Hypnos Organics 4 Super King Mattress
The Hypnos Organics 4 is a firm, double-sided pocket sprung mattress made from Soil Association certified organic materials, hand-crafted in Buckinghamshire by Royal Warrant holders.
- Latex eases hip & shoulder pressure
- Double-sided to even out wear
- Handmade in Buckinghamshire
£4,549
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Hypnos Organics 4 Mattress
More available sizes
Mattress details
Mattress
Hypnos Organics 4 Mattress
Size
Firmness
Firm
Construction
Pocket Spring
Wool
Latex
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.
Key benefits
- Distance beats any comfort layer: With 90cm each for two people sharing, a partner who turns all night becomes far easier to sleep through.
- Springs that keep movement local: The ReActivePro 7-turn pocket springs respond individually to each body, so across this width one sleeper's shifting barely reaches the other side.
- Edges you can actually use: Three rows of hand-sewn side-stitching keep the border supportive, useful when a child climbs in and pushes you towards the edge.
- Breathable across a shared bed: The organic wool and cotton surface, backed by a cotton, hemp and flax wicking layer, helps two warm bodies stay cooler through the night.
- Firm support at any spot: Because the whole surface is firm and double-sided, the middle of the bed feels the same as your usual side when everyone piles in.
This size suits you if...
You share the bed most nights and one of you is a genuinely restless sleeper, children or pets treat your bed as theirs, or you have a large master bedroom where the UK king would look undersized. You'll also want firm support and organic materials to matter more to you than price.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest as a minimum, or you'd struggle to flip a mattress this wide regularly. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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FAQ's
How much space do we each get on the Hypnos Organics 4 super king?
90cm each for two people sharing, the most any standard UK size offers. Combined with pocket springs that respond individually to each body, that width means a fidgety partner is felt far less. If children join you in the early hours, there's a realistic chance everyone still gets a usable share.
Will the Hypnos Organics 4 super king fit in my bedroom?
The mattress measures 180 x 200cm. We suggest a room of at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable once you add walking space and furniture. In a loft conversion, check where the slope falls before assuming the bed can sit against your preferred wall.
Is the Hypnos Organics 4 super king difficult to flip?
It's the most demanding size of this mattress to turn. The Organics 4 is double-sided and needs flipping to even out wear, and this is a heavy, hand-crafted mattress at its widest. Plan on two people for the job. If regular flipping worries you, a narrower size of the same mattress is easier to manage.
Should I choose the super king or the UK king in this mattress?
The UK super king is 30cm wider than the UK king; the two are the same length. If a restless partner, children or a large dog regularly share your bed, that extra width matters more than any comfort layer. If your room is tighter, the UK king needs at least 2.7m x 2.9m rather than 3m x 2.9m.
Can I get the super king Hypnos Organics 4 up my stairs?
A 180cm-wide sprung mattress can't be rolled or folded, so tight landings and sharp turns are the real obstacle. Measure your stairwell, door swings and any turns before ordering. Unlike zip and link designs that arrive in two halves, this comes as one full-width mattress, so the route upstairs needs to work.