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.
- More room each than a UK double: You each get 75cm of width, which is 7.5cm more per person than the UK double and enough to stop elbows meeting halfway through the night.
- Length for taller sleepers: At 200cm long, the UK king is 10cm longer than the UK double, so a partner over six foot is less likely to find their feet at the edge.
- Less disturbance on different schedules: The pocket springs respond to each person separately, and the UK king's extra width puts a little more distance between you when one partner gets up at dawn.
- Firm support across a wide surface: The firm feel suits back and front sleepers sharing a bed, although a lightweight side sleeper may find the thin foam layer a little unforgiving at the hips.
- Stays put on a larger base: The non-slip base helps a mattress of this width sit squarely on slats or a divan, rather than creeping when two people turn over.
This size suits you if...
You share a UK double and keep disturbing each other, one of you leaves for work hours before the other wakes, or one partner is tall enough that a 190cm bed already feels short.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m once wardrobes and bedside tables are in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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Is the SleepSoul Nebula UK king big enough for two adults?
For most couples, yes. The UK king gives you 75cm each, which is 7.5cm more per person than the UK double. That extra width is modest on paper, but it is often the difference between sleeping side by side and sleeping on top of each other's space.
Will I feel my partner getting up on a SleepSoul Nebula king size?
Less than you would on an open-coil mattress of the same size. The pocket springs move individually, and on a UK king there is 15cm more width than a UK double between you. A very light sleeper may still notice some movement, as the comfort layer on top is thin.
Is the SleepSoul Nebula UK king long enough for someone over 6ft?
The UK king is 200cm long, 10cm longer than the UK double and the other smaller sizes of this mattress. If one of you is over six foot, that added length is often the real reason to size up, because it gives room for a pillow without feet reaching the end.
Does the SleepSoul Nebula come in a UK super king?
No. SleepSoul makes the Nebula Orthopaedic from UK single up to UK king, so the UK king is the widest option in this range. If you need more than 75cm each, you would have to look at a different mattress.
Will a SleepSoul Nebula UK king fit in a new build master bedroom?
Measure after the wardrobes go in, as new build rooms often shrink once furnished. We suggest at least 2.7m x 2.9m for a UK king. If your room falls short, the UK double of this mattress needs at least 2.6m x 2.8m.