Firmness
Medium
Type
Pocket Spring
Depth (cm)
26
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
10
Price Range
£719 to £1,649
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
If you're a hot sleeper, the cotton and wool comfort layers are the headline here: natural fibres wick moisture and regulate temperature, which means fewer sweaty nights. The 1000 pocket springs each have six active turns, so the mattress responds quickly as you move rather than leaving you to sink and settle. Edge support is a genuine strength too. Three rows of firmer perimeter springs plus two rows of hand side-stitching mean you can sit or sleep near the edge without that rolling-off feeling. Add the Solotex polyester fibre layer made from recycled materials, a 10-year guarantee and a wide size range from UK Single up to Emperor, and it suits most sleepers who want a natural, medium-feel bed.
Key Features & what's inside
- Sleep surface. A pure unbleached cotton sleep surface, free of harmful chemicals. It's a soft, breathable first point of contact.
- Comfort fillings. Generous layers of cotton and wool, including about 4kgs of traceable British Red Tractor wool, which means good temperature regulation and breathability. The cotton is naturally hypoallergenic, a helpful touch if you're sensitive to dust or synthetics.
- Resilience layer. A plush Solotex polyester fibre filling made from recycled materials, designed for durability. It promotes airflow while adding a cushioned feel between you and the springs.
- Support system. 1000 ReActivePro pocket springs, each with six active turns, so the mattress reacts faster to your movements. That translates to pressure relief and spinal alignment tailored to how you actually sleep.
- Edge support. The Triple Edge Protection system uses three rows of firmer springs around the perimeter for edge-to-edge support. Two rows of traditional hand side-stitching finish the job, a sign of proper craftsmanship.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you need a very soft, cradling feel, this medium tension may not give you enough sink, and one owner actually found it firmer than described. Budget shoppers should also pause: at £719 and up, there are cheaper pocket spring options, though few with this level of natural filling.
Hypnos Clinton Cotton Deluxe Mattress
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Is the Hypnos Clinton Cotton Deluxe firm or medium?
It's listed as a medium tension. That said, firmness is subjective: one verified owner review described it as feeling more like a firm and reported some morning aching. If you're a lightweight sleeper who prefers a softer surface, it may feel slightly firmer than the label suggests.
Does the Hypnos Clinton Cotton Deluxe come with a trial?
Mattress Online lists a 100-night trial with this mattress, and owner feedback suggests the trial and exchange process is straightforward. Bear in mind this is the retailer's own offer rather than a Hypnos policy, so terms may differ if you buy elsewhere.
How long is the guarantee on the Hypnos Clinton Cotton Deluxe?
It comes with a 10-year guarantee, which appears to be the manufacturer's own cover rather than a retailer term. That's a reassuring span for a mattress at this price.
What is the Hypnos Clinton Cotton Deluxe made of?
It combines cotton, wool, soft white fibres and a Solotex polyester fibre layer made from recycled materials, over 1000 six-turn pocket springs. It's 26cm deep, handcrafted in the UK, and the natural fillings include around 4kgs of traceable British Red Tractor wool for breathability.
What sizes does the Hypnos Clinton Cotton Deluxe come in?
Eight sizes are available: UK Single, Small Double, Double, King, Super King and Emperor, plus EU Double and EU King. Prices run from £719 to £1,649 depending on the size you choose.
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