SleepSoul Space Ortho Memory Pocket 4000 Boxtop Mattress in a Box
The SleepSoul Space Ortho Memory Pocket 4000 Boxtop is a firm, deep 38cm hybrid mattress delivered vacuum-packed in a box.
- Firm, finely responsive support
- Minimises partner disturbance
- 10-year guarantee
£479.74
Get the lowest price we've found
The SleepSoul Space Ortho Memory Pocket 4000 Boxtop combines 4000 pocket springs, a 2000-spring layer plus 2000 mini springs above it, with memory foam and cool gel, all topped with a plush pillow top and a breathable Tencel cover. It's available in UK Double, King and Super King. It comes with a 10-year guarantee, which gives some reassurance for the price. If you want firm support with a softer surface feel, this is a sensible shortlist candidate, although lighter sleepers may find it too solid underneath.
Mattress specifications
Firmness
Firm
Type
Hybrid
Depth (cm)
38
Number of Layers
7
Trial Period (nights)
Warranty (years)
10
Price Range
£479 to £571
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from SleepSoul's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The main draw is the spring system: 2000 full-size pocket springs with 2000 mini springs layered on top, which means the mattress can respond to your body in finer detail than a single spring layer and helps prevent the roll-together effect if you share a bed. Above that, 3.5cm of memory foam and 3.5cm of cool gel contour to pressure points while keeping movement to a minimum, useful if a restless partner tends to wake you. The Tencel knitted cover is soft and breathable, a help if you sleep warm. Yes, it arrives compressed in a box, but SleepSoul says it expands to good condition in 2 hours and great condition within 24. A 10-year guarantee backs it up.
Key features & layer details
Top Layer
A sumptuously soft pillow-top layer of plush filling sits right at the surface. This gives extra cushioning before you reach the firmer support below.
Tencel Knitted Top Fabric
The knitted cover is made from Tencel, a soft, breathable fabric. It helps the surface stay cooler through the night.
Foam Layer
A 1cm foam layer paired with 3.5cm of memory foam offers two levels of comfort and support. The memory foam element moulds gently to your shape.
Cool Gel / Memory Foam
3.5cm of cool gel acts as a transition layer, which means a controlled sink rather than a sudden drop, with movement kept to a minimum. The memory foam contours to your body and eases pressure points.
Mini Pocket Springs
An additional 2000 mini pocket springs sit above the main spring unit. These add a finer level of comfort and support close to the surface.
Pocket Springs
2000 pocket springs conform to your body's shape, supporting you where you need it most. Because each spring moves independently, they help prevent the roll-together effect on a shared bed.
Base
A non-slip fabric base adds stability. It helps keep the mattress in place on your bed frame.
Layer details from sleepsoul.co.uk product page, September 2026.
Best suited for?
Couples
Each of the 2000 pocket springs moves independently and the memory foam keeps movement to a minimum, so a restless partner is less likely to wake you.
Warm sleepers
The knitted Tencel cover is soft and breathable, which helps the surface stay cooler through the night if you tend to overheat.
Back sleepers
Firm support from the pocket spring base, with a plush pillow top above it, gives a softer surface feel without losing that supportive underlay.
Heavier sleepers
Two layers of pocket springs, 2000 full-size plus 2000 mini, sit beneath the foam, which means the firm support underneath is unlikely to bottom out.
This is a firm mattress, so lightweight side sleepers may find it doesn't let their shoulders and hips sink in enough, even with the pillow top. At 38cm deep it's a tall mattress, which can make fitted sheets awkward and raise the sleeping surface higher than some prefer. No trial period is mentioned, so cautious first-time foam buyers should factor that in.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
SleepSoul Space Ortho Memory Pocket 4000 Boxtop Mattress in a Box
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the SleepSoul Space Ortho 4000 mattress?
SleepSoul rates it as firm. The pillow top and memory foam layers soften the surface feel, which means you get cushioning at the top with solid support from the 4000 pocket springs underneath. It suits those who like a supportive base, although lighter sleepers may find it a little too firm.
How long does the SleepSoul Space Ortho take to expand?
It arrives vacuum sealed in a box. SleepSoul says it expands to good condition in 2 hours and great condition within 24 hours, so you could sleep on it the same day, though leaving it a full day is the safer bet.
Does the SleepSoul Space Ortho have a guarantee?
Yes, SleepSoul lists a 10-year guarantee on its own site. No sleep trial is mentioned, so check returns terms with your retailer before you buy if you're unsure about the firm feel.
How many springs does the SleepSoul Space Ortho 4000 have?
4000 in total: 2000 full-size pocket springs plus 2000 mini pocket springs layered above them. The two-tier design means broad support from below with a finer, more responsive feel near the surface.
What sizes does the SleepSoul Space Ortho come in?
It's available in UK Double, King and Super King. There's no single size listed, so it's aimed at larger beds.
Couldn't find an answer to your question? Send us a message