Simba Hybrid Pro Core Super King 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
£1,349
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Simba Hybrid Pro Core Mattress
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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
- Room to move apart: Each sleeper gets 90cm of width, which means a partner who turns over all night is far enough away that you are less likely to feel every shift.
- Usable right to the edge: The SupportCore base of up to 1,000 pocketed springs is built for edge-to-edge support, so whoever ends up on the outside still has firm footing when a child climbs in.
- Extra width with no extra length: It is 30cm wider than the UK king and exactly the same length, so the gain is all side-to-side room for elbows, children or pets.
- Steady feel across a wide surface: Independent Aerocoil microsprings respond to each body separately, which helps when two adults of different weights share a bed this broad.
- Cover you can wash: The zip-off cover goes in the washing machine, a real help on a bed where muddy paws or a poorly child are part of normal life.
This size suits you if...
You and your partner sleep badly together and want more distance between you, or a child or a large dog regularly joins you overnight. It also fits a generous period bedroom or new build master bedroom, where a UK king would look a little lost against the wall.
Consider another size if...
Your bedroom measures under our suggested 3m x 2.9m, or the stairs and landing are tight. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
Is the Simba Hybrid Pro Core super king big enough for two adults and a child?
For occasional visits, yes. The UK super king gives 90cm each to two adults, and the edge-to-edge spring base means the outer strip of the bed stays supportive rather than sagging, so a small child squeezed in the middle still leaves both adults usable space. A child who sleeps there every night will make it feel narrower, but it remains the widest standard UK size.
How much bigger is the Simba Hybrid Pro Core super king than the king?
The UK super king is 30cm wider than the UK king and the two are the same length. Shared between two people, that works out at 15cm more each, since the UK king gives 75cm per sleeper and the UK super king gives 90cm. If length is your problem rather than width, sizing up won't help.
What size bedroom do I need for a super king Simba Hybrid Pro Core?
We suggest at least 3m x 2.9m for a UK super king, and around 3.5m x 3.2m tends to feel comfortable once you add bedside tables on both sides. In a loft conversion, check where the ceiling slopes first, because the sloping wall usually dictates which wall the headboard can go against.
Will a super king hybrid mattress fit through my door and up the stairs?
Measure before you order. The mattress is 180 x 200cm and 28cm deep, and with springs inside it is not something you can bend around a tight corner. Check how far your bedroom door opens, the turn at the top of the landing and any low ceiling on the stairs, then compare the retailers listed on this page.
What sheets and duvet fit a Simba Hybrid Pro Core super king?
You need super king fitted sheets, and a 260 x 220cm duvet hangs properly over the sides. Look for fitted sheets with deep corners, because this mattress is 28cm deep. Bedding at this size usually costs more than for a UK king, so factor in a spare set if pets or children share the bed.