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.
- A shared size for ordinary rooms: At 135 x 190cm, this double leaves space for a wardrobe and drawers in the sort of bedroom most UK couples actually have.
- Motion isolation where it counts: With 67.5cm each for two people sharing, the 1200 pocket springs keep a partner's movement to their side, useful when you're sleeping closer than you would on a UK king.
- Usable right to the edge: Firmer gauge outer springs and a rod edge make the perimeter sturdy, so neither of you loses sleeping space to a saggy side.
- Firm support for two: The genuinely firm feel suits back and front sleepers, and it holds its shape rather than dipping where each of you lies.
- Bedding is easy and cheap: Double sheets and duvets are stocked everywhere, a small but real saving over less common sizes.
This size suits you if...
You're a couple who wants solid, firm support and your bedroom is closer to the 2.6m x 2.8m minimum we suggest than to king-friendly proportions, or you're a solo back or front sleeper who likes room to spread out. It also makes sense for a guest room that hosts visiting couples, where a firm, durable pocket spring bed will cope with different sleepers over the years.
Consider another size if...
You and your partner both toss about or you're used to more personal space. The UK double gives 67.5cm each, so we'd recommend the UK king instead, which is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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What are the dimensions of the Hypnos Cawthorne Support UK double?
It measures 135 x 190cm, which is 4ft 6in x 6ft 3in, with a depth of 25cm. That's the standard UK double footprint, so any double bed frame, double sheets and a standard double duvet will fit without hunting for special sizes.
How much space does each person get on the Cawthorne Support UK double?
Two people sharing get 67.5cm each. That's snugger than a UK king, but the 1200 pocket springs isolate movement well, so you feel less of a partner shifting, and the reinforced rod edge means you can use the full width right to the sides.
What room size do I need for the Cawthorne Support in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves enough clearance for bedside tables on both sides and a wardrobe, which is the usual squeeze in a typical UK master or a first flat.
Should a couple choose the Cawthorne Support in a UK double or a UK king?
It depends on your room more than the mattress. The UK double is 15cm narrower and 10cm shorter than the UK king, and the firm feel and edge support are identical in both. If your room clears the 2.7m x 2.9m we suggest for a UK king, the extra width is usually the better buy for two.
Is the UK double Cawthorne Support a good choice for a guest room?
Yes, provided your guests are happy with a firm feel. A double accommodates visiting couples without dominating a smaller second bedroom, and the resilient fillings are designed to hold their shape, sensible for a bed that's slept in irregularly by different people.