Hypnos Imperial Ortho Supreme King Size Mattress
The Hypnos Imperial Ortho Supreme is a firm pocket sprung mattress from Hypnos, an NBF-approved manufacturer.
- Firm feel for back & heavier sleepers
- Helps keep your spine aligned
- Wool & cotton regulate temperature
£1,229
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Hypnos Imperial Ortho Supreme Mattress
More available sizes
Mattress details
Mattress
Hypnos Imperial Ortho Supreme Mattress
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Wool
Orthopaedic
Natural
Depth (cm)
28
Layers
5
Layer Details
Cover
An unbleached cotton cover that achieves fire resistance without FR chemicals, which means a cleaner, fresher sleep surface. It feels natural rather than synthetic against your bedding.
eOlus™ Fibres
Resilient eOlus fibres sit just beneath the cover, offering body support while letting air and moisture pass through easily. In practice, that means less heat building up around you overnight.
RWS Certified British Wool
Layers of British wool, certified by the Responsible Wool Standard, cushion your whole body so you dip into the surface just the right amount. Wool also insulates naturally, keeping you warmer in winter.
Sustainably Sourced Cotton
Responsibly sourced cotton wicks away excess moisture, which means the surface stays feeling fresh through the night. It works alongside the wool to regulate temperature all year round.
ReActive™ 7-Turn Pocket Springs
A support unit of ReActive 7-turn pocket springs, each moving independently to align your spine as you change position. That translates to targeted support at your hips and shoulders rather than a one-feel-fits-all base.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- 75cm each, every night: Two people sharing get 75cm each, which means you can turn over without negotiating for territory or drifting into your partner's half.
- Less disturbance on different schedules: If one of you gets up hours before the other, the individually moving pocket springs keep that early exit from travelling across the mattress.
- Length for taller sleepers: At 200cm long, the UK king adds 10cm of length over the UK Double, a real difference for anyone approaching six foot.
- Firm support spread across a wider surface: The firm feel suits back sleepers and heavier sleepers, and the extra width means each of you gets that support without compromising position.
- Natural fillings across a bigger bed: Wool and cotton fillings breathe better than foam, so a larger shared surface stays cooler when two bodies are warming it overnight.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, especially if one of you sleeps earlier or rises first. It also suits couples where one partner is tall enough to hang off a standard-length mattress, since the UK king runs to 200cm. And if a dog has quietly claimed a corner of the bed, the extra width absorbs that too.
Consider another size if...
Your bedroom is smaller than our suggested minimum of 2.7m x 2.9m, or you sleep alone. In either case we'd recommend the UK double instead, which needs a room of at least 2.6m x 2.8m.
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FAQ's
Is a UK king big enough for a couple on the Hypnos Imperial Ortho Supreme?
For most couples, yes. The UK king gives 75cm each for two people sharing, and because each ReActive 7-turn pocket spring moves independently, your partner changing position or getting up early is felt far less on your side. If you both sprawl, or a pet routinely joins you, the UK super king adds another 30cm of width.
Will the UK king Hypnos Imperial Ortho Supreme suit a tall sleeper?
This is often the deciding factor. The UK king is 200cm long, which is 10cm longer than the UK double, so a sleeper approaching or over six foot gets their feet on the mattress rather than at its edge. The UK super king is the same length, so sizing up further only buys width, not extra legroom.
What room size do I need for a UK king Hypnos Imperial Ortho Supreme?
We suggest a room of at least 2.7m x 2.9m, which leaves space to walk around the bed and open wardrobe doors. Measure carefully in a new build master bedroom: they can look generous empty but tighten quickly once fitted storage goes in. If yours falls short, the UK double needs at least 2.6m x 2.8m.
How does the UK king compare with the UK super king in this mattress?
The UK king is 30cm narrower than the UK super king, and the two are the same length. The UK super king suits couples who want maximum separation, but we suggest a room of at least 3m x 2.9m for it. For most bedrooms the UK king is the more practical shape, without giving up length.
Where can I buy the Hypnos Imperial Ortho Supreme in a UK king?
Compare the retailers listed on this page. The prices shown here are live and updated as retailers change them, so it's worth checking back before you commit. Make sure any listing specifies the UK king at 150 x 200cm, or 5ft x 6ft 6in, since Hypnos also makes this mattress in EU sizes that differ slightly.