Simba Hybrid Pro Core King Size Mattress
The Simba Hybrid Pro Core Mattress combines a Stratos cool-touch cover and British wool with Aerocoil microsprings, which means you get a breathable surface and targeted support at your hips and shoulders.
- Cool-touch cover keeps you fresher
- Targeted support at hips & shoulders
- 200-night trial & 10-year guarantee
£1,249
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Simba Hybrid Pro Core Mattress
More available sizes
Mattress details
Mattress
Simba Hybrid Pro Core Mattress
Size
Firmness
Medium Firm
Construction
Foam
Hybrid
Pocket Spring
Wool
Depth (cm)
28
Layers
8
Layer Details
Soft, cooling cover
A zip-off, washable cover with Stratos tech that prevents heat build-up. It keeps the surface cooler and is easy to keep clean.
Natural wool layer
A soft layer of British wool that Simba says enhances breathability and comfort. It helps the surface feel fresh and cushioned.
Fresh Simbatex foam
Foam designed to enhance airflow, with elasticity for cushioning. You get some give on top without trapping heat.
High-elasticity CertiPUR foam layer
A CertiPUR foam layer engineered for elasticity. It adds a cushioned feel and springs back as you move.
Titanium alloy Aerocoil springs
Patented microsprings designed to support parts of the body with specific needs, such as hips and shoulders. They respond independently, so support is targeted where you need it.
Stabilising core foam layer
A CertiPUR foam layer that provides structural support and extra airflow. It steadies the layers above and helps air move through the mattress.
SupportCore sprung base
Up to 1,000 pocketed, tempered steel barrel springs for firm edge-to-edge support with no roll-off. You can sit or sleep near the edge and still feel supported.
High-density foam base
A CertiPUR foam base that works with the SupportCore springs to deliver stability and support. It gives the whole mattress a steady foundation.
Layer details from simbasleep.com product page, November 2026.
Key benefits
- More room each than a UK double: You get 75cm each for two sharing, which is 7.5cm more per person than the UK double, so elbows and knees meet a little less often.
- Extra length for tall partners: The UK king is 10cm longer than the UK double, which means a partner approaching six foot is less likely to have feet hanging off the end.
- Less disturbance from early risers: Independently responding Aerocoil microsprings plus the extra width help limit how much one partner's movement reaches the other, useful if one of you gets up hours earlier.
- Usable edges on a wider bed: The pocketed SupportCore base gives firm edge-to-edge support, so both sides of the UK king stay usable for sitting, getting up or sleeping near the edge.
- Space for pillows and repositioning: During pregnancy or the months after, the UK king leaves room for a support pillow without pushing your partner towards the edge.
This size suits you if...
You share the bed every night and the UK double has begun to feel tight, one of you is tall enough that length matters as much as width, or you keep different hours and want a bit more distance from a partner who gets up early.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m once wardrobes are in. We'd recommend the UK double instead, with at least 2.6m x 2.8m.
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FAQ's
How much room does each person get on the Simba Hybrid Pro Core UK king?
Two people sharing get 75cm each on the 150 x 200cm UK king. That is 7.5cm more per person than the UK double, which gives 67.5cm each. If you want more again, the UK super king gives 90cm each, though it needs a larger room.
Is the Simba Hybrid Pro Core king size long enough for someone over six foot?
The UK king is 200cm long, 10cm more than the UK double and UK small double. For a partner around six foot, that extra length is often the real reason to size up. The UK super king is the same length, so going bigger adds width only.
What size bedroom do I need for a UK king Simba Hybrid Pro Core?
We suggest allowing at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable. New build master bedrooms can feel smaller once fitted wardrobes and bedside tables go in, so measure the space you actually have left before choosing.
Should we choose the UK king or UK super king Simba Hybrid Pro Core?
The UK king is 30cm narrower than the UK super king and gives 15cm less each, but both are 200cm long. If your main complaint is length, or space in your room is limited, the UK king suits you better. The UK super king suits couples who still feel crowded at 75cm each or share the bed with a dog.
What bedding fits a Simba Hybrid Pro Core in a UK king?
Standard UK king sheets fit the 150 x 200cm surface, and a 230 x 220cm king duvet covers it well. The mattress is 28cm deep, so check that fitted sheets list a pocket depth that suits it before you buy.