SleepSoul Cooler Ortho 4000 Series Pocket Gel Mattress
Mattress
SleepSoul Cooler Ortho 4000 Series Pocket Gel Mattress
Size
Firmness
Firm
Construction
Depth (cm)
26
Layers
3
Layer Details
- Cooler™ Fabric Cover. A cool-feel knitted fabric cover that gives an instant cooling effect the moment you lie down. It also enhances breathability, helping air move through the mattress.
- Cool Gel Memory Foam. Thick layers of memory foam infused with gel microbeads, which actively draw heat away from your body. That means the contouring comfort of memory foam without the warm, sticky feel it can sometimes have.
- Pocket Springs. Firm pocket springs, each sitting in its own fabric pocket so they compress independently. This gives targeted support and pressure relief where your body needs it, rather than a uniform push-back.
Layer details from mattressnextday.co.uk product page, September 2026.
- Room to spread out: At 75cm each for two sharing, you get 7.5cm more personal space than on a UK double, which means fewer knocked elbows and less creeping towards the edge.
- Extra length for taller sleepers: The UK king is 200cm long, 10cm longer than a UK double, so a partner approaching 6ft can stretch out without their feet ending up at the edge.
- Fewer disturbances from early starts: Firm pocket springs compress independently, so when one of you gets up hours before the other, the movement stays largely on their side rather than spreading across the bed.
- Cooler with two in the bed: Two bodies build up more warmth than one, and the gel-infused memory foam beneath a cool-feel cover is designed to draw that heat away through the night.
- More space without super king demands: We suggest at least 2.7m x 2.9m for the UK king against 3m x 2.9m for the UK super king, a difference that matters in a new build bedroom with fitted wardrobes.
This size suits you if...
You share the bed every night and keep bumping into each other on a UK double, one of you is tall enough that the extra length makes a real difference, or you keep different hours and want a firm, supportive surface that keeps movement on one side.
Consider another size if...
Your bedroom is smaller than our suggested 2.7m x 2.9m, or you sleep alone. We'd recommend the UK double instead, for which we suggest at least 2.6m x 2.8m.
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Is the SleepSoul Cooler Ortho 4000 UK king big enough for two adults?
For most couples, yes. The UK king gives 75cm each for two sharing, which is 7.5cm more each than the UK double. If you both sleep spread out, the UK super king gives 90cm each, although it needs a larger room: we suggest at least 3m x 2.9m, compared with 2.7m x 2.9m for the UK king.
Will I feel my partner moving on the SleepSoul Cooler Ortho 4000 in a UK king?
Less than on a smaller size. The pocket springs each sit in their own fabric pocket and compress independently, and the UK king's 150cm width puts a little more distance between you than a UK double does. You may still notice someone climbing in or out, but ordinary shifting in the night should stay mostly on their side.
Is the SleepSoul Cooler Ortho 4000 king size long enough for tall sleepers?
It is 200cm long, or 6ft 6in, which is 10cm longer than a UK double. That extra length is often the real reason couples upgrade when one partner is approaching 6ft. The UK super king is the same length, so sizing up beyond the UK king adds width only, with no extra legroom.
Should we get the SleepSoul Cooler Ortho 4000 in a UK king or UK super king?
Choose the UK king if your room is tight: we suggest at least 2.7m x 2.9m. The UK super king is 30cm wider and gives 15cm more each, but we suggest at least 3m x 2.9m for it. The two sizes are the same length, so your decision comes down to width and floor space.
Is the SleepSoul Cooler Ortho 4000 king size big enough with a dog on the bed?
The UK king's 75cm each assumes two people only. If a dog joins you most nights, it will take a share of that, usually from whoever it curls up beside. If your room allows at least 3m x 2.9m, the UK super king gives 90cm each and leaves more space for everyone.