Sleepeezee Cosmic 3000 Combination Double Mattress
The Sleepeezee Cosmic 3000 Combination Mattress pairs graphite-infused memory foam with micro and pocket springs under a plush pillow top, which means a soft-feeling surface that works to keep heat away.
- Cooler sleep with graphite foam
- Plush pillow top cushioning
- Supportive edges, no roll-off feeling
£1,299
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Sleepeezee Cosmic 3000 Combination Mattress
More available sizes
Mattress details
Mattress
Sleepeezee Cosmic 3000 Combination Mattress
Size
Firmness
Construction
Memory Foam
Pocket Spring
Depth (cm)
33
Layers
3
Layer Details
Plush pillow top
A pillow top finished with reinforced edges. It adds cushioning to the surface, and the reinforced edges help the sides feel steadier.
Graphite-infused memory foam
A memory foam infused with graphite, which draws away heat and moisture. That should help you stay cooler through the night.
Micro and pocket springs
Layers of micro and pocket springs, with 3,000 springs in total, though Sleepeezee doesn't give a size. They provide tailored support and cooling comfort underneath the foam.
Layer details from dreams.co.uk product page, November 2026.
Key benefits
- Fits a typical shared bedroom: At 4ft 6in x 6ft 3in, it suits rooms of at least 2.6m x 2.8m by our guidance, while around 3m x 3m gives you comfortable space to walk round.
- Edges you can sleep near: With 67.5cm each, lying close to the side is normal on a UK double, and the reinforced pillow top edges are designed to make that strip feel steadier.
- Cooler when sharing: Two people in a UK double produce plenty of heat, which is where the graphite-infused memory foam and breathable knit cover, both meant to draw warmth away, should help.
- Bedding is easy to find: Double sheets and duvets are on sale almost everywhere, so dressing this mattress won't send you hunting for unusual sizes.
- Check your frame first: At 33cm deep, the UK double sits fairly high, so make sure your existing double bed frame and headboard still look and work right with that depth.
This size suits you if...
You share the bed most nights and like a cushioned surface, your bedroom is around 3m x 3m and you want bedside tables on both sides, or you're kitting out a guest room where visiting couples will stay.
Consider another size if...
You're both broad or restless sleepers and 67.5cm each feels tight. We'd recommend the UK king instead: the UK double gives 7.5cm less each, and we suggest at least 2.7m x 2.9m for the UK king.
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FAQ's
Is the Sleepeezee Cosmic 3000 UK double big enough for two people?
For most couples, yes. You get 67.5cm each, and the reinforced edges mean you can use the full width rather than drifting to the middle. If either of you is tall, bear in mind the UK double is 10cm shorter than the UK king, which some taller sleepers notice.
What room size do I need for a Sleepeezee Cosmic 3000 double?
We suggest at least 2.6m x 2.8m. Around 3m x 3m is more comfortable if you also want a wardrobe, drawers and a bedside table on each side. In a smaller second bedroom, measure where the doors open as well as the floor space.
Sleepeezee Cosmic 3000 UK double or UK king: which should I choose?
The UK double is 15cm narrower and 10cm shorter than the UK king, so it leaves more floor around it. Choose the UK king if you've got the space, as we suggest at least 2.7m x 2.9m for it. Measure the room, then compare the retailers listed on this page.
Is the Cosmic 3000 UK double too big for one person with a pet?
Not if your dog or cat likes to stretch out. The UK double is 15cm wider than the UK small double, which gives a pet a corner without pushing you to the edge. If your room is tight, the UK small double needs at least 2.4m x 2.8m by our guidance.
What duvet size fits a Sleepeezee Cosmic 3000 UK double?
A standard double duvet, 200 x 200cm, and double sheets fit. The mattress is 33cm deep, so check the pocket depth on any fitted sheet before buying, as shallower sheets can struggle to stay on.