Copper Fresh Envy 4000 Mattress
Mattress
Copper Fresh Envy 4000 Mattress
Size
Firmness
Medium
Construction
Foam
Pocket Spring
Hybrid
Memory Foam
Depth (cm)
20
Layers
6
Layer Details
- Knitted cover. A soft knitted finish that's breathable, which means air can move through the sleep surface rather than building up heat against your skin.
- 35mm Memory foam. This layer contours and cushions for pressure relief, so your hips and shoulders sink in slightly rather than pressing against a hard surface. The brand says it's backed by 12 years of R and D using AI and body pressure mapping.
- Pure copper layer. An entire layer of pure copper, which the brand states is 1000 times more conductive than wool, silk or polyester. In practice, that means heat is drawn away from your body, and copper is naturally antimicrobial too.
- Reflex foam. Sitting between the copper and the springs, this firmer foam helps achieve the medium feel. It stops you sinking too far into the comfort layers above.
- 1000 pocket spring unit. Each spring sits in its own fabric pocket and works independently, which means movement on one side of the bed is far less likely to travel across to yours.
- Recycled rebound foam base. A durable base with foam-encapsulated edge support, so the mattress holds its shape and you can sit or sleep near the edge without it giving way.
Layer details from mattressonline.co.uk product page, September 2026.
- Fits compact rooms: At 90cm wide, it leaves floor space free for a desk, wardrobe and toy storage in a child's room, and we suggest as little as 2.1m x 2.8m of floor space.
- Bunk and mid-sleeper friendly: At 20cm deep it sits within the depth limits most raised frames specify, so guard rails on bunks and cabin beds still do their job.
- Cooling for warm sleepers of any age: The pure copper layer draws heat away from the body, which teenagers who run warm at night will notice more than any spring count.
- Quiet in shared rooms: 1000 pocket springs move independently, so a restless child turning over in one bed is less likely to be heard across a shared bedroom.
- A medium feel that suits guests: For a spare room, medium is the sensible middle ground: firm enough for back sleepers, with 35mm of memory foam cushioning side sleepers' shoulders.
This size suits you if...
You're buying for a child or teenager and want a mattress with proper pocket springs rather than a basic foam slab, you need something for a spare room or study that occasionally hosts guests, or you sleep alone in a compact room, a student let or a loft conversion where only a 90cm footprint fits under the slope.
Consider another size if...
You're an adult sleeping in it every night and find 90cm of width restrictive, especially if you spread out. We'd recommend the UK small double instead: it's 30cm wider, the same length, and needs a room of at least 2.4m x 2.8m.
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Will the Copper Fresh Envy 4000 UK single fit a bunk bed?
In most cases, yes. The UK single is the standard bunk and mid-sleeper size at 90 x 190cm, and this mattress is 20cm deep, which sits comfortably within the depth limits most raised frames set so the guard rail stays effective. Check your frame's stated maximum mattress depth before ordering, as a few cabin beds specify less.
What room size do I need for a UK single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space, which gives you room to walk alongside the bed and open drawers or a wardrobe. That makes the UK single an easy fit in box rooms, loft conversions with a narrow usable strip, and children's rooms where the bed competes with a desk and toy storage.
Is the Copper Fresh Envy 4000 single a good mattress for a child or teenager?
It's a reasonable fit. The medium feel suits growing bodies without being too soft, and the copper layer helps teenagers who sleep hot. One caveat: it's single-sided, so it needs rotating every one to two months, which is a chore worth building into the routine. For very young children it may be more mattress than they need.
Should I buy the UK single or the UK small double?
It comes down to the sleeper and the room. The UK single is 30cm narrower than the UK small double, and the two are the same length. For a child, a shared siblings' room or a bunk frame, the UK single is the practical choice. A solo adult with space for at least 2.4m x 2.8m may prefer the UK small double.
Where is the cheapest place to buy the Copper Fresh Envy 4000 in a single?
Prices change often, so rather than naming a figure here, compare the retailers listed on this page. The prices shown are updated as retailers change them, which makes this table a more reliable guide than any single quote. Bear in mind the brand's trial requires a protector purchase, so factor that into the total cost.