Harrison Spinks Quilted Fusion 4000 Pocket Mattress
Mattress
Harrison Spinks Quilted Fusion 4000 Pocket Mattress
Size
Firmness
Firm
Construction
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.
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Layer details from mattressonline.co.uk product page, September 2026.
- Space that solves restlessness: With 90cm each for two people sharing, distance does what no comfort layer can: your partner's turning simply happens further away.
- Independent springs across a wide bed: The Cortec Quad core places each spring in its own glue-free pocket, so movement on one side barely registers on the other.
- Room for the whole household: At 6ft x 6ft 6in there's still a fair share for everyone when children or a large dog find their way in overnight.
- Firm without feeling harsh: The mini pocket spring layers add a slightly bouncy surface, which means firm support that doesn't come across as board-like at any size.
- Cooler across a bigger surface: The Posturfil mini springs improve airflow through the mattress, useful when two warm bodies share one bed all night.
This size suits you if...
You share the bed every night and want the maximum mainstream size, your partner is restless and you'd rather sleep out of range of every turn, or children and pets regularly join you and a UK king has started to feel crowded. Your bedroom should measure at least 3m x 2.9m, our suggested minimum for this size.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest for the UK super king, or you sleep alone. We'd recommend the UK king instead, which is 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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What size room do I need for the Quilted Fusion 4000 super king?
We suggest at least 3m x 2.9m for a UK super king, and that's our guidance rather than the brand's. Measure the door swing and any landing turns too: at 180 x 200cm this is a large item to move upstairs, so check the route before you order.
How much space does each person get on a super king?
Two people sharing get 90cm each. That's enough that a partner who shifts position through the night is genuinely easier to ignore, and the Quilted Fusion's glue-free pocket springs help further by moving independently, so their side settles without disturbing yours.
Is the super king Quilted Fusion 4000 worth it over the UK king?
The UK super king is 30cm wider than the UK king and the same length. If children or pets join you regularly, or one of you is a restless sleeper, that extra width is the difference between crowded and comfortable. If you sleep undisturbed as a couple already, the UK king may be plenty.
Is the Quilted Fusion 4000 super king hard to rotate?
It's single-sided, so you never flip it, but you should rotate it every 6 months to keep wear even. At 180 x 200cm that's realistically a two-person job, so plan to do it together when you change the sheets.
What bedding fits a Quilted Fusion 4000 super king?
You'll need super king sheets and we'd suggest a 260 x 220cm duvet. Fitted sheets should suit a 25cm depth, which this mattress is. Super king bedding costs more than smaller sizes, so factor that in alongside the mattress itself.