Firmness
Type
Pocket Spring
Depth (cm)
29
Number of Layers
6
Trial Period (nights)
Warranty (years)
10
Price Range
£4,999 to £6,499
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Feather & Black, captured September 2026, and from regular price comparison across our UK retail partners.
This is a mattress for buyers who want natural, certified organic materials without compromise. The organic wool and cotton sleep surface breathes well, which means less overnight heat build-up, while the cotton, hemp and flax layer wicks moisture away from you. Natural latex eases pressure at the hips and shoulders, and the 7-turn pocket springs respond to your shape to encourage natural spinal alignment. Being double-sided, you can flip it to even out wear, something many modern mattresses no longer allow. Yes, it's a serious investment, but the hand-sewn side-stitching gives genuine edge-to-edge support and the whole thing is made by hand in Buckinghamshire.
Key Features & what's inside
- Sleep surface. An organic wool and cotton sleep surface that breathes naturally. This helps regulate temperature, so you're less likely to overheat.
- Side-stitching. Three rows of genuine hand-sewn side-stitching, which means the edges stay supportive right to the border. You can sleep or sit near the edge without feeling like you'll roll off.
- Organic lambswool and peace silk. Layers of pure organic British lambswool and ethically farmed peace silk. These add soft, natural cushioning close to the surface.
- Natural moisture-wicking layer. A natural blanket of cotton, hemp and flax that wicks moisture away. Useful if you tend to sleep warm or clammy.
- Natural latex. A natural latex layer that relieves pressure across the body. You should feel this as gentle give under hips and shoulders despite the firm feel.
- Pocket springs. Hypnos' ReActivePro 7-turn pocket springs respond individually to the shape of your body. This encourages natural spinal alignment for a more comfortable sleep.
Layer details from featherandblack.com product page, September 2026.
Who's it NOT for?
This is a firm mattress, so lightweight side sleepers may find it doesn't allow enough sink at the shoulder. It's also a significant outlay at £4,999 upwards, and being double-sided it needs flipping, with each of its two packages weighing 46.8 kg. If you want a light, low-maintenance mattress on a budget, look elsewhere.
Hypnos Organics 4 Mattress
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Is the Hypnos Organics 4 mattress firm or soft?
It's described as firm. That suits back and front sleepers and heavier builds well, although the natural latex layer softens the surface feel slightly. Lightweight side sleepers may find it a little too firm.
What is the Hypnos Organics 4 made of?
It combines organic British lambswool, peace silk, cotton, hemp, flax and natural latex over ReActivePro 7-turn pocket springs. The materials are Soil Association certified organic, and the mattress is hand-crafted in Buckinghamshire, with hand tufting and hand-sewn side-stitching.
Does the Hypnos Organics 4 come with a guarantee?
Feather & Black's listing states a 10-year guarantee, though it's unclear whether this is a manufacturer or retailer term, so it's worth confirming with your chosen retailer before you buy.
Do you need to flip the Hypnos Organics 4?
Yes, it's double-sided, so it's designed to be flipped to even out wear over time. Bear in mind it's a heavy mattress, arriving in two packages of 46.8 kg each, so flipping is a two-person job.
How deep is the Hypnos Organics 4 mattress?
It's 29 cm deep. That's a generously deep mattress, so check your fitted sheets will stretch over it. It's available in UK Single, Double, King and Super King.
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