SleepSoul Heaven Gel Pocket 3000 King Size Mattress in a Box
The SleepSoul Heaven Gel Pocket 3000 is a mattress in a box, which means it arrives rolled and compressed for easier handling up stairs and through narrow doorways.
- Cool gel layer slows heat build-up
- Plush pillow top cushioning
- Zoned pocket & mini spring support
£388.48
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SleepSoul Heaven Gel Pocket 3000 Mattress in a Box
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Mattress details
Mattress
SleepSoul Heaven Gel Pocket 3000 Mattress in a Box
Size
Firmness
Medium Firm
Construction
Pocket Spring
Rolled
Gel
Depth (cm)
Layers
4
Layer Details
Pillow-top layer
A 2cm pillow-top layer of soft, plush filling. It adds a cushioned feel on the surface, so the mattress feels gentler than the medium-firm support underneath.
Coolgel layer
A 3cm Coolgel layer designed to slow down heat build-up in the mattress. This should help if you tend to warm up overnight, though how cool you feel will still vary from person to person.
Pocket springs
1000 pocket springs that move independently to follow your body's shape and support you where you need it. They also help prevent the 'roll-together effect', which matters if you share the bed.
Mini springs
A further 2000 mini pocket springs sit alongside the main springs for extra comfort and support. Together they make up the zoned support system, so different areas of your body get different levels of support.
Layer details from sleepsoul.co.uk and mattressonline.co.uk product pages, October 2026.
Key benefits
- More room each: At 75cm each for two sharing, the UK king gives you 7.5cm more than a UK double, which means a little more distance between you when one of you turns over.
- Length for taller sleepers: The UK king is 200cm long, 10cm longer than the UK double, which means a partner over six foot can stretch out without their feet hanging off the edge.
- Easier on split schedules: If one of you is up hours before the other, the wider surface gives the early riser more room to get out without climbing over the partner who is still asleep.
- Fits where a super king won't: We suggest at least 2.7m x 2.9m for a UK king, against 3m x 2.9m for the UK super king, so it suits bedrooms where a super king would leave you squeezing past.
- Size you can judge with confidence: SleepSoul doesn't publish full layer details for this mattress, so check the retailer's listing on construction, although the UK king dimensions themselves are standard.
This size suits you if...
You share the bed every night and a UK double has started to feel tight, one of you is tall enough to notice where the mattress ends, or your working hours mean one partner gets up while the other is still sleeping.
Consider another size if...
Your bedroom is smaller than 2.7m x 2.9m once wardrobes and bedside tables are in. We'd recommend the UK double instead, for which we suggest at least 2.6m x 2.8m.
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FAQ's
Is the SleepSoul Heaven Gel Pocket 3000 UK king long enough for someone over 6ft?
The UK king is 200cm long, or 6ft 6in, which is 10cm longer than a UK double. For a taller partner that extra length is often the more noticeable change, since it gives your feet somewhere to go at the bottom of the bed. If height is your only concern, the UK super king is the same length.
How much space do two people get on a UK king SleepSoul Heaven Gel Pocket 3000?
Each of you gets 75cm when sharing. That's 7.5cm more each than the UK double, which gives 67.5cm each, and 15cm less each than the UK super king at 90cm. For most couples moving up from a UK double, the UK king is enough to stop elbows meeting in the night.
Will a UK king mattress fit in a new build master bedroom?
Often, but measure first. We suggest at least 2.7m x 2.9m for a UK king, with 3.2m x 3.2m comfortable. New build master bedrooms can look generous when empty and lose a surprising amount of floor once fitted wardrobes go in, so measure the clear space you'll actually have left.
Should I get the SleepSoul Heaven Gel Pocket 3000 in UK king or UK super king?
Choose the UK king if your room is between 2.7m x 2.9m and 3m x 2.9m, since the UK super king needs more. If your room allows it and you want the most separation, the UK super king gives 90cm each, 15cm more per person. Both sizes are 200cm long, so length won't decide it.
Is a UK king big enough for two people and a dog?
It gives two people 75cm each, and a dog curled up on the bed takes its space from one of you. For an occasional visitor that's usually manageable. If the dog sleeps with you every night, the UK super king gives 90cm each; we suggest at least 3m x 2.9m for a UK super king.