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.
- Proper space for two: At 75cm each for two people sharing, you can both change position without negotiating for territory, useful on a firm mattress where you sit on rather than sink in.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double at 200cm, so anyone approaching six foot stops waking with their feet hanging off the end.
- Firm support across the full width: The open coil lattice supports the whole 150cm surface evenly, which means no soft edges when one of you sleeps close to the side.
- Room for the dog too: If a pet claims a corner every night, the extra 15cm of width over a UK double means you keep a workable share of the bed.
- Distance helps with disturbance: Open coils do transfer movement, but 75cm each puts more mattress between you and a partner who gets up hours earlier, which softens the effect.
This size suits you if...
You share the bed every night and a UK double leaves you cramped, one of you is approaching six foot and needs the 200cm length, or your mornings run on different schedules and you want more distance between you when the first alarm goes. Your bedroom should measure at least 2.7m x 2.9m by our guidance, so the king fits without dominating the room.
Consider another size if...
Your bedroom falls short of the 2.7m x 2.9m we suggest, or you sleep alone. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m and still gives a solo sleeper generous room.
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Is the Daphne Ortho UK king big enough for a couple?
Comfortably, for most. It measures 150 x 200cm, giving 75cm each for two people sharing, which is 7.5cm more each than the UK double. On a firm mattress like this you lie on the surface rather than sinking into a dip together, so that extra width is space you actually use.
Will a king size Daphne Ortho suit a tall sleeper?
Yes, and length is often the real reason to choose it. The UK king is 200cm long, 10cm more than the UK double, so a sleeper around six foot gets clearance at the foot of the bed. If width matters less to you than length, the king still makes sense over the double.
Does the king size reduce partner disturbance on an open coil mattress?
Partly. The Daphne Ortho's open coils are joined in a lattice, so movement does carry across the bed more than pocket springs would allow. The king's 75cm each puts more mattress between you, which helps, but a light sleeper sharing with a restless partner should weigh that trade-off.
What room size do I need for the Daphne Ortho in a UK king?
We suggest at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable once wardrobes and bedside tables are in. New build master bedrooms can be tighter than they look on the plan, so measure with the furniture in place before committing to a 150 x 200cm mattress.
Should I go for the UK king or the UK super king in this mattress?
The UK super king is 30cm wider at the same length, giving 90cm each for two sharing against the king's 75cm. It needs a room of at least 3m x 2.9m though. If your room clears that and you both spread out, size up; otherwise the UK king is the sensible middle ground.