Silentnight Ortho Dream Star Miracoil Mattress
Mattress
Silentnight Ortho Dream Star Miracoil Mattress
Size
Firmness
Extra Firm
Construction
Depth (cm)
22
Layers
3
Layer Details
- Damask cover. A finely woven, durable fabric that feels soft against the skin, which means a pleasant surface without the heat retention some covers suffer from. It's built for long-lasting performance too.
- Eco Comfort Fibre. Fibres made from recycled materials and 100% sustainable sources, offering breathable, fresh comfort. This is the layer that softens the very top of an otherwise rigid mattress, though only slightly.
- Miracoil Springs. Silentnight's own open coil spring system, arranged into separate support zones. In practice this means your weight is distributed evenly and your spine gets consistent support across the whole surface.
Layer details from mattressonline.co.uk product page, September 2026.
- Space that softens the movement issue: Open coil springs do pass on more motion than pocket springs, but 75cm each puts real distance between you, so a partner turning over registers less.
- Extra length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK Double, welcome if one of you is approaching six foot and tired of feet hanging off the end.
- Zoned support across a wider surface: The Miracoil zones give firmer resistance where your body is heaviest, and in a UK king each sleeper sits fully within the support rather than sharing a middle.
- An affordable size upgrade: Extra firm open coil mattresses sit at the cheaper end of the market, so moving up to a UK king costs less here than with most pocket sprung rivals.
- Fits a typical master bedroom: We suggest allowing at least 2.7m x 2.9m, which most UK master bedrooms can manage even once fitted wardrobes have taken their share of a new build.
This size suits you if...
You share the bed every night and find a double leaves you feeling each other's every movement, especially on an open coil design like this one. You or your partner keep different hours, so one of you gets up early and the other needs to sleep through it. Or one of you is tall enough that the extra length is the real draw, provided you both genuinely want an extra firm surface.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest for a UK king. The UK double would suit a smaller room better, and we'd allow at least 2.6m x 2.8m for that size.
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Is a UK king big enough for couples on the Silentnight Ortho Dream Star?
Yes, for most couples. At 150 x 200cm you get 75cm of width each, a clear step up from a double. Because the Miracoil system is open coil, you'll feel a partner's movement more than on pocket springs, so that extra personal space does genuine work in reducing disturbance through the night.
Does the king size Ortho Dream Star reduce partner disturbance?
The size helps, the spring type doesn't. Open coil designs pass on more motion than pocket springs, so if one of you leaves for work hours before the other, expect some movement to carry. The UK king's 75cm per sleeper offsets a good deal of that. Very light sleepers sharing with a restless partner may still notice it.
How long is the Silentnight Ortho Dream Star in a UK king?
It's 200cm long, which is 10cm more than the UK double. If either of you is around six foot or taller, that extra length is arguably a bigger upgrade than the width, keeping feet on the mattress rather than pressed against a footboard. In imperial terms the UK king measures 5ft x 6ft 6in.
Will a UK king fit my bedroom?
We suggest allowing at least 2.7m x 2.9m, which leaves room to walk round both sides and open drawers. New build master bedrooms often look generous until wardrobes go in, so measure the usable floor rather than the full room. If space is tight, the UK double needs slightly less, at least 2.6m x 2.8m by our guidance.
Should I get the king or super king in this mattress?
The UK super king is 30cm wider than the UK king, and the two are the same length. If your room can take it, we suggest at least 3m x 2.9m, the extra width helps further with the movement transfer an open coil mattress brings. For most couples the UK king is the sensible balance of space and room demands.