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.
- Room for a restless partner: At 90cm each for two sharing, a partner who kicks and turns has genuine distance from you, and the mini pocket springs further dampen what movement does travel.
- Space when the family piles in: A child arriving at 3am or a large dog stretched across the foot of the bed still leaves both adults a usable share of the surface.
- A full 6ft of width: The UK super king measures 6ft x 6ft 6in, so it fills a large master or period bedroom in proportion where a UK king can look a little lost.
- Firm support across the whole surface: The same firm pocket spring base runs edge to edge, which means the extra width feels just as supportive as the middle rather than becoming spare, sagging space.
- More room each than a UK king: You gain 15cm more each than the UK king at the same 200cm length, so taller sleepers lose nothing and both sides gain elbow room.
This size suits you if...
You share with a partner who tosses and turns, your children or a large dog end up in the bed most nights, and your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your bedroom falls short of 3m x 2.9m or your stairs have a tight turn. We'd recommend the UK king instead, which is 30cm narrower; allow at least 2.7m x 2.9m for the UK king.
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Is the SleepSoul Space 4000 UK super king big enough for two adults and a child?
For occasional night visits, yes. The UK super king is 180 x 200cm, giving two adults 90cm each, so a small child can squeeze in without anyone ending up on the edge. The firm surface also means a child in the middle is less likely to roll into a dip towards either parent.
SleepSoul Space 4000 super king vs king: how much extra space do you get?
The UK super king is 30cm wider than the UK king and the same 200cm length. For two people sharing, the UK king gives 75cm each, while the UK super king gives 15cm more each. That extra width is most noticeable if one of you sprawls or a pet joins you.
Will a super king mattress fit in a loft conversion bedroom?
Only if the floor space and ceiling slope allow it. We suggest at least 3m x 2.9m for a UK super king, and in a loft the sloping ceiling usually decides which wall the bed goes against. This mattress is 38cm deep, so check head height where you'll sit up, and measure the loft stairs before ordering.
Is the Space 4000 heavy to rotate in a super king size?
Yes, expect it to be hard work. The model is already heavy in smaller sizes, and the UK super king is the largest SleepSoul offers, so rotating it is realistically a two-person job. SleepSoul doesn't publish a weight for this size, so check with the retailer if lifting is a concern.
Is a super king better than a double for a restless partner?
In most cases, yes. The UK super king is 45cm wider than the UK double, giving 22.5cm more each for two sharing. On this mattress the mini pocket springs reduce motion transfer, but physical distance still makes the bigger difference, and the UK double needs a room of at least 2.6m x 2.8m against 3m x 2.9m here.