Hypnos Organics 4 Mattress
Mattress
Hypnos Organics 4 Mattress
Size
Firmness
Construction
Depth (cm)
29
Layers
6
Layer Details
- 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.
- The classic couples' footprint: At 135 x 190cm, or 4ft 6in x 6ft 3in, the UK double gives two sharers 67.5cm each, the long-standing UK standard.
- Room left over for furniture: Allow 2.6m x 2.8m and you should still fit bedside tables on both sides, which the UK king often makes a squeeze.
- Firm support across the full width: Three rows of hand-sewn side-stitching keep the edges supportive, useful on a double where two sharers each sleep close to the border.
- Breathable when sharing: Two bodies raise the temperature under one duvet, and the organic wool and cotton surface breathes to reduce overnight heat build-up.
- Flippable, so wear evens out: Being double-sided, you can rotate and flip it to spread wear across both sleepers' sides, something few modern mattresses allow.
- Easy to dress: Standard double sheets and a 200 x 200cm double duvet fit, both stocked everywhere at every price.
This size suits you if...
You share the bed every night and your room sits around the typical UK size, where a UK king would leave little walking space, or you sleep alone and want generous room to spread out on a firm, natural mattress. It also suits a well-furnished guest room that hosts visiting couples, since the firm feel tends to work for a range of unknown sleepers.
Consider another size if...
You and your partner both like space and your room measures at least 2.7m x 2.9m. The UK king of this mattress is 15cm wider and 10cm longer, and we'd recommend it instead for nightly sharing.
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Is a UK double Hypnos Organics 4 big enough for two people?
It gives 67.5cm each for two people sharing, the traditional UK standard for couples. Most sharers find that comfortable, and the hand-sewn side-stitching means the edges stay supportive, so neither of you loses usable width near the border. If either of you sleeps restlessly or you simply like space, the UK king is 15cm wider.
What are the dimensions of the Hypnos Organics 4 in a UK double?
The UK double measures 135 x 190cm, which is 4ft 6in x 6ft 3in. That makes it 15cm wider than the UK small double and the same length, while the UK king is 15cm wider and 10cm longer again. Standard double sheets and a 200 x 200cm duvet fit it.
What size room do I need for the UK double version?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows bedside tables on both sides and space to walk around the bed. If your room reaches 2.7m x 2.9m or more, the UK king of this mattress becomes a realistic option too.
How heavy is the Hypnos Organics 4 double to move and flip?
It arrives as two packages of 46.8kg each, so plan for two people on delivery day, particularly with turning stairs in older terraces or a tight new build landing. Because it's double-sided, you'll also need to flip it periodically to even out wear, and that is a two-person job at this weight.
Should a couple choose this mattress in a double or a king?
The UK double suits most shared bedrooms: it leaves room for wardrobes and drawers where the UK king, at 15cm wider and 10cm longer, can dominate. Choose the UK king if your room allows at least 2.7m x 2.9m and you both value space, since this is a firm mattress you'll share for many years. Compare the retailers listed on this page for both.