Simba Hybrid Mattress
Mattress
Simba Hybrid Mattress
Size
Firmness
Medium-firm
Construction
Foam
Pocket Spring
Hybrid
Rolled
Depth (cm)
25
Layers
5
Layer Details
1. Breathable knitted cover
A soft knitted cover with a zip off top layer you can machine wash.
2. Simbatex comfort layer
An extra deep, open structure foam infused with graphite, designed to cushion while moving heat away from the body.
3. Aerocoil microspring layer
Up to 1,900 conical titanium alloy microsprings, made in Leeds, that compress individually, which means support that follows your body and less movement felt across the bed.
4. Stabilising core foam
A thick, open structure CertiPUR certified foam layer that aids structural support and airflow.
5. Nine zoned support base
A zoned CertiPUR foam base giving firmer support where heavier areas like hips and shoulders need it.
Specification: Simba, September 2026.
- Made for sharing in normal-sized rooms: At 135cm wide it fits comfortably where a UK king would crowd the walls, so most couples can keep bedside tables on both sides.
- Movement stays on their side: The Aerocoil microsprings compress individually, which matters most at this shared width: a restless partner is felt less across 135cm than you might expect.
- Cooler for two: Two bodies generate more heat than one, and the graphite infused Simbatex layer is designed to draw that warmth away rather than trap it.
- Easy to dress and replace: Double sheets and 200 x 200cm duvets are stocked everywhere at every price, useful if you're furnishing a whole home and bedding is one more line on the list.
- Manageable to move in: The UK double is the easiest couples' size to get up turning stairs in older terraces or round a tight new build landing.
This size suits you if...
You share the bed every night and your room suits the classic couples' footprint, or you're a solo sleeper who wants space to spread out, perhaps with a dog or cat claiming a corner. It also works well in a guest room that needs to sleep visiting couples without swallowing the floor space.
Consider another size if...
You and your partner both like room to sprawl, or one of you is broad shouldered. At 67.5cm each for two people sharing, a UK double can feel snug, and we'd recommend the Simba Hybrid in a UK king instead if your room allows it.
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What size room do I need for a Simba Hybrid double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves space to walk round the bed and open a wardrobe. If your room is a typical second bedroom or first flat with a wardrobe and drawers already in place, the UK double usually still fits.
How much space does each person get on a Simba Hybrid double?
Two people sharing get 67.5cm each. That's the traditional couples' allowance and most pairs find it fine, helped here by the microsprings keeping movement localised. If either of you sleeps starfish-style, the UK king adds 15cm of shared width and may be the better call.
Is the Simba Hybrid double a good choice for a couple who sleep warm?
Two sleepers at 135cm wide means shared body heat, which is where the graphite infused Simbatex layer helps by moving warmth away from the surface. Across reviews the Hybrid is regarded as a cooler-than-average foam feel, so a warm couple on a double shouldn't need to size up purely for temperature.
Should I buy the Simba Hybrid in a double or size up to the king?
The UK double suits most bedrooms and most couples; the UK king is 15cm wider but needs a larger room, and we'd want more than our suggested 2.6m x 2.8m minimum before recommending it. If your room is generous and you both value space, size up. Otherwise the UK double is the sensible balance.
Will a Simba Hybrid double fit up narrow stairs?
The mattress measures 135 x 190cm and is 25cm deep, which is generally the easiest couples' size to manoeuvre round turning stairs in older terraces or tight landings in new builds. Simba doesn't publish a boxed size or weight for the UK double, so check the brand's own guidance if your access is unusually tight.