Luna 4000 Support Gel Memory Pocket Hybrid Double Mattress
The Luna 4000 Support Gel Memory Pocket Hybrid is a 25cm deep hybrid with a medium to firm feel, combining memory foam over a total of 4,000 springs, made up of 2,000 mini pocket springs sitting above a core of 2,000 full-size Luna Pocket springs.
- Support where your body needs it
- Minimises partner disturbance
- Contours without the heat build-up
£579
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Luna 4000 Support Gel Memory Pocket Hybrid Mattress
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Mattress details
Mattress
Luna 4000 Support Gel Memory Pocket Hybrid Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Gel
Depth (cm)
25
Layers
4
Layer Details
Luna Fusion Cool Memory Foam
A 2cm layer of memory foam that adapts around your body, which means gentle pressure relief where you need it. Its breathable, open cell structure lets air move through, giving a cooler, fresher feel than standard memory foam.
Reflex Foam
Two 3cm layers of Reflex foam add cushioning for extra comfort, which means a slightly softer landing before you reach the springs. They mould to your body and help keep your spine aligned.
Mini Pocket Springs
A layer of 2,000 mini springs gives a bouncy, comforting feel, so the mattress responds quickly when you change position. Their small size creates pockets of airflow and helps reduce motion transfer between partners.
Luna Pocket Springs
A core of 2,000 Luna Pocket springs, each encased in its own fabric pocket. They respond individually to changes in weight and movement, which means support is distributed exactly where your body needs it.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- The classic shared footprint: At 135 x 190cm, or 4ft 6in x 6ft 3in, the UK double is the long standing standard for two, which means it fits rooms a UK king would crowd.
- 67.5cm each for couples: Two people sharing get 67.5cm each, enough for most couples, and the individually pocketed springs mean your partner's fidgeting is less likely to travel across to your side.
- Room for tables both sides: Allow at least 2.6m x 2.8m and you should still fit bedside tables on both sides, which matters in a first flat or an older terrace bedroom.
- Easy, cheap to dress: Standard double sheets and a 200 x 200cm double duvet are stocked everywhere at every price, useful if you're furnishing a whole home at once.
- Generous for one: Sleeping solo, the full 135cm width leaves plenty of space to spread out, or to concede a corner to the dog without losing your own.
This size suits you if...
You share the bed every night and want the traditional couples' size in a room that meets our suggested 2.6m x 2.8m minimum, you're setting up a guest room that visiting couples will actually use, or you sleep alone and want space to stretch out with a medium firm, supportive feel.
Consider another size if...
You and your partner both like space and your room allows at least 2.7m x 2.9m. We'd recommend the UK king instead: it's 15cm wider and 10cm longer than the UK double.
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FAQ's
Is the Luna 4000 UK double wide enough for two adults?
For most couples, yes. You get 67.5cm each for two people sharing, and because each of the 2,000 Luna Pocket springs sits in its own fabric pocket, movement on one side is less likely to disturb the other. If you both sprawl, the UK king adds 15cm of width and 10cm of length.
Will the Luna 4000 UK double fit with bedside tables on both sides?
In most UK bedrooms, yes. We suggest a room of at least 2.6m x 2.8m for the UK double, which usually leaves walking space and room for a table each side. If your room is tighter than that, measure with the tables in place before ordering rather than after delivery.
Is the Luna 4000 in a UK double a good guest room mattress?
It's a sensible pick. The UK double accommodates visiting couples where a UK single can't, and the medium firm feel is the kind of middle-ground firmness that suits guests you can't tailor a mattress to. Across verified owner reviews it holds a 4.7 rating, from a small pool of 30.
Should couples size up from the double to the UK king with this mattress?
It depends on your room more than the mattress. The UK king is 15cm wider and 10cm longer than the UK double, and we suggest at least 2.7m x 2.9m for it. If your bedroom meets that comfortably, the extra width per person is usually worth having; if not, the UK double is the safer fit.
Where can I buy the Luna 4000 UK double?
Stock and pricing change often, so the most reliable answer is the live comparison table on this page, which is updated as retailers change their prices. Check the size name carefully at checkout: the UK double is 135 x 190cm, and it's easy to mix up with the 120cm wide UK small double.