natural Hybrid Apex Super King Mattress
The Simba Natural Hybrid Apex is a hybrid mattress, which means it pairs springs with comfort layers rather than relying on foam alone.
- Natural silk, cashgora & wool fillings
- Zoned support for your spine
- Mini springs reduce motion transfer
£1,808
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Simba Natural Hybrid Apex Mattress
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Mattress details
Mattress
Simba Natural Hybrid Apex Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Hybrid
Wool
Natural
Depth (cm)
32
Layers
3
Layer Details
Natural comfort layer
Several comfort layers of silk, cashgora and wool sit at the top. These natural fibres give the surface its cushioning, and the wool and silk fillings are what you'll feel first when you lie down.
Aerocoil springs
5700 conically shaped Aerocoil mini springs are spread across multiple layers. Because they are mini pocket springs, they reduce motion transfer, so you should notice less of your partner's movement.
CoreMax sprung base
Simba's exclusive CoreMax spring unit is zoned in seven areas and uses 1000 steel springs inside a reinforced steel frame. The zoning gives different parts of your body different levels of support, and the frame helps the base keep its structure.
Layer details from simbasleep.com and mattressonline.co.uk product pages, October 2026.
Key benefits
- 90cm each, every night: Two people sharing get 90cm apiece, which means a partner who turns over frequently is simply further away and much easier to sleep through.
- 30cm wider than a UK king: The UK super king adds 30cm of width over the UK king at the same length, and that extra strip is where a child or pet ends up.
- Depth that suits a big bed: At 32cm deep, listed by Simba, the Apex has real presence at this footprint, so a super king frame won't dwarf the mattress sitting on it.
- Medium firm across a wide surface: The medium firm hybrid feel holds up well when weight is spread unevenly, which matters when three bodies of very different sizes share one mattress.
- Fills a large master properly: In a period property or generous new build master, a UK king can look undersized against the wall; 6ft of width sits in proportion.
This size suits you if...
You share the bed every night and want the most space UK retailers stock as standard, your children or dogs regularly join you and everyone still needs their own patch, or you have a large master bedroom where a UK king would look lost. Allow at least 3m x 2.9m of floor space, ideally more.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest as a minimum, or you sleep alone. The UK king keeps the same 200cm length with a footprint that suits smaller rooms, so we'd recommend that instead.
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FAQ's
Is the Simba Natural Hybrid Apex super king big enough for a family sharing?
It's the most forgiving standard size for it. At 180 x 200cm, two adults get 90cm each, so when a child wanders in at 3am there is a genuine share of the bed left over rather than everyone shuffling to the edges. The medium firm feel also limits how much one person's movement travels across to the others.
How much bigger is the super king Apex than the UK king version?
The UK super king is 30cm wider than the UK king, and the two are the same length at 200cm. In practice that extra width is the difference between tolerating a restless partner and barely noticing them. If your room can take 180cm of mattress width, it's the more comfortable choice for sharing.
What room size do I need for the Simba Natural Hybrid Apex in a super king?
We suggest at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable, so you can open drawers and walk round both sides without sidling. In a loft conversion, check the sloping ceiling too: a 6ft wide bed limits which wall it can sit against. These are our recommendations, not Simba's.
Will the super king Apex be hard to get into the bedroom?
It's the heaviest and bulkiest size of this mattress, and at 32cm deep it's a substantial thing to manoeuvre, so tight landing turns and narrow door swings deserve a measure before you order. Simba doesn't publish a weight for this size, so plan for two people to move it regardless.
What bedding fits the Simba Natural Hybrid Apex in a super king?
You'll need super king sheets and, for two sharing, a 260 x 220cm duvet works well. Because the Apex is 32cm deep, choose fitted sheets labelled deep or extra deep; a standard pocket can ping off overnight. Bedding at this size costs more than king equivalents, so factor that into the switch.