Simba Hybrid Ultra Mattress
Mattress
Simba Hybrid Ultra Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
34
Layers
Layer Details
- Construction. Simba describes the Hybrid Ultra as eleven layers of natural materials paired with its most advanced signature tech. The brand doesn't break down each layer individually on its page, but the overall build comes to a substantial 34cm depth.
Layer details from simbasleep.com product page, September 2026.
- The classic couples' footprint: At 135 x 190cm, the UK double is the long-established shared size, which means it fits comfortably in rooms where a UK king would crowd the walking space.
- Fits most UK bedrooms: We suggest allowing at least 2.6m x 2.8m, which most UK doubles bedrooms manage while still leaving room for a wardrobe and bedside tables on both sides.
- Deep build, sensible width: You get the full 34cm, eleven-layer construction in a size that still turns the stairs of an older terrace more easily than the wider options.
- Medium firm support for two: The medium firm feel suits back and combination sleepers, which matters more when two people with different sleep styles share one surface.
- Easy to dress: Double sheets and duvets are stocked everywhere, although the 34cm depth means you'll need deep fitted sheets specifically.
This size suits you if...
You share the bed every night and your room sits around the typical UK size, where a UK king would leave the space feeling cramped. It also suits solo sleepers who want proper room to stretch out, or who share with a pet that claims a corner. And it's a sensible choice for a guest room that regularly hosts visiting couples.
Consider another size if...
You and your partner both like space, and your room can take something bigger. The UK king is 15cm wider and 10cm longer than the UK double, and we'd recommend it if you have around 3m in each direction.
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Is the Simba Hybrid Ultra double big enough for two adults?
It works for most couples. The UK double gives 67.5cm each for two people sharing, which is the traditional standard, though broader sleepers or restless partners may feel the limit. The 34cm build helps absorb movement across the surface, so you feel less of your partner turning over than on a slimmer mattress.
What room size do I need for the Simba Hybrid Ultra in a UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That's our guidance rather than Simba's. At 135 x 190cm the UK double leaves space for bedside tables on both sides in most rooms, which the wider sizes often don't.
Will the Simba Hybrid Ultra double fit up a narrow staircase?
It's easier to move than the wider sizes, but this is a deep, heavy mattress, so a turning staircase in an older terrace or a tight new build landing still needs thought. Measure the tightest point of the route before ordering, and plan for two people carrying it.
Should I get the Simba Hybrid Ultra in a double or a king?
The UK double is 15cm narrower and 10cm shorter than the UK king. If your room comfortably clears 3m x 3m and you both value space, the UK king is the better long-term buy. If space is tighter, or you want walking room around the bed, the UK double is the sensible pick.
What bedding fits the Simba Hybrid Ultra double?
Standard double sheets and a 200 x 200cm double duvet fit the 135 x 190cm footprint, and both are widely stocked at every price. The one catch is the 34cm depth: ordinary fitted sheets won't stretch over it, so buy deep or extra-deep fitted sheets.