Firmness
Type
Memory Foam
Depth (cm)
26
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£749 to £1,349
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is temperature control for people who like memory foam but hate the heat that often comes with it. A deep layer of Staycool gel actively draws warmth away from your body, so you get the moulding, cradled feel without waking up clammy. The ActivFlex spring foam sits between comfort and support layers, blending the give of foam with the push-back of springs for more precise pressure relief. Underneath, 2,600 pocket springs, including fast-reacting mini comfort springs, respond to movement independently, which means less disturbance from a restless partner. The medium tension suits most sleepers, although anyone who prefers a firm, planted feel may find the pillow top a little too plush.
Key Features & what's inside
- 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.
Who's it NOT for?
If you like a firm, supportive surface with minimal sink, the medium tension and plush pillow top here will probably feel too soft. It's also heavy going for anyone who needs a rolled, boxed delivery up narrow stairs, since it arrives flat. And note that pillow-top mattresses can't be flipped.
Sleepeezee ActivFlex Response 2600 Memory Mattress
Is the Sleepeezee ActivFlex Response 2600 good for hot sleepers?
It's designed with hot sleepers in mind. The Staycool gel layer actively draws heat away from your body rather than trapping it, and the knitted cover is highly breathable. If overheating has put you off memory foam before, this is one of the more sensible picks.
How firm is the Sleepeezee ActivFlex Response 2600?
It's rated medium, softened further by a plush polyester pillow top. That combination suits most back and side sleepers, although heavier stomach sleepers or anyone who prefers a distinctly firm feel may find it a little too forgiving.
How many springs does the ActivFlex Response 2600 have?
It has 2,600 springs in a King size: a combination of full-size, barrel-shaped pocket springs and fast-reacting mini comfort springs. Because each spring moves independently, movement on one side transfers less to the other.
Does the Sleepeezee ActivFlex Response 2600 come with a guarantee?
Yes, it comes with a Sleepeezee 10-year guarantee. MattressNextDay, the retailer listing it, offers free next day delivery to mainland UK, though some addresses may incur a small fee. It arrives flat, not rolled and boxed, so allow for that if access to your bedroom is tight.
What sizes does the Sleepeezee ActivFlex Response 2600 come in?
Five UK sizes: Single, Small Double, Double, King and Super King, priced from £749 up to £1,349. All sizes are 26cm deep, so most standard fitted sheets should cope, though it's deeper than a budget mattress and worth checking your bedding first.
Couldn't find an answer to your question? Send us a message