Luna 4000 Support Gel Memory Pocket Hybrid 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
£339
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The Luna 4000 is good value for a double-spring hybrid, and it comes in five UK sizes from Single to Super King. Across verified owner reviews on mattressonline.co.uk it holds a 4.7 rating, from a small pool of 30 reviews. If you like a supportive feel with a little bounce rather than deep sink, this is a sensible shortlist candidate.
Mattress specifications
Firmness
Medium Firm
Type
Hybrid
Depth (cm)
25
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
10
Price Range
£339 to £669
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The main draw is the two-tier spring system. The 2,000 mini springs near the surface give a responsive, cushioned feel and help air move through the mattress, while the 2,000 Luna Pocket springs beneath respond individually to weight and movement, which means support goes where your body actually needs it and your partner's fidgeting is less likely to wake you. Above the springs, a layer of Luna Fusion Cool Memory Foam with an open cell structure adapts around you while running cooler than standard memory foam, so hot sleepers get contouring without the usual heat build-up. Mattress Online lists a 100-night trial and a 10-year guarantee, though those are the retailer's own terms rather than the brand's.
Key features & 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.
Best suited for?
Couples
Individually pocketed Luna springs respond to weight and movement separately, so your partner's fidgeting is less likely to wake you during the night.
Warm sleepers
Open cell Luna Fusion Cool Memory Foam and a layer of mini springs let air move through, giving contouring without the usual heat build-up.
Back sleepers
A medium firm feel with 2,000 pocket springs in the core gives a supportive base with a little bounce rather than deep sink.
Combination sleepers
Mini springs make the surface respond quickly when you change position, so turning over feels easy rather than like climbing out of a hollow.
Budget buyers
Described as good value for a double-spring hybrid, it offers two spring layers and a memory foam top across five UK sizes.
If you prefer a soft, sink-in feel, this is unlikely to suit: owners describe it as firm, sometimes firmer than expected at first. It's also not the choice if you want an all-foam mattress with no bounce, as the two spring layers give it a noticeably responsive feel.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Luna 4000 Support Gel Memory Pocket Hybrid Mattress
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FAQ's
Is the Luna 4000 mattress firm or soft?
It's described as medium to firm. Across owner reviews it comes up as firm, sometimes a little firmer than expected out of the box, though several owners say it softens after a period of use. Lightweight side sleepers may find it slightly too firm for comfortable pressure relief.
Does the Luna 4000 really have 4000 springs?
Yes, but split across two layers: 2,000 mini pocket springs near the surface and a core of 2,000 full-size Luna Pocket springs. The retailer's specification lists the total pocket spring count as 4,000, which includes both layers rather than 4,000 main springs.
Does the Luna 4000 mattress sleep hot?
It's better equipped than many memory foam hybrids. The Luna Fusion Cool Memory Foam has an open cell structure for airflow, and the mini spring layer creates pockets of air within the mattress. Owner reviews mention good temperature regulation, so hot sleepers should find it a reasonable pick.
Does the Luna 4000 come with a trial and guarantee?
Mattress Online lists a 100-night trial and a 10-year guarantee. These are that retailer's own terms rather than the manufacturer's, so if you buy elsewhere, check what that seller offers before ordering.
How deep is the Luna 4000 mattress?
It's 25cm deep, which suits most standard fitted sheets. That depth covers the memory foam and Reflex foam comfort layers plus the two spring layers, and it's available in UK Single, Small Double, Double, King and Super King sizes.
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