SleepSoul Space 4000 Pocket Orthopaedic Gel Mattress
Mattress
SleepSoul Space 4000 Pocket Orthopaedic Gel Mattress
Size
Firmness
Firm
Construction
Depth (cm)
38
Layers
7
Layer Details
- Tencel knitted cover. A soft knitted Tencel cover with antibacterial properties, which wicks away moisture to keep the sleep surface dry and cool. A sensible starting point if you tend to sleep warm.
- Microquilted layer. A traditionally microquilted layer that adds a touch of surface comfort. It gives the top of the mattress a gently cushioned, finished feel.
- Pillow top. An extra comfort layer for a more luxurious feel. This softens the first impression of what is otherwise a firm mattress.
- Gel Foam. A cool gel foam layer that allows greater airflow and reduces heat and moisture build-up compared with traditional memory foam. In practice, that means less of the clammy warmth some foam mattresses are known for.
- Foam comfort layer. A foam layer that helps distribute your weight evenly, which means a more balanced surface with fewer pressure points.
- Pocket springs. 2,000 full-size pocket springs made from durable steel, each individually cased in a cloth pocket. They react independently to movement, so support goes where your body needs it most.
- Mini pocket springs. A further 2,000 individually cased mini pocket springs providing added comfort and soothing pressure relief. They also help decrease motion transfer, so a partner's movements are less likely to disturb you.
Layer details from mattressonline.co.uk product page, September 2026.
- More room each: At 75cm each for two sharing, you gain 7.5cm of personal space over the UK double, which means fewer elbows and knees meeting in the middle of the night.
- Length for taller partners: At 200cm, the UK king is 10cm longer than a UK double, so a partner approaching 6ft can stretch out without their feet reaching the edge.
- Fewer early morning wake-ups: The extra width puts more distance between you, and the 2,000 mini pocket springs help limit motion transfer, so an early alarm is less likely to rouse the other sleeper.
- Fits where a super king won't: We suggest at least 2.7m x 2.9m for a UK king, against 3m x 2.9m for the UK super king, so it suits bedrooms where a super king would crowd the floor.
- Each side supports its own sleeper: The individually cased pocket springs respond to each of you separately, which means your side of the bed reacts to your body rather than your partner's.
This size suits you if...
You share the bed every night and keep disturbing each other on a UK double, one of you stands close to 6ft and wants the extra length, or you both like a firm, supportive surface more than a soft one.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m, or feels tight once wardrobes are in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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 Space 4000 king big enough for two adults?
For most couples, yes. The UK king gives you 75cm each, which is 7.5cm more each than the UK double. The one caveat is firmness rather than size: if one of you is a lightweight side sleeper, they may find this mattress a little too firm, however much room they have.
Will a king size SleepSoul Space 4000 stop my partner waking me up?
It should help if you keep different hours. The UK king is 15cm wider than a UK double, so there is more space between you, and the mini pocket springs are designed to reduce motion transfer. Across the two, someone getting up hours before you is less likely to jolt you awake.
Is the SleepSoul Space 4000 in a UK king long enough for someone over 6ft?
The UK king measures 150 x 200cm, or 5ft x 6ft 6in, so it is 10cm longer than a UK double. For a partner approaching 6ft, that extra length is often the real reason to upgrade. The UK super king is the same length, so sizing up adds width only.
Should I choose the SleepSoul Space 4000 in king or super king?
Go by your room and how much space you each want. The UK super king gives 90cm each for two sharing, so the UK king gives 15cm less each. We suggest at least 3m x 2.9m for the UK super king, while the UK king needs at least 2.7m x 2.9m.
Will a SleepSoul Space 4000 king fit in a new build master bedroom?
Often, but measure after the furniture is in. New build bedrooms can feel roomy empty and shrink quickly once wardrobes go in. We suggest at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m feeling comfortable. If you fall short, the UK double needs at least 2.6m x 2.8m.