SleepSoul Space Ortho Memory Pocket 4000 Boxtop Double 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
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
SleepSoul Space Ortho Memory Pocket 4000 Boxtop Mattress in a Box
More available sizes
Mattress details
Mattress
SleepSoul Space Ortho Memory Pocket 4000 Boxtop Mattress in a Box
Size
Firmness
Firm
Construction
Foam
Pocket Spring
Hybrid
Rolled
Memory Foam
Depth (cm)
38
Layers
7
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.
Key benefits
- Fits the room you actually have: We suggest a room of at least 2.6m x 2.8m, which means most master bedrooms and many second bedrooms can take it without feeling crowded.
- Less partner disturbance at close quarters: On a UK double you sleep nearer your partner than on a UK king, so the independently moving pocket springs and the memory foam help keep their movement on their side.
- Firm edges where you share space: The firm spring system means neither of you slides towards the middle, which matters when you each have 67.5cm of the mattress.
- Easy to dress: Double bedding is sold almost everywhere, although at 38cm deep you'll want fitted sheets with a deep pocket.
- Room for bedside tables: A UK double is 15cm narrower than a UK king, which can be the difference between a bedside table on each side and squeezing past one.
This size suits you if...
You share a bed with a partner in an average-sized bedroom and want firm support without the bed taking over the floor, or you're setting up a guest room for visiting couples and need something supportive that still leaves space for a wardrobe and drawers.
Consider another size if...
You and your partner both sprawl, or one of you is broad-shouldered and 67.5cm each feels tight. We'd recommend the UK king instead, allowing at least 2.7m x 2.9m.
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.
FAQ's
Will two adults fit comfortably on the SleepSoul Space Ortho in a UK double?
Most couples will, with 67.5cm each. The firm spring base stops you rolling together, and the memory foam and cool gel layers dampen movement, which helps at this closer spacing. If you both like plenty of personal space, the extra width of a UK king will feel noticeably more relaxed.
How much bigger is the SleepSoul Space Ortho UK king than the UK double?
The UK king is 15cm wider and 10cm longer than the UK double. Shared between two, that gives 75cm each on the UK king, so the UK double gives you 7.5cm less each. The UK king needs a larger room too: we suggest at least 2.7m x 2.9m.
Can the Space Ortho UK double fit in a small second bedroom?
Often, yes. We suggest at least 2.6m x 2.8m for a UK double, with around 3m x 3m feeling comfortable once a wardrobe and drawers are in. Measure your walkways as well as the floor, since a 38cm deep mattress sits tall and can make a small room feel a little fuller.
What fitted sheet do I need for a SleepSoul Space Ortho double?
Buy a UK double fitted sheet, sized for 135 x 190cm, with a deep pocket. Standard-depth sheets often struggle to grip a 38cm mattress and can ping off the corners. A double duvet at 200 x 200cm suits the width.
Is the SleepSoul Space Ortho in a UK double a good guest bed?
For visiting couples, it's a sensible choice. The UK double sleeps two properly while leaving room in a spare bedroom for storage. The firm feel suits many guests, although lighter side sleepers may find it slightly too solid, even with the pillow top.