Sleepeezee ActivFlex Response 1600 Memory Double Mattress
The Sleepeezee ActivFlex Response 1600 is a firm hybrid that pairs 1600 barrel-shaped pocket springs with memory-style foams, which means you get precise, targeted support with a gentle cushioned surface on top.
- Firm support with a softer top
- Cooling gel helps regulate temperature
- Hypoallergenic & vegan-friendly
£849
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Sleepeezee ActivFlex Response 1600 Memory Mattress
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Mattress details
Mattress
Sleepeezee ActivFlex Response 1600 Memory Mattress
Size
Firmness
Firm
Construction
Hybrid
Memory Foam
Depth (cm)
25
Layers
5
Layer Details
Soft Knitted Cover
A highly breathable knitted cover that's soft to the touch. It gives the mattress a genuinely luxurious finish.
Pillow Top / Comfort Layer
A soft polyester comfort layer that adds gentle cushioning, which means the surface feels welcoming rather than hard. It does this without compromising the firm feel underneath.
Staycool™ Gel
A deep layer of Staycool Gel that provides a consistently cooling sensation, helping to regulate your temperature. If you're a hot sleeper, this is the layer doing the work for you.
ActivFlex™ Spring Foam
A layer of spring foam that behaves like pocket springs for precise support, yet moulds to your body like foam. The result is support at every point of contact rather than pressure in a few places.
Pocket Springs Core
A core of up to 1600 barrel-shaped pocket springs delivering targeted support to key areas of your body. This is where the firm feel comes from.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- The classic couples' footprint: At 135 x 190cm (4ft 6in x 6ft 3in), the UK double fits comfortably in bedrooms where a UK king would crowd the walking space.
- Firm support helps in a shared bed: The pocket spring core keeps each half of the mattress stable, so with 67.5cm each you're less likely to roll towards your partner.
- Room for bedside tables: In a typical UK bedroom, the UK double usually leaves space for a table on each side, which a wider size often takes away.
- Cooling matters more when sharing: Two bodies raise the temperature under one duvet, so the Staycool Gel layer earns more of its value in this size than in a single.
- Works well as a guest bed: A UK double handles visiting couples and solo guests alike, and the gentle pillow top makes the firm feel more forgiving for people who aren't used to it.
This size suits you if...
You share the bed every night and want the traditional couples' size rather than something that swallows the room, or you sleep alone and like space to spread out, perhaps with a dog or cat claiming a corner. It also fits if you're furnishing a guest room that needs to sleep two comfortably. Allow at least 2.6m x 2.8m of floor space and it should sit well.
Consider another size if...
You and your partner both like room to stretch, or one of you is a restless sleeper. The UK double is 15cm narrower and 10cm shorter than the UK king, so we'd recommend the UK king instead if your room measures at least 2.7m x 2.9m.
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FAQ's
Is the Sleepeezee ActivFlex Response 1600 UK double big enough for a couple?
For most couples, yes. The UK double gives 67.5cm each for two people sharing, and the firm pocket spring core keeps each side stable rather than letting you roll together. That said, if either of you is tall or sleeps spread out, the extra width and length of the UK king is a meaningful upgrade.
What size room do I need for the Sleepeezee ActivFlex Response 1600 in a UK double?
We suggest a room of at least 2.6m x 2.8m for a UK double. That leaves enough space to walk round the bed and open drawers. In most UK bedrooms it also leaves room for bedside tables on both sides, which is one of the quiet advantages of choosing this size over a UK king.
How much bigger is the UK king than this UK double?
The UK double is 15cm narrower and 10cm shorter than the UK king. That extra length matters if either of you is tall, and the width buys noticeably more personal space. The trade-off is room: for the UK king we suggest at least 2.7m x 2.9m, against 2.6m x 2.8m for the UK double.
Is the UK double a good choice for a guest room?
It's the safest guest room size, since it sleeps visiting couples as well as solo guests. The firm feel of this mattress divides opinion less than you might expect, because the polyester pillow top softens the surface, and the Staycool Gel layer helps when two people share a bed in a small, warm room.
Does the firm feel of this mattress suit two people on a double?
Generally, yes. Firm support means less dip in the middle and less disturbance when one of you moves, which matters more at 67.5cm each than on a wider bed. The exception is lightweight side sleepers, who may find it presses on shoulders and hips regardless of size.