Silentnight SleepResponse Reflex 1600 Combination Super King Mattress
The Silentnight SleepResponse Reflex 1600 Combination Mattress has a gel comfort layer that is 5x more breathable than standard memory foam, which means a cooler night's sleep on top of 1600 pocket springs.
- Gel layer keeps you cooler
- Contouring foam eases pressure
- Suits any sleeping position
£1,799
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Silentnight SleepResponse Reflex 1600 Combination Mattress
More available sizes
Mattress details
Mattress
Silentnight SleepResponse Reflex 1600 Combination Mattress
Size
Firmness
Construction
Foam
Gel
Pocket Spring
Depth (cm)
26
Layers
2
Layer Details
Reflex Gel comfort layer
A flexible gel layer that Silentnight says is 5x more breathable than standard memory foam. That means a cooler sleeping surface and a feel that responds as you move.
Mirapocket pocket spring unit
A unit of 1600 pocket springs, with reflex foam for pressure relief and body-contouring support. It gives you support underneath while the foam cushions your shoulders and hips.
Layer details from bedsava.co.uk product page, November 2026.
Key benefits
- A full 90cm each: Two sharers each get 90cm, which means a partner who turns all night is far easier to sleep through than on a narrower bed.
- 15cm more each than a UK king: Sizing up from the UK king adds 30cm of width but no extra length, so the gain goes entirely into elbow room.
- Room for night-time visitors: When a small child wanders in at 3am or the dog settles at your feet, the 6ft width gives everyone a share without anyone clinging to the edge.
- Cooler with more bodies: Extra people in the bed means extra warmth, and the gel comfort layer with its CoolEase woven cover is designed to draw that heat away.
- Fits a large room properly: In a generous master bedroom or a period property with high ceilings, a UK super king fills the space in proportion where a UK king can look a little lost.
This size suits you if...
You share with a partner who kicks, fidgets or gets up often, and distance matters more to you than any comfort layer. It also suits you if young children or a large dog join you most nights, and your bedroom comfortably clears 3m x 2.9m.
Consider another size if...
Your bedroom is under 3m x 2.9m, or the loft slope leaves too little standing room around the bed. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
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FAQ's
What are the dimensions of the Silentnight SleepResponse Reflex 1600 super king?
It measures 180 x 200cm, or 6ft x 6ft 6in, and stands 26cm deep. That depth is the same across every size, so the height of the bed won't change if you move up from a smaller one, but the footprint will grow considerably.
How much extra space does a UK super king give compared with a UK king?
A UK super king is 30cm wider than a UK king and exactly the same length. Shared between two, that works out at 15cm more each: 90cm per person rather than 75cm. If your feet already reach the end of a UK king, sizing up won't help with that.
What size bedroom do I need for a UK super king mattress?
We suggest at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable once bedside tables and wardrobe doors are in play. In a loft conversion, the sloping ceiling usually decides which wall the headboard goes against, so measure the full-height floor area rather than the whole room.
Is a super king big enough for two adults and a young child?
For most families, yes. Each adult starts with 90cm, so a small child arriving in the night can fit between you without anyone being pushed to the edge. A large dog as a regular fixture is a slightly tighter squeeze, although still far roomier than a UK king.
Will a super king mattress fit through my door and up the stairs?
At 180cm wide, a UK super king is the size most likely to stick on a tight landing turn or catch an inward-opening bedroom door. Measure both before ordering, then compare the retailers listed on this page. Budget for super king sheets and a 260 x 220cm duvet too.