MattressNextDay Daphne Ortho Traditionally Sprung Mattress
Mattress
MattressNextDay Daphne Ortho Traditionally Sprung Mattress
Size
Firmness
Firm
Construction
Depth (cm)
30
Layers
3
Layer Details
- Soft Knitted Cover. A breathable knitted cover that's soft to the touch, which means the firm build doesn't feel harsh against your skin. It gives the mattress a slightly more luxurious finish than you might expect at this price.
- Soft White Fibres. Fibre fillings made from 100% polyester sit beneath the cover, offering good recovery and durability. In practice, this means a comfort layer that springs back rather than developing dips quickly.
- Open Coil Springs. Interlaced coils of high-tensile steel joined together in a lattice, which means the springs work as one connected system to support your body. This is a traditional construction, so expect firm, even support rather than the isolated contouring of pocket springs.
Layer details from mattressnextday.co.uk product page, September 2026.
- Distance beats motion transfer: Open coils joined in a lattice carry movement across the bed, so the 90cm each a UK super king provides is the most effective fix for a restless partner.
- Room for night-time visitors: When a child pads in at 3am, or the dog treats the bed as routine, the firm, even surface and full 6ft of width mean everyone keeps a workable share.
- Firm support across the full width: The high-tensile steel springs work as one connected system, which means the edges and middle of this large surface feel consistently supportive rather than saggy in patches.
- A big bed at a modest price: Super kings usually carry a premium; this one keeps the traditional build simple, so upgrading to maximum sleeping space stays affordable.
- Substantial without being unmanageable: At 30cm deep across a 180cm width, it fills a large frame properly, though you'll want two people for turning and getting it upstairs.
This size suits you if...
You share the bed most nights and one of you moves around enough to wake the other, since on an open coil mattress extra width is the surest way to sleep undisturbed. It also fits if children or pets regularly join you and you'd rather everyone had firm, even support than squeeze onto a UK king, and your bedroom comfortably clears our suggested 3m x 2.9m minimum.
Consider another size if...
Your room is under our suggested 3m x 2.9m minimum, or you sleep alone. We'd recommend the UK king instead: it's 30cm narrower and the same length, still gives 75cm each for two sharing, and we suggest at least 2.7m x 2.9m for it.
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Is the Daphne Ortho super king too big for my bedroom?
The UK super king measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m so you can walk round both sides and open drawers. Measure with the door swing included. If that's tight, the UK king is 30cm narrower at the same length, and we suggest at least 2.7m x 2.9m for it.
Does the super king help with movement on an open coil mattress?
It's the best-suited size for it. The Daphne Ortho's open coils are joined in a lattice, so movement travels across the bed more than pocket springs allow. With 90cm each, the UK super king puts real distance between you, which softens the effect considerably. Sensitive couples on a narrower size would notice fidgeting far more.
How much more space does a super king give than a king?
The UK super king is 30cm wider than the UK king; both are 200cm long. For two people sharing, that works out at 15cm more each, taking you from 75cm to 90cm apiece. On a firm mattress like the Daphne Ortho, where you tend to sleep on the surface rather than sink in, that extra width is genuinely felt.
Will a super king mattress get up the stairs?
A sprung mattress this size can't be rolled or folded, so measure your staircase, any landing turns and the bedroom doorway before ordering. The mattress is 180cm wide, 200cm long and 30cm deep. Tight Victorian stairwells and loft conversions are the usual sticking points, and you'll want two people to carry it.
Is the Daphne Ortho super king good for sharing with children?
It's a sensible match. The firm open coil support stays even across the full 180cm width, so a child climbing in between you doesn't create a dip everyone rolls into. With 90cm per adult to start with, you can give up a little space and still sleep. Lightweight children will simply lie on the firm surface rather than sink.