SleepSoul Nebula Orthopaedic Pocket 600 Mattress in a Box
Mattress
SleepSoul Nebula Orthopaedic Pocket 600 Mattress in a Box
Size
Firmness
Construction
Depth (cm)
22
Layers
4
Layer Details
- Top Layer. A layer of comfort quilting on the surface, which gives the firm mattress a slightly softer initial feel. It is what your skin actually touches, so it shapes that first impression when you lie down.
- Soft Foam. 1.5cm of soft foam sits beneath the quilting, providing deep comfort through consistent weight distribution. It is a thin layer, so expect cushioning rather than a plush, sink-in feel.
- Springs. 600 pocket springs conform to your body's shape, supporting you where you need it most. Because each spring is sewn into its own fabric pocket, SleepSoul says they help prevent the roll-together effect where couples drift into the middle.
- Non Slip Fabric. An anti-slip base for additional stability, which means the mattress is less likely to shift around on slats or a divan. A simple feature, but useful in practice.
Layer details from sleepsoul.co.uk product page, September 2026.
- Room to spread out alone: The UK small double is 30cm wider than the UK single, which means you can sprawl or turn over without an arm ending up off the edge.
- No extra length to fit: It shares the UK single's length, so if you're moving up from a single, only the width of your room needs checking.
- Kinder to small rooms: Being 15cm narrower than the UK double can decide whether a door still swings open or a wardrobe stays reachable in a box room.
- Firm support for one: The 600 pocket springs follow your shape across the whole surface, which suits a back or front sleeper who likes the bed to themselves.
- Steady on a smaller frame: The non-slip base helps the mattress stay put on a 4ft frame, which helps on slatted guest beds that get used now and then.
This size suits you if...
You sleep alone and feel hemmed in on a single, you're kitting out a small spare room where couples stay for the occasional weekend, or you're fitting a bed into a loft room or studio where a full double would leave you edging round it sideways.
Consider another size if...
You share the bed with a partner every night and want space to move without disturbing each other. We'd recommend the UK double instead, and we suggest at least 2.6m x 2.8m for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the SleepSoul Nebula small double good for a teenager who has outgrown a single?
It's a sensible step up. The UK small double is 30cm wider than the UK single but the same length, so a growing teenager gets more room to move while the bed takes up only a little more floor. The firm feel suits teens who sleep on their back or front, though a lightweight side sleeper may find it a touch firm.
Will a UK small double fit in a box room?
Often, yes. We suggest allowing at least 2.4m x 2.8m for a UK small double, which leaves space to walk round the bed and open a door. Measure the room first, including where the door swings, before you buy. If your room falls below that, the UK single is the safer choice.
Can two people sleep on a SleepSoul Nebula small double for guest stays?
For a night or a weekend, most couples manage fine. The pocket springs move independently, so one guest turning over is less likely to jolt the other. For nightly sharing, the UK double gives 67.5cm each and feels much less cramped, though we suggest at least 2.6m x 2.8m of room for it.
What bed frame do I need for a SleepSoul Nebula small double?
You need a 4ft small double frame or divan, made to fit a 120 x 190cm mattress. A 4ft 6in double frame will leave a gap at the side. The non-slip base helps the mattress sit steadily on slats, but it can't make up for a frame that's the wrong size.
Should I buy the SleepSoul Nebula in a small double or a double for a spare room?
If couples stay only occasionally and the room is tight, the UK small double makes more sense, as it's 15cm narrower and keeps more floor clear. If the room regularly hosts two adults for longer stays, the UK double is the more comfortable choice, provided you can allow at least 2.6m x 2.8m.