Sleepeezee ActivFlex Response 2600 Memory Super King Mattress
The Sleepeezee ActivFlex Response 2600 is a medium-tension memory mattress that pairs 2,600 pocket springs with cooling gel and a pillow top, which means you get the contouring of foam without losing the responsive support of springs.
- Cooling gel draws heat away
- Minimises partner disturbance
- Medium feel suits most sleepers
£1,349
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Sleepeezee ActivFlex Response 2600 Memory Mattress
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Mattress details
Mattress
Sleepeezee ActivFlex Response 2600 Memory Mattress
Size
Firmness
Medium
Construction
Memory Foam
Depth (cm)
26
Layers
5
Layer Details
Soft Knitted Cover
A breathable knitted cover finishes the mattress with a genuinely soft, luxurious surface feel. It also helps air move through the top of the mattress.
Pillow Top
A sumptuous pillow top of soft polyester adds full-body cushioning before you reach the working layers below. This is where the plush, sink-in first impression comes from.
Staycool™ Gel
A deep layer of Staycool gel actively draws heat away from your body, which means the cooling works with you all night rather than fading after an hour. It also moulds to your curves for pressure relief from head to toe.
ActivFlex™ Spring Foam
This engineered foam combines the benefits of springs and foam, targeting tension relief while moulding to your body shape. In practice, it gives you contouring without the stuck-in-the-mattress feel some memory foams have.
Pocket Springs
The core combines full-size, barrel-shaped pocket springs with fast-reacting mini comfort springs. Each spring moves independently, so your partner's tossing and turning is far less likely to reach your side.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- 90cm each for two sharing: You each get 90cm of width, which means a fidgety partner can turn over all night without crossing into your space.
- Springs plus distance: The 2,600 pocket springs move independently, and at this width their motion isolation barely gets tested, because movement rarely reaches your side anyway.
- Room for night-time visitors: When a child pads in at 3am, or the dog treats the bed as routine, a super king absorbs the extra body without anyone giving up sleep.
- Fills a large master properly: In a period property or a big new build master, a UK king can look lost against the wall; this size sits in proportion.
- Cooling that suits shared beds: Two bodies generate more heat than one, so the Staycool gel layer matters more here than in any smaller size.
This size suits you if...
You share the bed every night and want a genuinely restless partner to become someone else's problem, or your household includes children or pets who join you more often than not. It also suits you if your bedroom comfortably clears our suggested 3m x 2.9m minimum, ideally closer to 3.5m x 3.2m, so the bed feels generous rather than crammed.
Consider another size if...
Your room falls short of 3m x 2.9m, or you'd struggle to get a large flat-delivered mattress up your stairs. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
How big is the Sleepeezee ActivFlex Response 2600 in a super king?
It measures 180 x 200cm, which is 6ft x 6ft 6in, with the same 26cm depth as every other size. That's 45cm wider than the UK double and 30cm wider than the UK king, so check your bed frame is a true super king before ordering.
Can I get the ActivFlex Response 2600 super king up my stairs?
This is the one check we'd urge before buying. The mattress arrives flat rather than rolled, and at 180 x 200cm it's an awkward carry. Measure your stairwell, any landing turns and the bedroom door swing first. If access is tight, a zip and link arrangement or a smaller size may be the safer route.
Is the super king worth it over the UK king for a restless partner?
Usually, yes. The UK super king is 30cm wider than the UK king, and both are the same length. The pocket springs already stop movement travelling across the mattress, but extra distance is the most reliable fix of all. You'll need a room of at least 3m x 2.9m rather than 2.7m x 2.9m.
Does this size work for families sharing with children or pets?
It's the best-suited size in the range for it. With 90cm each for two people sharing, there's slack for a child who wanders in overnight, and the independent springs mean their wriggling stays local. The plush pillow top is forgiving for small visitors too, though remember it can't be flipped.
Where can I buy the ActivFlex Response 2600 in a super king?
Availability shifts, so the most reliable answer is the live comparison table on this page, where prices are updated as retailers change them. If the super king isn't showing, it may be temporarily out of stock, and checking back is quicker than trawling individual retailer sites.