Hypnos Ultimate Ortho Small 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
More available sizes
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
- Real space for one: At 120cm wide, it's 30cm wider than the UK single, which means a lone sleeper can stretch out without moving up to a full double frame.
- Fits where a double won't: It's 15cm narrower than the UK double, often the difference between a door that clears the bed and one that doesn't in a box room or studio.
- Extra firm support at this width: The ReActive 6-turn pocket springs respond to your body individually, so a solo back or front sleeper gets solid alignment across the whole 4ft surface.
- Copes with the occasional shared night: Independent springs mean less roll-together, so a guest room couple sharing 120cm for a weekend won't feel every turn the other makes.
- Standard 4ft sizing: The small double is a common UK size, so frames, fitted sheets and mattress protectors are easy to find without hunting for specialist bedding.
This size suits you if...
You sleep alone, find a UK single restrictive, and your room can't take anything wider than 4ft. Or you're furnishing a guest room or rental second bedroom where couples stay occasionally rather than nightly, and you want a solid, supportive mattress that holds its shape between visits. It also suits a teenager who has outgrown a single in a room that can't spare the floor space.
Consider another size if...
You and a partner would sleep on it every night, in which case 120cm is tight for two adults long term. We'd recommend the UK king instead, which is 30cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
Is the Hypnos Ultimate Ortho small double big enough for a couple?
For occasional nights, yes. The independent pocket springs limit roll-together, so two guests sharing 120cm for a weekend will manage fine. As a nightly bed for two adults it's a squeeze, and the extra firm feel gives you nowhere to sink out of each other's way. Couples sleeping on it every night should consider the UK king.
What room size do I need for the Hypnos Ultimate Ortho small double?
We suggest at least 2.4m x 2.8m. That leaves enough clearance to walk round the bed and open drawers, which matters in the box rooms and loft conversions this size usually ends up in. In a loft, check where the ceiling slopes: the small double's narrower footprint often lets you keep standing room beside the bed where a double wouldn't.
How much bigger is the small double than the single in this mattress?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the whole point: a solo adult gets proper room to spread out, and because this is an extra firm mattress you feel supported right to the edges of that wider surface rather than perched in the middle.
Should I choose the small double or the double Hypnos Ultimate Ortho?
It usually comes down to the room. The UK small double is 15cm narrower than the UK double, and both are 190cm long. If you sleep alone, the small double gives you plenty of space and an easier fit in a compact bedroom. If a partner joins you regularly and the room allows at least 2.6m x 2.8m, the UK double is the safer pick.
Will the Hypnos Ultimate Ortho small double fit a standard 4ft frame?
Yes. At 120 x 190cm, or 4ft x 6ft 3in, it matches the standard UK small double footprint, so any 4ft frame or divan base should take it. Given the mattress is extra firm, a sprung or solid slatted base in good condition will keep that support consistent. Compare the retailers listed on this page for current pricing.