Silentnight Comfort Gel Memory Foam Mattress
Mattress
Silentnight Comfort Gel Memory Foam Mattress
Size
Firmness
Construction
Depth (cm)
15
Layers
3
Layer Details
- Soft Touch Quilted Cover. A quilted fabric finish that gives a smooth, breathable sleep surface. It's the first thing you'll feel, and the quilting adds a little softness over the firm foam beneath.
- Cool Gel Memory Foam. This layer provides pressure relief and support, cradling your shoulders and hips as you settle in. The gel infusion regulates body temperature better than standard memory foam, which means less of the overheating foam is known for.
- Supportive Miratex® Foam. Miratex® foam conforms to the shape of your body as you sleep. It provides edge to edge support with no roll together, so you get the full sleeping surface rather than drifting toward the middle.
Layer details from mattressnextday.co.uk product page, September 2026.
- Space for two to sleep separately: At 75cm each for two people sharing, you can both stretch out without negotiating territory in the small hours.
- Foam absorbs movement: All-foam designs transfer less motion than springs, which means an early alarm on one side is less likely to wake the other.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double at 200cm, a genuine relief for anyone approaching six foot.
- Edge to edge support across the full width: The Miratex® base resists roll-together, so the whole 150cm is usable rather than both of you drifting toward the middle.
- Cool gel across a bigger surface: The gel-infused layer regulates temperature better than standard memory foam, useful when two bodies are warming one bed.
- A slim profile that suits divans: At 15cm deep, this king sits neatly on divan bases and adjustable frames, though it may look shallow on a tall bedstead.
This size suits you if...
You share the bed every night and a double no longer feels like enough room for two, one of you gets up hours before the other and you want their exit to go unnoticed, or one partner is over six foot and keeps finding their feet at the end of the mattress. The extra 10cm of length over the UK double solves that quietly.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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Is the Silentnight Comfort Gel in a UK king good for couples?
Yes, with a caveat. The 150cm width gives 75cm each for two people sharing, and foam transfers less movement than springs, so different bedtimes disturb each other less. The firm feel suits most sleepers, although a lightweight side sleeper may find it a little unforgiving on shoulders and hips, so agree on firmness before you buy.
Should I buy this mattress in a UK double or a UK king?
The UK king is 15cm wider and 10cm longer than the UK double, which is the difference between sharing a bed and each having your own half. If your room allows at least 2.7m x 2.9m and you share every night, size up. Solo sleepers or smaller rooms are better served by the UK double.
Is the UK king Silentnight Comfort Gel long enough for tall sleepers?
At 200cm, the UK king is 10cm longer than the UK double, so anyone approaching six foot gains real toe room. Silentnight describes the feel as firm with a slim 15cm profile, which taller or heavier sleepers may notice more, but on length alone the UK king is the sensible choice of the three sizes.
What room size do I need for this mattress in a king?
We suggest at least 2.7m x 2.9m for a UK king, which leaves walking room on both sides once bedside tables go in. A new build master bedroom can feel tighter than the floor plan suggests once wardrobes are fitted, so measure the usable floor, not the room. If it's under our minimum, the UK double needs at least 2.6m x 2.8m.
Will one of us waking early disturb the other on this king?
Less than on most sprung mattresses. The gel memory foam and Miratex® base absorb movement rather than bouncing it across the bed, and 75cm each for two people sharing means you're rarely close enough to jostle. It won't erase every disturbance, but for partners on very different schedules it helps noticeably.