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.
- Flagship comfort in a one-person footprint: At 90cm wide it fits where larger sizes can't, so a solo sleeper in a compact room still gets the full eleven-layer build.
- Room to live around it: The UK single is 45cm narrower than the UK double, which in a small bedroom is the difference between a desk fitting and not.
- Suits a spare room that earns two jobs: A single leaves a study or box room usable as an office most of the year, with a genuinely comfortable bed when guests stay.
- Loft and awkward rooms: The narrow footprint slots under sloped ceilings and into alcoves where anything wider would block the walkway.
- Medium firm for growing and grown sleepers alike: The medium firm feel suits teenagers and adult back sleepers, though very lightweight side sleepers may find it slightly solid.
This size suits you if...
You sleep alone and want a properly deep, substantial mattress without moving up to a size your room can't take, you're kitting out a teenager's room for the long haul rather than buying a cheap stopgap, or you have a spare room set up as a single and want guests to sleep as well as you do.
Consider another size if...
You share the bed, or you're a single adult with the floor space for something roomier, since 90cm is snug for a larger frame. We'd recommend the Simba Hybrid Ultra in a UK double instead.
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Will the Simba Hybrid Ultra single fit a bunk bed or mid sleeper?
Be careful here. The Hybrid Ultra is 34cm deep, and raised frames rely on the guard rail sitting well above the mattress surface. On many bunks and mid sleepers a mattress this thick would leave too little rail exposed to be safe. Check your frame's maximum mattress depth before buying; a slimmer mattress usually suits these frames better.
What room size do I need for a Simba Hybrid Ultra in a UK single?
The mattress itself is 90 x 190cm, and we suggest allowing at least 2.1m x 2.8m of floor space so you can walk around the bed and open drawers comfortably. That's our guidance rather than Simba's. In practice a single fits almost any UK bedroom, including box rooms and loft conversions with a narrow usable strip.
Is the Simba Hybrid Ultra single worth it for a child's room?
For a young child, probably not: this is Simba's flagship, and a growing child won't feel the benefit of the premium build over a mid-range single. For a teenager who'll use it for years, the case is stronger. The medium firm feel suits developing backs, though lightweight kids may find it a little firm.
How much narrower is a UK single than a UK double?
The UK single is 45cm narrower than the UK double, at 90cm wide against 135cm. That saved width matters in a compact bedroom or a spare room doubling as an office, where a UK double would swallow the floor space you need for a desk or wardrobe. For one sleeper, 90cm is comfortable if a little cosy.
Where can I buy the Simba Hybrid Ultra in a UK single?
Stock varies by size, so the simplest approach is to compare the retailers listed on this page. The prices shown here are updated as retailers change them, which matters on a mattress at this level, where discounts come and go. Standard single bedding fits, though the 34cm depth means you'll need deep fitted sheets.