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.
- Distance beats movement transfer: Open coil springs pass on more motion than pocket springs, so the 90cm each of a UK super king does more here than on most mattresses.
- Extra firm support across the full 6ft: The Miracoil zones run the whole 180cm width, which means both sleepers get the same rigid, aligned support wherever they end up.
- Room for night-time visitors: When a child pads in at 3am, a UK super king absorbs the extra body without either adult ending up on the edge.
- A firm surface suits sprawlers: Restless sleepers who roll and stretch stay on top of an extra firm mattress rather than sinking, so all that width actually gets used.
- Easier to move than you'd think: At 22cm deep it's shallower than many hybrids, which helps when manoeuvring a 6ft x 6ft 6in mattress around a landing.
This size suits you if...
You share the bed every night with a partner who fidgets, and want physical distance rather than clever springs to solve it. Or your household treats the bed as communal, with children or a large dog joining regularly, and you need everyone to keep a fair share. You'll also need the room: we suggest at least 3m x 2.9m before a UK super king feels sensible.
Consider another size if...
Your bedroom measures under our suggested 3m x 2.9m minimum, or you'd struggle to get a 180cm-wide mattress up your stairs. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
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Is the Silentnight Ortho Dream Star super king good for couples?
Yes, arguably more than the smaller sizes. The Miracoil system is open coil, so you feel a partner's movement more than you would on pocket springs. With 90cm each for two people sharing, most of that movement happens too far away to wake you. Both of you do need to want an extra firm feel, though.
How much space do two people get on the Ortho Dream Star super king?
90cm each for two people sharing, across a 180 x 200cm surface. Because the mattress is extra firm, you sleep on top of it rather than settling into a dip, so that full width stays usable. It also leaves genuine room when a child or dog joins during the night.
Will the Silentnight Ortho Dream Star super king fit in my bedroom?
The mattress itself is 180 x 200cm, or 6ft x 6ft 6in. We suggest a room of at least 3m x 2.9m so you can still open doors and walk around both sides. In a large master or a period property it looks in proportion; in an average double room it will dominate.
Should I get the Ortho Dream Star in a UK king or a UK super king?
The UK super king is 30cm wider than the UK king, and both are the same length. If a restless partner or visiting children are the issue, that extra width is the point of sizing up. If your room falls short of 3m x 2.9m, the UK king would suit you better, needing at least 2.7m x 2.9m.
Is the super king Ortho Dream Star hard to get upstairs?
It's the trickiest size of this mattress to move: 180cm wide and, as a sprung open coil design, it won't fold or roll around a tight landing turn. The relatively shallow 22cm depth helps a little. Measure your stairwell, door frames and any turns before ordering, and check the retailers listed on this page for delivery options.