Firmness
Medium Firm
Type
Hybrid
Depth (cm)
25
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
10
Price Range
£345 to £689
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Choose this one if you want a supportive hybrid at a sensible price. The 2500 individually pocketed springs adapt to your body and movement, which means less partner disturbance and support that follows your shape rather than pushing back as one unit. The Fusion Cool memory foam has an open cell structure, so it breathes better than traditional memory foam, a genuine plus if you tend to sleep warm. Reflex foam beneath reinforces the medium to firm feel and helps keep your spine aligned. It conforms to BS7177: 2008 fire safety standards for home use. The firmer feel takes some getting used to, but for most back sleepers that structure is exactly the point.
Key Features & what's inside
- Knitted cover. A soft knitted cover that adds a touch of cosiness and warmth. Knitted covers also enhance airflow, so the surface stays breathable.
- Luna Fusion Cool Memory Foam. A 4cm layer of memory foam with an open cell structure, which means it breathes better and feels cooler than standard memory foam. You get the contouring without as much of the heat.
- Reflex Foam. Reflex foam in 2cm and 3cm layers adds cushioning and reinforces the medium to firm feel. It moulds to your body while promoting spinal alignment.
- Luna Pocket Springs. A core of 2500 Luna pocket springs, each encased in its own cloth pocket. They respond individually to movement, which means personalised support and less disturbance when a partner shifts.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you're a lightweight side sleeper or simply prefer a soft, sink-in feel, the medium to firm support here will likely feel too solid. Owner feedback suggests the firmness can take a short adjustment period, so this isn't the mattress for anyone wanting instant plushness from night one.
Luna Memory 2500 Pocket Hybrid Mattress
Across 332 reviews on the Mattress Online product page, this mattress holds a 4.6 rating, with owners reporting comfortable, deep sleep and reduced aches. The recurring caveat is a firmer feel that can take a short adjustment period, though reviewers praise the material quality for the price and the lack of any initial odour.
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How firm is the Luna Memory 2500 mattress?
It has a medium to firm feel, reinforced by reflex foam layers beneath the memory foam. That suits back and stomach sleepers well, although lightweight side sleepers may find it a little too firm. Some owners note a short adjustment period before it feels fully comfortable.
Does the Luna Memory 2500 sleep hot?
It's designed not to. The Luna Fusion Cool memory foam has an open cell structure that breathes better than standard memory foam, and the knitted cover enhances airflow. If you're a hot sleeper, this is a more sensible pick than a traditional all-foam mattress.
Does the Luna Memory 2500 come with a trial and guarantee?
Mattress Online, the retailer listing this mattress, offers a 100-night trial and states a 10-year guarantee. These are the retailer's own terms rather than a manufacturer promise, so check the conditions before you buy if purchasing elsewhere.
How deep is the Luna Memory 2500 mattress?
It's 25cm deep, combining a 4cm layer of cooling memory foam, reflex foam layers of 2cm and 3cm, and a core of 2500 pocket springs. Standard fitted sheets should work fine at this depth.
What sizes is the Luna Memory 2500 available in?
Five UK sizes: Single, Small Double, Double, King and Super King, with prices ranging from £345 to £689 depending on size.
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