Simba Natural Hybrid Source King Size 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
£1,049
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Simba Natural Hybrid Source Mattress
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Mattress details
Mattress
Simba Natural Hybrid Source Mattress
Size
Firmness
Medium Firm
Construction
Pocket Spring
Hybrid
Wool
Natural
Depth (cm)
28
Layers
4
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.
Key benefits
- Room to move without waking anyone: With 75cm each for two people sharing, one partner's early alarm or restless night is far less likely to disturb the other.
- Extra length for taller sleepers: At 200cm, the UK king adds 10cm of length over a double, so anyone approaching 6ft stops sleeping with their feet at the edge.
- A hybrid that suits sharing: Springs beneath comfort layers give consistent support across the full 150cm width, which means neither of you rolls towards the middle.
- Full depth at full size: The 28cm depth is the same in the UK king as in every other size, so upgrading costs you nothing in feel.
- Fits a normal master bedroom: We suggest a room of at least 2.7m x 2.9m, which most UK master bedrooms manage even with wardrobes in place.
This size suits you if...
You share the bed every night and a double has started to feel like a negotiation, especially if you keep different hours and one of you slips out early. It also suits couples where one partner is over six foot, since the 200cm length is the real upgrade. And if a dog has quietly claimed a corner of the bed, the extra width absorbs that without argument.
Consider another size if...
Your bedroom is tighter than our suggested 2.7m x 2.9m minimum, or you sleep alone. Solo sleepers would find the UK double more than roomy enough, and for small rooms we'd recommend the UK double instead.
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FAQ's
Is the Simba Natural Hybrid Source UK king big enough for a couple?
Comfortably, for most. At 150 x 200cm you each get 75cm of width, and the medium firm hybrid construction keeps support even across the surface, so one person shifting position is felt less by the other. If you're both broad-shouldered or share with a pet nightly, the UK super king is the roomier option.
Will the UK king Simba Natural Hybrid Source fit my bedroom?
The mattress itself is 150 x 200cm, or 5ft x 6ft 6in. We suggest a room of at least 2.7m x 2.9m so you can walk round both sides and open drawers, with 3.2m x 3.2m feeling comfortable. Measure with wardrobes and bedside tables in place, since new build master bedrooms often shrink once furniture arrives.
Is the UK king long enough for someone over 6ft?
Yes, and length is often the real reason to upgrade. The UK king runs to 200cm, 10cm longer than a double, which stops taller sleepers pushing their feet against the footboard or off the end. The 28cm depth is unchanged from smaller sizes, so you get the full medium firm hybrid feel at the longer length.
Should we upgrade from a double to a king in this mattress?
If you share every night, probably. The UK king is 15cm wider than the UK double, a difference you notice each time one of you turns over or gets up first. The Simba Natural Hybrid Source feels identical in both, so the decision is purely about space and whether your room meets our 2.7m x 2.9m suggestion.
Where can I buy the Simba Natural Hybrid Source in a UK king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so it's worth checking back rather than assuming the first price you saw still stands. Stock in the UK king specifically can differ from other sizes, which is why this size has its own price comparison.