Sleepeezee ActivFlex Response 2600 Memory Double 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
£949
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Sleepeezee ActivFlex Response 2600 Memory Mattress
More available sizes
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
- The classic shared size: At 4ft 6in x 6ft 3in, the UK double is the long-standing standard for couples, and this mattress's independent pocket springs help two sleepers share it without disturbing each other.
- Fits rooms a king can't: We suggest at least 2.6m x 2.8m, which most UK doubles bedrooms clear, often with room for bedside tables on both sides.
- Cooling for two: Sharing a bed adds body heat, so the Staycool gel layer matters more in a double than it would for a solo sleeper.
- Motion isolation at close quarters: With 67.5cm each, you'll feel a restless partner sooner than on a UK king, but the fast-reacting mini springs keep movement from travelling across the mattress.
- Easy to dress: Standard double sheets and a 200 x 200cm duvet fit, stocked everywhere at every price, which helps if you're furnishing a whole home at once.
This size suits you if...
You and a partner share the bed every night in a typical UK bedroom, and you want a plush, cooler-sleeping surface without giving the room over entirely to the bed. It also suits a solo sleeper who likes space to spread out, or a guest room that regularly hosts visiting couples and needs to feel genuinely comfortable rather than merely adequate.
Consider another size if...
You're both tall or you each want more than 67.5cm of width. The Sleepeezee ActivFlex Response 2600 in a UK king is 15cm wider and 10cm longer, and we suggest at least 2.7m x 2.9m of room for it.
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FAQ's
Is the UK double Sleepeezee ActivFlex Response 2600 big enough for a couple?
Yes, with a caveat. At 135 x 190cm you each get 67.5cm of width, which suits most couples, and the independent pocket springs reduce disturbance when one of you moves. If either of you is tall or a restless sprawler, the extra 15cm of width and 10cm of length on the UK king is a meaningful upgrade.
What room size do I need for the ActivFlex Response 2600 in a UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves walking space on both sides and, in most rooms, enough wall for a wardrobe and drawers. If your bedroom sits under that, the UK small double is 15cm narrower and we'd suggest at least 2.4m x 2.8m for it.
Should I choose the ActivFlex Response 2600 in a UK double or a UK king?
The UK double is 15cm narrower and 10cm shorter than the UK king. Choose the UK double if your room is close to our suggested 2.6m x 2.8m minimum or you want space for other furniture. Choose the UK king if you're tall or you both want more sleeping width, and your room clears 2.7m x 2.9m.
Will the UK double ActivFlex Response 2600 fit up narrow stairs?
It arrives flat rather than rolled, so a 135 x 190cm mattress at 26cm deep has to make every turn on your staircase in one piece. In older terraces with tight winders, or new builds with narrow landings, measure the awkward corner before ordering. If access is genuinely tight, a rolled mattress may be the safer choice.
Is a UK double ActivFlex Response 2600 a good guest room choice?
It's a sensible one. A UK double hosts visiting couples where a UK single can't, and the medium tension is a safe middle ground when you don't know your guests' preferences. The plush pillow top may feel soft to firm-mattress fans, but for occasional use that's a minor quibble rather than a dealbreaker.