Silentnight UltraGel Miracoil Pillowtop King Size Mattress
The Silentnight UltraGel Miracoil Pillowtop is a hybrid mattress that pairs a gel infused comfort layer with Silentnight's Miracoil spring system, which means you get pressure relief on top and steady support underneath.
- Gel layer eases hips & shoulders
- Minimises partner disturbance
- 60-night trial & 5-year guarantee
£603.77
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Silentnight UltraGel Miracoil Pillowtop Mattress
More available sizes
Mattress details
Mattress
Silentnight UltraGel Miracoil Pillowtop Mattress
Size
Firmness
Medium Firm
Construction
Foam
Hybrid
Gel
Open Coil Spring
Depth (cm)
29
Layers
2
Layer Details
UltraGel™ comfort layer
A gel infused layer that sits at the top and responds to your movements, which means cushioning that adapts as you shift position. Silentnight describes it as offering supreme comfort with strong pressure relief, so it should ease strain around hips and shoulders.
Miracoil® springs
This spring system runs from head to toe rather than side to side, which is designed to keep your spine aligned through the night. It also helps prevent partner disturbance, so movement on one side of the bed transfers less to the other.
Layer details from silentnight.co.uk product page, September 2026.
Key benefits
- 75cm each for two: Sharing a UK king gives you 75cm each, which is 7.5cm more per person than the UK double, so elbows and knees stay on your own side.
- Less disturbance across the width: The head-to-toe Miracoil springs are designed to limit movement transfer, which means a wider bed plus calmer springs when one of you fidgets.
- 200cm long for taller sleepers: The UK king is 10cm longer than the UK double, which means a partner over six foot can stretch out without feet hanging off the end.
- Cushioning for shifting positions: The UltraGel layer responds as you move, so propping yourself on pillows or rolling onto your side feels supported rather than lumpy.
- Space without super king demands: You get a proper couples' bed while the UK king still fits rooms that would struggle with the UK super king's larger footprint.
This size suits you if...
You share the bed every night and wake when your partner shifts, or you keep different hours and want the early riser to slip out without disturbing anyone. It also suits you if one of you is over six foot and the UK double leaves your feet at the edge.
Consider another size if...
Your bedroom is under our suggested 2.7m x 2.9m. We'd recommend the UK double instead, allowing at least 2.6m x 2.8m.
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FAQ's
Is the Silentnight UltraGel Miracoil Pillowtop UK king big enough for two adults?
For most couples, yes. The UK king gives you 75cm each, compared with 67.5cm each on the UK double. If you want even more personal space, the UK super king gives 90cm each, which is 15cm more per person, but it needs a larger room.
Will I feel my partner move on the UltraGel Miracoil king size?
Less than on many open-sprung beds. The Miracoil springs run head to toe and are designed to reduce partner disturbance, and the UK king's 150cm width puts more distance between you. It helps if you and your partner get up at different times.
Is the Silentnight UltraGel Miracoil UK king long enough for a tall person?
At 200cm long, the UK king is 10cm longer than the UK double and the UK small double. If a partner is approaching or over six foot, that length is often the real reason to size up. The UK super king is the same 200cm length, so it adds width only.
What room size do I need for a Silentnight UltraGel Miracoil UK king?
We suggest at least 2.7m x 2.9m, with 3.2m x 3.2m more comfortable. A new build master bedroom can feel smaller once wardrobes are fitted, so measure the floor space left over, including room to open drawers and walk around both sides.
Should I get the UltraGel Miracoil Pillowtop in a king or super king?
Choose the UK king if 75cm each feels enough and your room is around 2.7m x 2.9m. The UK super king gives 90cm each but we suggest at least 3m x 2.9m for it. Both are 200cm long, so height isn't a reason to pick one over the other.