Simba Natural Hybrid Source Double 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
£974
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Simba Natural Hybrid Source Double Mattress
Simba Natural Hybrid Source Mattress
More available sizes
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
- The classic shared size: At 135 x 190cm (4ft 6in x 6ft 3in), the UK double has been Britain's standard couples' size for decades, and it still fits most bedrooms comfortably.
- Room left for furniture: We suggest a room of at least 2.6m x 2.8m, which most main bedrooms clear with space for a wardrobe and drawers besides.
- Bedside tables on both sides: Being 15cm narrower than the UK king, the double is often the difference between fitting a table each side or squeezing one against the wall.
- Support that doesn't shrink: The 28cm depth and medium firm feel are identical in the double, so choosing this size over a larger one costs you nothing in comfort.
- Sleeps cooler as a pair: Two people warm a bed quickly, and the sprung hybrid core allows more airflow than an all-foam mattress, which helps on close summer nights.
This size suits you if...
You share the bed most nights and want the traditional couples' size without giving a whole room over to it, you're furnishing a first flat or a new home and need a bed that fits a typical UK bedroom alongside a wardrobe and drawers, or you're setting up a guest room that has to work properly for visiting couples.
Consider another size if...
You and your partner are both broad-shouldered or restless, and 67.5cm each will feel tight over years of sharing. If your room allows it, we'd recommend the UK king instead for the extra width.
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FAQ's
Is the Simba Natural Hybrid Source double big enough for a couple?
For most couples, yes. Two people sharing get 67.5cm each, which is comfortable if you both sleep fairly still. The medium firm hybrid build keeps you supported to the edges rather than rolling together in the middle. Larger couples, or anyone who spreads out, may find the UK king a better long-term choice.
Will the Simba Natural Hybrid Source in a UK double fit my bedroom?
The mattress measures 135 x 190cm, and we suggest a room of at least 2.6m x 2.8m so you can walk round the bed and open drawers. Around 3m x 3m is the comfortable norm. Most UK main bedrooms, and plenty of second bedrooms, meet that without trouble.
Should I buy the Simba Natural Hybrid Source in a double or a king?
The UK double is 15cm narrower than the UK king, and that gap matters in a modest room: it can be what lets you keep bedside tables on both sides. If your bedroom is generous and you both like space, size up. If floor space is tight, the double is the sensible call.
Is the double Simba Natural Hybrid Source hard to get upstairs?
At 28cm deep with a sprung core, it's a substantial mattress, though the double is one of the easier sizes to manoeuvre through older terraced staircases and tight new build landings. Simba doesn't publish a weight for this size, so check your access, particularly turning stairs, before delivery day.
Where can I compare prices for the Simba Natural Hybrid Source in a UK double?
Right here. The prices shown on this page come from the retailers currently stocking the UK double, and they're updated as retailers change them. It's a quicker route than checking each shop yourself, and the same mattress can vary noticeably between stockists at any given time.