Hypnos Wool Tranquility Super King Mattress
The Hypnos Wool Tranquility is a medium firm pocket sprung mattress built around natural fibres: sustainably sourced British wool and cotton over 1400 of Hypnos's ReActive 8-turn pocket springs.
- Less clammy than all-foam beds
- Hips sink in, shoulders stay supported
- Suits back & combination sleepers
£1,129
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Hypnos Wool Tranquility Mattress
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Mattress details
Mattress
Hypnos Wool Tranquility Mattress
Size
Firmness
Medium Firm
Construction
Wool
Depth (cm)
29
Layers
5
Layer Details
Viscose Blend Breathable Sleep Surface
A soft viscose blend cover that promotes airflow, which means the sleep surface stays cooler and fresher through the night.
Sustainably Sourced British Wool
British wool gives gentle cushioning with impressive resilience. In practice that means a comfort layer that keeps its shape rather than developing body impressions quickly.
Sustainably Sourced Cotton
Natural cotton fibres are highly breathable and wick away excess moisture. You'll feel this as a cooler, drier surface, particularly useful if you tend to overheat.
eOlus™ Fibres
These fibres offer a soft, foam-like feel while letting air and moisture pass through easily. You get the comfort of foam without the heat retention it's often criticised for.
ReActive™ 8-Turn Pocket Springs
The base is 1400 individually responsive pocket springs, each with 8 turns, engineered for total spinal and body support. Each spring senses and adjusts independently, so movement on one side of the bed is less likely to disturb the other.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- 90cm each for two people sharing: Each of you gets 90cm of space, so a partner who turns over frequently is far enough away to become easy to ignore.
- Springs that keep the peace at this width: The 1400 ReActive 8-turn pocket springs respond individually, and combined with 90cm each per sleeper, movement on one side rarely carries across to the other.
- Room for the whole household: When a child pads in at 3am or the dog treats the bed as routine, 180cm of width means nobody ends up clinging to the edge.
- Wool and cotton across a bigger surface: The British wool and cotton layers wick moisture, which matters more when two warm bodies, and sometimes more, share the same mattress all night.
- A 29cm flat-delivered natural mattress: At this footprint the mattress arrives flat rather than rolled, so measure door swings and landing turns before you order.
This size suits you if...
You share the bed every night and a UK king has started to feel cramped, you sleep next to a genuinely restless partner and want distance as well as spring separation, or your children or pets regularly join you and everyone still needs their own share. Your bedroom should measure at least 3m x 2.9m, and closer to 3.5m x 3.2m will feel comfortable.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest as a minimum, or you'd rather spend less on bedding and bed frames. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
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FAQ's
Is the Hypnos Wool Tranquility super king big enough for a family sharing?
For occasional sharing, yes. At 180 x 200cm it gives two adults 90cm each, so when a child climbs in there's still usable space rather than a squeeze. The 1400 pocket springs also respond independently, which means a small wriggling visitor disturbs the mattress locally rather than across the whole surface. Regular co-sleeping with two children is still a stretch.
What room size do I need for a super king Hypnos Wool Tranquility?
We suggest a minimum of 3m x 2.9m, and around 3.5m x 3.2m to walk round the bed comfortably with bedside tables on both sides. In a large master or a period property with generous proportions, a UK king can look undersized, and the super king fills the space properly. Check door swing and any tight landing turns too.
Does the super king Hypnos Wool Tranquility help with a restless partner?
This is arguably its strongest case. Distance does more than any comfort layer, and 90cm each is the most separation a standard UK size offers. On top of that, each of the 1400 ReActive 8-turn pocket springs adjusts independently, so when your partner rolls over the movement is less likely to travel across to your side.
How much bigger is the super king than the king in this mattress?
The UK super king is 30cm wider than the UK king, and the two are the same length at 200cm. All of that extra width goes into personal space: 90cm each rather than sharing 150cm between you. The trade-off is room size. We suggest at least 3m x 2.9m for the UK super king, against 2.7m x 2.9m for the UK king.
Can two people of very different weights share the Hypnos Wool Tranquility super king?
Yes, and this size handles it well. Because the pocket springs sense and adjust individually, a heavier hip can sink while a lighter frame stays supported, and with 90cm each you're mostly sleeping on your own set of springs anyway. The medium firm tension suits most back and combination sleepers, though lightweight side sleepers may find it slightly firm.