Horizon Juno 5000 Pocket Memory Mattress
Mattress
Horizon Juno 5000 Pocket Memory Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
28
Layers
6
Layer Details
- 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.
- Genuine solo stretching room: At 30cm wider than the UK single, this size lets you starfish, shift position and still stay on the memory foam rather than the edge.
- Fits rooms a double cannot: Being 15cm narrower than the UK double, it can be the difference between a door that clears the bed frame and one that doesn't.
- Edges you can actually use: The 4cm foam encapsulated border keeps the perimeter supportive, which matters more at 120cm wide where every centimetre of usable surface counts.
- Copes with occasional sharing: The pocket springs respond independently, so a guest room couple sharing for a weekend won't feel every turn the other makes.
- Standard 4ft bedding: The small double is a standard UK size, so fitted sheets and frames are easy to find, though the 28cm depth may need deep-pocket sheets.
This size suits you if...
You're a solo adult who has outgrown a single and wants space to spread out without giving the room over to the bed, your bedroom or box room is too tight for a 135cm frame, or you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly.
Consider another size if...
You share the bed every night, since 120cm gets cramped for two adults long term. We'd recommend the UK double instead, which is 15cm wider and the same length; allow at least 2.6m x 2.8m for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is a small double Horizon Juno 5000 big enough for a couple?
For occasional nights, yes. The pocket springs limit motion transfer and the foam border keeps the edges usable, so two guests can share comfortably for a weekend. As an every-night bed for two adults, 120cm of width is tight, and the UK double or UK king of this mattress would serve you better.
What room size do I need for the Horizon Juno 5000 small double?
We suggest at least 2.4m x 2.8m. That leaves enough clearance to walk round the bed and open the door, which is exactly why this size gets chosen for box rooms, studio flats and loft conversions where a UK double would leave no standing room on one side.
How much bigger is the small double than the single in this mattress?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the difference between sleeping in one fixed position and having room to turn and spread out, which is why it suits teenagers and adults who have outgrown a single.
What bedding fits the Horizon Juno 5000 in a small double?
Small double (4ft) fitted sheets, which are widely stocked because it's a standard UK size. One caveat: this mattress is 28cm deep, so check the pocket depth on your sheets before buying, as standard ones may not tuck under fully. A standard double duvet works fine on top.
Where can I buy the Horizon Juno 5000 in a small double?
Compare the retailers listed on this page; the prices shown here are updated as retailers change them, so what you see reflects current availability rather than a snapshot. Availability of the UK small double can differ from the other four sizes, so it's worth checking back if your preferred retailer isn't showing it.