Firmness
Medium Firm
Type
Hybrid
Depth (cm)
28
Number of Layers
6
Trial Period (nights)
100
Warranty (years)
5
Price Range
£310 to £815
Best Sleeping Position(s)
Certifications
Assessed from Horizon's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is pressure relief without the sinking feeling an all-foam mattress can give. The 6cm bamboo memory foam layer shapes around your shoulders and hips, while the pocket springs respond to movement independently, which means less disturbance when a partner turns over. A second layer of 2000 mini springs sits beneath, targeting pressure around your back, shoulders and neck. Memory foam does hold warmth, though the bamboo cover is a thoughtful touch. The 4cm foam encapsulated border keeps the edges supportive, useful if you sit on the bed to get dressed. At £310 for a Single, it undercuts many hybrids with a similar build.
Key Features & what's inside
- Quilted Memory Foam Cover. A quilted memory foam cover that you can remove, with dry cleaning recommended. Being able to take it off makes freshening the mattress easier than with a fixed cover.
- Bamboo Memory Foam. A 6cm layer of plush bamboo memory foam that shapes around your body for a cloud-like surface. This is the layer that cushions your shoulders and hips as you settle in.
- High Density Memory Foam. An extra layer of high density memory foam for durable comfort and reduced motion transfer. In practice, that means fewer wobbles reaching your side of the bed when a partner moves.
- Pocket Springs. 3000 pocket springs made from durable steel span the core, each responding to movement independently. This gives the mattress effective bounce back, so it feels responsive rather than sluggish.
- Mini Springs. 2000 mini springs sit within the build to target the more delicate parts of your body. They work to relieve built-up pressure around your back, shoulders and neck.
- Foam Border. A sturdy 4cm foam encapsulated perimeter secures the mattress and adds durability to the edge. You should be able to use the full width without feeling like you might roll off.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you sleep hot, the memory foam layers may hold more warmth than a traditional sprung mattress, even with the bamboo cover. Fans of a firm, no-give surface will likely find the medium feel too yielding. And at 28cm deep, you may need deeper fitted sheets than you currently own.
Horizon Juno 5000 Pocket Memory Mattress
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How firm is the Horizon Juno 5000 mattress?
Horizon describes it as medium, which means a balanced feel with some give at the surface. That suits most back and side sleepers. Lightweight sleepers should still find enough softness from the 6cm bamboo memory foam layer, while heavier stomach sleepers may prefer something firmer for spinal alignment.
How many springs does the Horizon Juno 5000 have?
It has 5000 springs in total: 3000 full-size pocket springs made from durable steel, plus 2000 mini springs. The pocket springs respond to movement independently, while the mini springs target pressure around your back, shoulders and neck.
Does the Horizon Juno 5000 come with a trial and guarantee?
Yes. Horizon offers a 100-night trial, which gives your body time to adjust before you commit, and a 5-year guarantee covering the mattress itself. A retailer listing also shows a 5 Year Guarantee, so the two align.
How deep is the Horizon Juno 5000 mattress?
It is 28cm deep, which is on the taller side. That depth accommodates the memory foam layers and the dual spring system, though you may need deep fitted sheets to get a proper fit.
What sizes is the Horizon Juno 5000 available in?
Five UK sizes: Single, Small Double, Double, King and Super King. Prices range from £310 to £815 depending on the size you choose, with delivery free to most locations and next day delivery available on weekdays.
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