Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Super King 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
£1,699
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Sleepeezee ActivFlex Response 3600 Pocket Pillow Top Mattress
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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
- 90cm each when sharing: Two adults get 90cm apiece, which means a partner rolling over happens at a distance rather than right beside you.
- Room for a small visitor: When a child or the dog joins you, the extra 30cm of width over a UK king means nobody is pushed onto the edge.
- Steady sides across the full width: The high-density foam border runs around the whole spring unit, so the outer strip of this wide surface stays usable for sleeping and steady for sitting.
- Same length as the UK king: At 200cm long, the UK super king adds width only, so taller sleepers lose nothing and the room length we suggest stays at 2.9m.
- Cushioning that suits a big shared bed: The pillow top and two Staycool Gel layers give side sleepers a soft, pressure-easing surface across all 180cm, rather than a narrow comfortable middle.
This size suits you if...
You share every night with someone restless and want real distance between you, or children and pets regularly end up in your bed. It also suits you if your bedroom is a generous master or a high-ceilinged period room where a smaller bed would look lost.
Consider another size if...
Your bedroom is smaller than our suggested 3m x 2.9m, or tight stairs and landings worry you. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
Is the Sleepeezee ActivFlex Response 3600 super king big enough for two adults and a child?
For a child who climbs in partway through the night, usually yes. Two adults start with 90cm each, so a small body in the middle still leaves everyone a reasonable share. If it happens every night with an older child, you will feel the squeeze a little, but far less than on a UK king.
What size bedroom do I need for a super king pillow top mattress?
We suggest at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable once bedside tables and a wardrobe are in. In a loft conversion, measure where the ceiling slope allows you to sit up, as that usually decides which wall the bed goes on.
How much more room does a super king give than a king?
The UK super king is 30cm wider than the UK king and the same 200cm length. Shared between two people, that works out at 15cm more each. If length is your issue rather than width, sizing up will not help.
What bedding fits a 33cm deep super king mattress?
You need super king sheets and a 260 x 220cm duvet. At 33cm deep with a pillow top, look for extra-deep fitted sheets, as standard ones can pop off the corners. Super king bedding also costs more than king, so add it to your budget.
Will a super king mattress fit up my stairs?
At 180cm wide and 33cm deep with a pillow top, the UK super king is a large, awkward item to carry. Measure door widths, the swing of each door and any tight landing turns before ordering, then compare the retailers listed on this page. If access looks tight, the UK king is 30cm narrower.