Hypnos Orthos Support 6 Firm Mattress
Mattress
Hypnos Orthos Support 6 Firm Mattress
Size
Firmness
Firm
Construction
Depth (cm)
Layers
2
Layer Details
- Cotton comfort layers. Four layers of cotton sit at the top of the mattress. Cotton is breathable and wicks moisture, which means a cooler, drier feel through the night than synthetic fillings tend to give.
- ReActive 6-turn pocket springs. The support core uses Hypnos's ReActive 6-turn pocket springs, each one working independently. That means the mattress contours to your body and limits motion transfer across the bed.
Layer details from mattressman.co.uk product page, September 2026.
- Firm support with room to move: The UK small double is 30cm wider than the UK single, so a solo adult can change position freely on this firm surface without teetering near an edge.
- A double feel for a compact room: At 15cm narrower than the UK double, it can be the difference between a door that clears the bed frame and one that doesn't.
- Springs that stay quiet at this width: The ReActive 6-turn pocket springs respond individually, which means an occasional guest turning over is less likely to disturb the person beside them.
- Cotton layers in smaller rooms: Four cotton comfort layers breathe and wick moisture, useful in box rooms and loft conversions where air can sit warm and still around the bed.
- Easy to dress: The 4ft small double is a standard UK size, so fitted sheets and frames are simple to find, and a standard double duvet covers it comfortably.
This size suits you if...
You sleep alone, prefer a properly firm mattress and have outgrown a single but can't spare the width a UK double demands. Or you're furnishing a guest room or holiday let second bedroom where couples stay occasionally rather than nightly. It also suits a teenager who needs firm back support and more width, in a room that can't lose much floor space.
Consider another size if...
You share the bed every night, because 120cm is snug for two adults long term. If your room measures at least 2.6m x 2.8m, we'd recommend the UK double instead, which is 15cm wider and the same length.
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Is a small double big enough for two people every night?
For occasional stays, yes: the pocket springs limit motion transfer, so sharing for a weekend works fine. For nightly couple use, 120cm of width is tight, especially on a firm mattress where you lie on the surface rather than settle into it. In that case the UK double or UK king is the better long-term buy.
How big is the Hypnos Orthos Support 6 in a small double?
This size measures 120 x 190cm, or 4ft x 6ft 3in. That's 30cm wider than the UK single and the same length, so you gain sideways stretching room without needing a longer room. We suggest a bedroom of at least 2.4m x 2.8m to keep walkways usable.
Will the small double fit in a box room or loft conversion?
Usually, yes, and that's much of its appeal. Being 15cm narrower than the UK double, it fits rooms where a standard double blocks the door swing or leaves no path to the window. Measure your usable floor, allowing for sloped ceilings in a loft, against our suggested minimum of 2.4m x 2.8m.
What bedding do I need for this size?
You'll need small double (4ft) fitted sheets, which are a standard UK size and easy to find, paired with a standard double duvet, which drapes generously over the 120cm width. The cotton comfort layers pair well with breathable natural bedding if you tend to sleep warm.
Should I size up to the UK double instead?
If the bed is for one person, probably not: the small double already gives a solo sleeper plenty of firm, supportive width. Size up if a partner will share regularly and your room measures at least 2.6m x 2.8m. Compare prices for both sizes using the retailers listed on this page.