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.
- 90cm each, every night: Two sleepers get 90cm each, which means a partner who shifts about all night is simply further away and easier to ignore.
- Motion isolation across a wider bed: The 1200 ReActive springs sit in individual fabric pockets, so movement on one side stays on that side, and the extra width doubles the effect.
- Usable right to the edge: Firmer gauge outer springs with a rod edge mean the full 180cm is sleepable, so nobody perches nervously near the side.
- Space for the whole household: When children pad in at 3am or the dog claims the foot of the bed, a UK super king still leaves the adults a fair share.
- Firm support at full width: The firm feel keeps you supported across the whole surface rather than rolling towards the middle, helpful when two people of different weights share.
This size suits you if...
You share the bed every night and want the maximum space stocked as standard, your children or pets regularly join you and a UK king already feels crowded, or you have a large master bedroom where a smaller bed would look lost. It also suits you if your partner is genuinely restless, because at this width distance does more than any comfort layer could.
Consider another size if...
Your bedroom can't comfortably take a 180cm wide bed, or you'd struggle to get one up the stairs. The UK king is 30cm narrower at the same length, and we suggest allowing at least 2.7m x 2.9m for it.
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Will the Hypnos Cawthorne Support super king fit in my bedroom?
We suggest a minimum of 3m x 2.9m for a UK super king, with around 3.5m x 3.2m feeling more comfortable once you add bedside tables and walking space. Measure door swing and any landing turns too. In a smaller room, the UK king needs at least 2.7m x 2.9m and may suit you better.
Is a super king Hypnos Cawthorne Support good for restless couples?
Yes, arguably the best case for it. The pocket springs already isolate movement, each responding individually rather than transferring motion across the bed, and at 90cm of width each a fidgeting partner is far enough away that most disturbances never reach you. The firm feel also stops you both rolling towards the centre.
How big is the Hypnos Cawthorne Support in a UK super king?
It measures 180 x 200cm, or 6ft x 6ft 6in. That makes it 30cm wider than the UK king at the same length, and 45cm wider and 10cm longer than the UK double. It's the largest size UK retailers stock as standard, so bedding is easy to find.
Is this size worth it if children or pets share the bed?
If that happens most weeks, yes. A UK super king gives you 180cm of width, so a child between you or a dog at your feet still leaves both adults a reasonable share. The reinforced rod edge helps here too, keeping the sides supportive when someone ends up sleeping near the perimeter.
Where can I buy the Hypnos Cawthorne Support super king?
Availability varies by size, and the UK super king isn't always stocked as widely as the UK double or UK king. Compare the retailers listed on this page: the prices shown are updated as retailers change them, so what you see reflects current stock rather than a snapshot.