Hypnos Wool Tranquility 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
£679
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The Hypnos Wool Tranquility is 29cm deep and made in the UK by an NBF-approved manufacturer, which means the materials and construction have been independently audited. The size range is unusually wide, stretching from UK Small Single up to Emperor, with EU sizes too. Hypnos backs it with a 5-year guarantee. If you want a natural-fill, breathable feel without the price of a fully handmade traditional mattress, this sits in a sensible middle ground.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
29
Number of Layers
5
Trial Period (nights)
Warranty (years)
5
Price Range
£679 to £1,399
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The appeal here is temperature and support. Wool and cotton naturally wick moisture, which means you're less likely to wake up clammy than on an all-foam mattress, and the eOlus fibre layer adds a soft, foam-like feel while still letting air pass through. Beneath that, 1400 pocket springs with 8 turns each respond independently to your body, so a heavier hip can sink while a lighter shoulder stays supported. The medium firm feel suits most back and combination sleepers. It's hypoallergenic and meets the BS7177 fire safety standard. At mattressnextday.co.uk, delivery is free and next day, flat rather than rolled.
Key features & 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.
Best suited for?
Back sleepers
The medium firm feel and 1400 pocket springs give steady support under the hips and shoulders, which suits lying flat on your back.
Combination sleepers
Medium firm tension and individually responding springs mean the surface supports you in several positions, so switching through the night feels easy.
Warm sleepers
Wool and cotton wick moisture and the viscose cover helps air flow, which means you are less likely to wake up clammy.
Couples
Each pocket spring adjusts on its own, so movement on one side is less likely to disturb the other person.
Allergy sufferers
The mattress is hypoallergenic and uses natural wool and cotton fillings, which makes it a sensible pick for anyone wanting a cleaner sleep surface.
If you like a soft, sink-in feel, the medium firm tension here will likely feel too solid, and lightweight side sleepers may find it a little firm at the shoulder. Anyone who wants to try before committing should also pause: no trial period is listed by the retailer or by Hypnos.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Hypnos Wool Tranquility Mattress
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FAQ's
How firm is the Hypnos Wool Tranquility mattress?
It's rated medium firm. That tension suits most back and combination sleepers, although lightweight side sleepers may find it slightly too firm for comfortable pressure relief at the shoulders and hips.
Does the Hypnos Wool Tranquility come with a trial period?
No trial period is stated on the retailer listing, and no manufacturer trial is mentioned either. If a sleep trial matters to you, check terms directly with the retailer before ordering.
What guarantee does the Hypnos Wool Tranquility have?
It comes with a 5-year Hypnos manufacturer guarantee, as stated on the mattressnextday.co.uk listing. That's shorter than some brands offer, but it comes from an NBF-approved UK manufacturer with audited build quality.
Is the Hypnos Wool Tranquility good for hot sleepers?
It's a strong option. Wool and cotton layers naturally wick moisture, the viscose blend cover promotes airflow, and the eOlus fibre layer is designed not to retain heat or sweat, so it should sleep noticeably cooler than most foam-heavy mattresses.
How is the Hypnos Wool Tranquility delivered?
Mattressnextday.co.uk offers free next day delivery, and the mattress arrives flat rather than vacuum-rolled. That's a retailer offer, so terms may differ if it is bought elsewhere. Flat delivery means no waiting for it to expand, but do check access for larger sizes.
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