Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Double Mattress
The Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Mattress combines two Staycool Gel foam layers with three tiers of pocket springs, which means a soft, cushioned surface that stays cool with support underneath.
- Cushioned pillow top comfort
- Gel layers keep you cooler
- 10-year guarantee
£1,199
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Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Mattress
More available sizes
Mattress details
Mattress
Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Mattress
Size
Firmness
Medium Soft
Construction
Foam
Gel
Pocket Spring
Depth (cm)
33
Layers
9
Layer Details
Soft knitted cover
The knitted pillow top cover that you sleep on. It gives the mattress a soft, quilted-feel finish.
Soft polyester comfort layer
A soft polyester fibre layer under the cover. It adds surface cushioning, so the mattress feels gentle as you lie down.
Staycool Gel
Two dedicated layers of Staycool Gel foam, which Sleepeezee describes as pressure-sensitive and cooling. They ease pressure and help the surface stay cooler.
ActivFlex spring foam
A profiled foam that combines the adaptive benefits of foam with the responsiveness of springs. You get contouring without feeling stuck in the mattress.
1000 mini comfort springs
A top layer of mini pocket springs nestled within the pillow top. They add a responsive, close-fitting layer of comfort near the surface.
1400 mini comfort springs
A middle layer of mini pocket springs that adds responsiveness. It helps the mattress react as you move.
1200 traditional pocketed springs
The core layer of main pocket springs that provides the foundation and support. This is what holds your weight steady beneath the softer layers.
Fully encapsulated spring unit
A high-density foam border surrounds the spring unit to give edge-to-edge support. It makes the sides firmer to sit on and gives you more usable sleeping space.
Foundation support pad
A support pad that forms the foundation for the layers above. It sits at the base and supports the springs.
Layer details from sleepeezee.com product page, October 2026.
Key benefits
- Leaves space for the rest of the room: At 4ft 6in x 6ft 3in, it still leaves floor for a wardrobe and drawers, and we suggest a bedroom of at least 2.6m x 2.8m.
- Steadier sides for sharing: A high-density foam border surrounds the springs, which means each of you can sleep nearer your own edge without it feeling like it might give way.
- Cushioning for side-sleeping couples: The medium soft pillow top gives shoulders and hips somewhere to sink, which suits two side sleepers sharing a bed of this width.
- Easy to dress: Standard double sheets and a 200 x 200cm double duvet fit, although at 33cm deep you'll want fitted sheets made for a deeper mattress.
- A proper bed for visiting couples: In a guest room, a UK double gives two visitors genuine shared space without the bed taking over a smaller room.
This size suits you if...
You share a bed in a typical UK bedroom and still want bedside tables on both sides, you both prefer a soft, cushioned feel to a firm one, or you're setting up a guest room where visiting couples will sleep.
Consider another size if...
You or your partner are tall, or you already feel cramped at 67.5cm each. We'd recommend the UK king instead, which gives 75cm each; allow at least 2.7m x 2.9m.
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FAQ's
Is the Sleepeezee ActivFlex Response 3600 Pocket Pillow Top double big enough for two people?
For most couples, yes. The UK double gives 67.5cm each. If you'd like more, the UK king gives 7.5cm more each and is 10cm longer, which taller sleepers often appreciate. The encapsulated foam edge means the sides feel firmer to sit or lie near, so less of the UK double's width goes unused.
What size bedroom do I need for a UK double ActivFlex Response 3600 Pocket Pillow Top?
We suggest at least 2.6m x 2.8m. Around 3m x 3m is more relaxed if you want bedside tables on both sides and room to open a wardrobe without squeezing past the bed.
Should I get the UK double or UK small double Sleepeezee ActivFlex Response 3600?
The UK double is 15cm wider than the UK small double, and the two are the same length. For a couple sharing every night, that extra width matters. The UK small double suits a tighter room, where we suggest at least 2.4m x 2.8m, or one person who wants a bit of space.
What bedding fits a UK double Sleepeezee ActivFlex Response 3600 Pocket Pillow Top?
Double sheets and a 200 x 200cm double duvet fit the UK double. The one thing to check is the fitted sheet: the mattress is 33cm deep, so choose sheets the maker says will fit a mattress of that depth, or the corners may keep slipping off.
How big is the Sleepeezee ActivFlex Response 3600 double in feet?
The UK double measures 4ft 6in x 6ft 3in, or 135 x 190cm. Measure the room with those figures, and leave space for bedside tables and walkways before you compare the retailers listed on this page.