Hypnos Cawthorne Support Mattress
Mattress
Hypnos Cawthorne Support Mattress
Size
Firmness
Firm
Construction
Depth (cm)
25
Layers
7
Layer Details
- Cover. A soft to touch Belgian damask cover, which gives a more traditional, upholstered feel than a knitted stretch fabric.
- Comfort layer. A blend of cotton and polyester that combines their comforting properties with increased breathability and moisture wicking. In practice, that means less clamminess on warmer nights.
- eOlus fibres. Hypnos' exclusive eOlus fibres are made from recycled materials and spun into breathable fibres that promote airflow to dispel heat. They also contribute to the secure, firmer feel this mattress is built around.
- Soft White Fibres. Soft synthetic fillings that create a cosy feel while staying durable and resilient. They're designed to maintain their shape rather than compressing into dips over time.
- Support pad. A dual density polyester pad that protects the spring unit and encourages equal weight distribution, which means the springs beneath wear evenly.
- Spring core. 1200 ReActive springs, each sitting in its own fabric pocket to increase responsiveness and isolate movement. You should feel less of a partner shifting about on the other side.
- Edge support. The outer rows of springs use a firmer gauge, reinforced with a durable rod edge. That gives you a sturdier perimeter for sitting on the edge and makes the full sleeping surface usable.
Layer details from mattressonline.co.uk product page, September 2026.
- Room to sleep apart, together: At 75cm each for two people sharing, you can settle into your own position without negotiating for space all night.
- Movement stays on one side: The 1200 ReActive springs sit in individual fabric pockets, which means a partner leaving for an early shift is far less likely to wake you.
- Extra length for taller sleepers: The UK king is 10cm longer than the UK double, so a sleeper approaching six foot no longer has feet hanging off the end.
- The whole width is usable: Firmer gauge outer springs and a rod edge keep the perimeter sturdy, so neither of you loses part of that 150cm width to a saggy edge.
- Firm support across a wide surface: A genuinely firm feel across the full 150 x 200cm suits back and front sleepers who want the same solid support wherever they end up.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, especially if one of you keeps waking the other. Or one of you is close to six foot and needs the 200cm length as much as the width. The firm feel also suits couples where both partners sleep on their back or front and want proper support rather than sink.
Consider another size if...
Your bedroom can't comfortably take a king; we suggest at least 2.7m x 2.9m for this size. If space is tight, we'd recommend the UK double instead, allowing at least 2.6m x 2.8m.
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Is the Hypnos Cawthorne Support in a UK king good for couples?
It's one of the better matches of size and construction for sharing. The UK king gives 75cm each for two people sharing, and the 1200 pocket springs isolate movement, so a partner shifting or getting up early disturbs you less. The firmer edge means the full width is usable rather than just the middle.
How much space do we each get on a king size Hypnos Cawthorne?
The UK king measures 150 x 200cm, which works out at 75cm each for two people sharing. That's 15cm more width overall than the UK double, a difference you notice most if one of you sleeps on a different schedule or you currently wake each other turning over.
Is the UK king Cawthorne long enough for someone over six foot?
At 200cm long (the UK king is 5ft x 6ft 6in), it's 10cm longer than the UK double, which is often the point of upgrading for taller sleepers. If you're comfortably over six foot, that extra length usually matters more than the extra width, and the firm feel keeps support consistent right to the foot of the bed.
What room size does the Hypnos Cawthorne king need?
We suggest a room of at least 2.7m x 2.9m for a UK king. That allows walking space on both sides and drawers that still open. In a new build master bedroom, measure after accounting for wardrobes; if it's tighter than that, the UK double needs at least 2.6m x 2.8m and may fit your room better.
Where can I buy the Hypnos Cawthorne Support in a king?
Availability shifts, so the most reliable answer is the live comparison table on this page, where prices are updated as retailers change them. Compare the retailers listed here rather than relying on a single store, and check the exact size name before checkout, since the UK king (150 x 200cm) is easily confused with EU sizing.