Hypnos Ultimate Ortho Double Mattress
The Hypnos Ultimate Ortho is an extra firm mattress built around Hypnos's ReActive 6-turn pocket springs, which means each spring responds independently to your body rather than the whole surface moving as one.
- Extra-firm for back & front sleepers
- Breathable, chemical-free cover
- Comfort layer keeps its shape
£729
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Hypnos Ultimate Ortho Mattress
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Mattress details
Mattress
Hypnos Ultimate Ortho Mattress
Size
Firmness
Extra Firm
Construction
Pocket Spring
Orthopaedic
Eco-Friendly
Depth (cm)
26
Layers
3
Layer Details
Cover
A 100% viscose, chemical-free cover that feels silky against the skin. It's breathable too, which helps air move away from your body overnight.
Comfort fillings
Natural cotton is combined with Solotex, a recycled fibre. The cotton regulates temperature while the Solotex adds resilience, so the comfort layer keeps its shape rather than flattening quickly.
Support system
Hypnos's ReActive 6-turn pocket spring system, engineered for total spinal and body support. Each spring works independently, sensing your comfort and support requirements, which means less roll-together and more even pressure relief.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- A shared size that fits most rooms: At 135 x 190cm, or 4ft 6in x 6ft 3in, it works in rooms where a UK king would leave little space to move around.
- Independent springs matter more when sharing: The ReActive 6-turn pocket springs respond to each sleeper separately, which means less roll-together across a width two people are sharing.
- Room for bedside tables on both sides: We suggest a room of at least 2.6m x 2.8m, which usually leaves space for a table each rather than one of you going without.
- Bedding is easy and cheap to find: Standard double sheets and a 200 x 200cm double duvet are stocked everywhere, so dressing the bed costs less than the larger sizes.
- A sensible guest room choice: A UK double sleeps visiting couples comfortably, and the extra firm feel holds its shape well in a bed that is used only occasionally.
This size suits you if...
You share the bed every night, you both prefer a very solid, extra firm feel, and your bedroom sits around the 2.6m x 2.8m mark where a UK king would dominate. It also makes sense if you're furnishing a guest room for visiting couples, or you sleep alone and want space to spread out, perhaps with a dog or cat claiming their usual corner.
Consider another size if...
You and your partner both want more personal space and your room measures at least 2.7m x 2.9m. In that case we'd recommend the UK king instead, which is 15cm wider and 10cm longer than the UK double.
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FAQ's
How much space does each person get on a UK double Hypnos Ultimate Ortho?
Two people sharing a UK double get 67.5cm each. That's workable for most couples, and the ReActive pocket springs help here: each spring moves independently, so your partner turning over disturbs you less than it would on an open coil mattress. Restless sleepers or broad-shouldered couples may still prefer the UK king, which is 15cm wider.
Will the Hypnos Ultimate Ortho in a UK double fit up a narrow staircase?
It's a 135 x 190cm pocket sprung mattress, 26cm deep, and it doesn't arrive rolled, so it goes up the stairs at full size. In older terraces with turning stairs, or new builds with tight landings, measure the awkward point before ordering. A UK double is the largest size many staircases can take without a struggle.
Is the UK double a good guest room size for this mattress?
Yes, with one caveat. A UK double sleeps visiting couples properly, and the cotton and Solotex fillings hold their shape well in a bed that's used in bursts rather than nightly. The caveat is firmness: this is an extra firm mattress, and lightweight guests or committed side sleepers may find it a little unyielding.
Does a room need to be a certain size for the UK double?
We suggest at least 2.6m x 2.8m. That allows the bed, a wardrobe and a chest of drawers without the room feeling cramped, which matters in a second bedroom or a first flat. If you want bedside tables on both sides plus easy walking space, closer to 3m x 3m is the comfortable norm.
Should a couple size up from the UK double for an extra firm mattress?
Extra firm surfaces let you lie closer to the edge without the side collapsing, so the UK double's 67.5cm per person goes slightly further here than on a softer mattress. That said, if either of you sprawls, the UK king adds 15cm of width and 10cm of length, provided your room meets our suggested 2.7m x 2.9m minimum.