Firmness
Type
Pocket Spring
Depth (cm)
27
Number of Layers
4
Trial Period (nights)
Warranty (years)
5
Price Range
£549 to £1,249
Best Sleeping Position(s)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
The main appeal here is the spring system. Hypnos's ReActive 6-turn pocket springs move independently, which means each part of your body gets support where it needs it rather than a one-size response across the whole surface. Above the springs sit eOlus fibres and Solotex, a recycled fibre that's fully breathable, so air and moisture move through the mattress rather than building up. If you're a hot sleeper who has been put off by foam, that's a genuine point in its favour. The medium firm feel suits most back and combination sleepers, although lightweight side sleepers may find it a little too firm. It's delivered flat, not rolled, so the springs arrive uncompressed.
Key Features & what's inside
- 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. It's the first line of temperature control before you reach the comfort fibres beneath.
- Solotex™. Solotex is a recycled fibre that's fully breathable. It adds a softer touch near the surface without trapping heat the way some foams can.
- eOlus™ Fibres. These fibres are designed to offer resilient body support while letting air and moisture pass through easily. In practice that means cushioning that recovers its shape rather than compacting over time.
- ReActive™ 6-Turn Pocket Springs. Hypnos's ReActive 6-turn pocket spring system provides spinal and body support, with each spring sensing and responding to your weight independently. That independence also helps limit movement transferring across the bed if you share it.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
If you love the slow, sinking hug of memory foam, this fibre-and-spring build will feel too springy. Lightweight side sleepers may find medium firm a little unyielding at the shoulder and hip. And at 27cm, it's shallower than some deep divan-style mattresses, so very deep fitted sheets may bag slightly.
Hypnos Zen Mattress
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How firm is the Hypnos Zen mattress?
It's a medium firm mattress. That suits most back and combination sleepers, although lightweight side sleepers may find it slightly too firm at the shoulder and hip.
Does the Hypnos Zen mattress have a guarantee?
The MattressNextDay listing states a Hypnos 5-year guarantee. As this appears on a retailer's page, it's sensible to confirm the guarantee terms with the manufacturer or your chosen retailer before buying.
Is the Hypnos Zen mattress good for hot sleepers?
It's a reasonable choice. The build avoids foam entirely, using a breathable viscose blend cover, Solotex recycled fibre and eOlus fibres that let air and moisture pass through, so heat is less likely to build up than with memory foam.
What sizes does the Hypnos Zen come in?
It's available in UK small single, single, small double, double, king, super king and emperor, plus EU single, double and king. Prices run from £549 to £1,249 depending on size.
Is the Hypnos Zen delivered rolled or flat?
It's delivered flat, so the pocket springs arrive uncompressed. MattressNextDay offers free next day delivery on this mattress, though delivery terms are the retailer's own and may differ if you buy elsewhere.
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