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.
- A full 6ft of width: At 6ft x 6ft 6in, the UK super king gives each of you 90cm, which means a partner who turns over repeatedly is simply further away from you.
- More room than the UK king: You get 30cm more width than the UK king at the same length, which works out as 15cm more each when two of you share.
- Cooling for a crowded bed: A cool-touch cover and gel-infused memory foam are designed to draw heat away, which helps when an extra small body or a dog adds warmth.
- Firm support across the whole surface: Firm pocket springs compress individually, so a child or pet lying in the middle is supported where they lie rather than dragging your side towards them.
- Suits a big period bedroom: In a large master bedroom with high ceilings, a UK super king looks proportionate where a smaller bed can appear a little lost.
This size suits you if...
You share with a partner whose tossing and turning wakes you, your children regularly climb in during the night or a large dog sleeps on the bed as a matter of routine, and you prefer a firm surface with a cooler feel than standard memory foam.
Consider another size if...
Your bedroom falls short of our suggested 3m x 2.9m minimum. We'd recommend the UK king instead, which needs 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.
Is the SleepSoul Cooler Ortho 4000 UK super king big enough for two adults and a child?
With 180cm of width, two adults get 90cm each before a child arrives, so a small visitor in the middle is less likely to push anyone to the edge. The firm pocket springs compress individually, which means a child's weight is taken where they lie rather than tipping the surface towards them.
How much bigger is the Cooler Ortho 4000 in a UK super king than a UK king?
The UK super king is 30cm wider than the UK king, and both are the same length. For two people sharing, that works out as 15cm more each, rising from 75cm on the UK king to 90cm on the UK super king. The feel and construction are identical across both sizes.
Will a firm super king help if my partner is a restless sleeper?
Distance does more than any comfort layer here. At 90cm each on the UK super king, a partner who fidgets is physically further from you. The independently moving pocket springs also mean their movement is less likely to travel across to your side, although no mattress removes it entirely.
Can I fit a UK super king Cooler Ortho 4000 in a loft conversion bedroom?
Allow at least 3m x 2.9m, with around 3.5m x 3.2m feeling more comfortable. In a loft conversion the sloping ceiling usually decides which wall the bed goes against, so check you have standing headroom at the side where you get in and out of a 180cm-wide bed.
Is the Cooler Ortho 4000 super king good for sleeping with a large dog?
The 180cm width gives a large dog room to settle without taking a sleeper's space entirely. Because the surface is firm and the springs work independently, the dog's weight stays where it lies. The cooling cover and gel foam may also help offset the extra heat a dog brings.