Simba Hybrid Luxe Mattress
Mattress
Simba Hybrid Luxe Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
31
Layers
8
Layer Details
- Soft, cooling cover. A zip-off, washable cover with Stratos tech that prevents heat build-up, which means you can keep it fresh without wrestling the whole mattress. Hot sleepers should notice the difference on warm nights.
- Bamboo infused wool layer. British wool infused with moisture-wicking bamboo for better breathability. Wool naturally regulates temperature, so this layer helps in winter as well as summer.
- Fresh Simbatex foam layer. Simba's own foam with enhanced airflow and superior elasticity, which means cushioning that springs back quickly rather than leaving you feeling stuck.
- Two layers of Aerocoil springs. A double layer of patented microsprings arranged in thirteen supportive zones. These target parts of the body with specific needs, like your back, hips and shoulders.
- Stabilising core foam layer. A CertiPUR foam layer that provides structural support and extra airflow. It keeps the layers above it working consistently.
- Micro spring support layer. An extra layer of up to 900 high carbon steel microsprings for maximum support. This is where the mattress earns its medium-firm side.
- SupportCore sprung base. Up to 1,000 pocketed, tempered steel barrel springs giving firm, edge-to-edge support with no roll-off. That means you can use the full width of the bed, right to the edge.
- High-density foam base and cover. CertiPUR foam with a breathable cover made from recycled yarn. It gives the whole mattress its stability.
Layer details from simbasleep.com product page, September 2026.
- Real room for one: At 120cm across, the UK small double is 30cm wider than the UK single, which means a solo sleeper can change position freely without nearing an edge.
- Fits where a double won't: It's 15cm narrower than a UK double, so it slots into box rooms, studios and loft conversions where a 4ft 6in frame would block the walkway.
- Usable to the very edge: The sprung SupportCore base gives firm edge-to-edge support, so on a narrower mattress like this you can genuinely sleep across the full 120cm width.
- Cool in a small room: Compact bedrooms warm up quickly, and the zip-off cooling cover with bamboo-infused wool helps the mattress shed heat rather than store it overnight.
- Comfort for occasional guests: The medium-firm feel with a cushioned surface suits most visiting sleepers, which makes it a generous choice for a guest room that hosts couples a few weekends a year.
This size suits you if...
You're a solo adult who has outgrown a single and wants space to sprawl without giving your room over to a bigger bed. Or your second bedroom, loft conversion or rented flat simply cannot take a 135cm mattress and still leave space to walk. It also suits a guest room where couples stay occasionally rather than nightly, and you'd rather they slept well than politely.
Consider another size if...
You share the bed every night, in which case 120cm will feel tight over time. We'd recommend the UK double instead, or the UK king if the room allows, since couples benefit most from the wider zoned support.
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Is a small double big enough for the Simba Hybrid Luxe to make sense?
Yes, if you sleep alone or host occasional guests. The full construction is present at 120 x 190cm, including the thirteen support zones and edge-to-edge sprung base, so a solo sleeper gets the complete experience. Where it makes less sense is nightly couple use, which the UK small double is too narrow to serve comfortably.
How much space does the Simba Hybrid Luxe small double need in a room?
The mattress itself is 120 x 190cm, and we suggest a room of at least 2.4m x 2.8m so you can walk round the bed and open drawers. That's our guidance rather than Simba's. Measure the usable floor after wardrobes, not the room on the plan, especially in a loft with sloping ceilings.
Will a small double Simba Hybrid Luxe fit up a narrow staircase?
It arrives rolled and boxed, which helps on tight stairs and in loft conversions. Bear in mind the Luxe is a heavy, 31cm-deep mattress even in this size, so once it's expanded you won't easily move it again. Get it to the right room before opening the packaging.
Can two adults share this size every night?
For the odd weekend, yes, and the edge support means neither person feels perched. As a permanent arrangement, 120cm gives a couple less width than each would have on two UK singles, so someone always compromises. If you share nightly, size up to the UK double at 135cm.
What sheets fit the Simba Hybrid Luxe in a small double?
You need small double (4ft) fitted sheets, and because this mattress is 31cm deep, look for deep or extra-deep versions or the corners will pull loose. A standard double duvet works fine on top. 4ft is a standard UK size, so bedding and frames are straightforward to find.