Harrison Spinks Quilted Fusion 4000 Pocket Mattress
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Mattress
Harrison Spinks Quilted Fusion 4000 Pocket Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Eco-Friendly
Depth (cm)
25
Layers
5
Layer Details
Quilted panel sleep surface
A quilted panel with tufting hidden on the inside of the soft fabric cover, which means a smooth sleep surface without the knots or bumps you sometimes feel through traditionally tufted mattresses.
Enviropad filling
Three thick, fluffy layers of Enviropad filling relieve pressure build-up around your hips and shoulders. It's also fully recyclable, so the comfort layer doesn't end up in landfill.
Cortec™ Quad pocket spring core
The main Cortec Quad core places each spring in its own fabric pocket, secured together without glue. That means each spring moves independently, giving personalised support where your body needs it.
Posturfil mini pocket springs
1000 Posturfil mini pocket springs add a bouncy, comforting feel on top of the core. They also improve airflow through the mattress, which helps if you tend to sleep warm.
HD mini pocket springs
A further 2500 HD mini pocket springs provide additional bouncy comfort. This second mini spring layer is a large part of why the firm feel doesn't come across as harsh.
Layer details from mattressonline.co.uk product page, September 2026.
- Fits almost any room: At 90cm wide it slots into box rooms, lofts with sloped ceilings and spare rooms doubling as offices; we suggest at least 2.1m x 2.8m of floor space.
- Full spring count, small footprint: You get the complete Cortec Quad core plus 1000 Posturfil and 2500 HD mini pocket springs even at this width, so support isn't diluted in the smaller size.
- Firm support that grows with a teenager: The firm feel suits older children and teens gaining weight and height, though very light young children may find it a little too solid at first.
- Works on raised frames: The standard 90 x 190cm footprint fits bunk, cabin and mid-sleeper frames; just check its 25cm depth leaves enough guard rail above the surface on a top bunk.
- Sensible for guest rooms: A firm, springy single is a safe bet for a spare room, since the responsive feel copes with a range of guest weights without the harshness some firm beds have.
This size suits you if...
You're buying for a teenager or older child who needs proper firm support in a compact room, you're a single adult who prefers a solid feel and doesn't need extra width, or you're kitting out a guest room or study that doubles as sleeping space. It also suits student rooms and first flats where the frame is provided and only a standard 90 x 190cm mattress is needed.
Consider another size if...
You share the bed, or you sleep alone but sprawl and keep waking at the edge. The UK double gives you 45cm more width at the same length; allow at least 2.6m x 2.8m of floor space for it.
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Is the Quilted Fusion 4000 UK single a good choice for a child's bed?
For older children and teens, yes: the firm 4000-spring build gives growing backs consistent support, and the 90 x 190cm footprint leaves room for a desk and wardrobe in a typical child's bedroom. Very light young children may find the firm feel too solid, as their shoulders and hips won't sink in much. It's also hypoallergenic and chemical treatment-free.
Will the UK single Quilted Fusion 4000 fit a bunk or mid sleeper frame?
The footprint is the standard UK single, 90 x 190cm, so it fits standard bunk, cabin and mid-sleeper frames. The one thing to check is depth: at 25cm it's thicker than many bunk mattresses, so make sure the guard rail on a top bunk still sits high enough above the sleep surface. Check your frame's maximum mattress depth first.
What room size do I need for a single Quilted Fusion 4000?
We suggest allowing at least 2.1m x 2.8m of floor space, which is our own guidance rather than the manufacturer's. That leaves enough room to walk alongside the bed and open drawers or a wardrobe. In practice this size fits box rooms, loft conversions where only a narrow footprint works under the slope, and spare rooms that also hold a desk.
Is a UK single big enough for an adult?
For one adult who sleeps fairly still, yes. You get 90cm of width and 190cm of length, the standard UK one-person size, and the firm springy feel means you won't roll towards a dip in the middle. If you're tall, broad or tend to sprawl, the same mattress in a UK double gives you noticeably more room at the same length.
How much smaller is the single than the double in this mattress?
The UK single is 45cm narrower than the UK double, and the two are the same length. The construction is identical in both, so you're choosing on space alone. If the bedroom allows at least 2.6m x 2.8m, the UK double is the more comfortable long-term buy for an adult; for a child's room or guest space, the UK single usually makes more sense.