Firmness
Type
Pocket Spring
Depth (cm)
26
Number of Layers
3
Trial Period (nights)
Warranty (years)
10
Price Range
£529 to £1,299
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.
Choose this if you want a properly firm mattress from an established British maker without the usual Hypnos price tag. The ReActive 6-turn pocket springs sense comfort and support requirements individually, which means better spinal alignment for back and front sleepers who need a solid base. The cotton fillings help regulate temperature, useful if you tend to sleep warm, and the chemical-free viscose cover is breathable rather than clammy. Sizing is unusually generous, running from a UK Small Single up to an Emperor, plus EU sizes, so awkward bed frames are catered for. The manufacturer's 10-year guarantee adds reassurance, and Mattress Next Day, the retailer listing it, offers free next day delivery.
Key Features & what's inside
- Cover. A 100% viscose, chemical-free cover that feels silky against the skin. It's breathable too, which helps air move away from your body overnight.
- Comfort fillings. Natural cotton is combined with Solotex, a recycled fibre. The cotton regulates temperature while the Solotex adds resilience, so the comfort layer keeps its shape rather than flattening quickly.
- Support system. Hypnos's ReActive 6-turn pocket spring system, engineered for total spinal and body support. Each spring works independently, sensing your comfort and support requirements, which means less roll-together and more even pressure relief.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
This is an extra firm mattress, so lightweight sleepers and dedicated side sleepers may find it too unyielding, with not enough give at the shoulder and hip. If you like a cushioned, sink-in feel, look elsewhere. The listing also gives no trial period, so you'll want to be confident in your choice before ordering.
Hypnos Ultimate Ortho Mattress
Across 56 verified reviews on Mattress Next Day's product page, the Ultimate Ortho holds a full 5-star rating.
View all mattresses
How firm is the Hypnos Ultimate Ortho mattress?
It's rated extra firm, the most solid end of the scale. That suits heavier builds and back or front sleepers who want strong spinal support, although lightweight side sleepers will likely find it too hard for comfortable pressure relief at the shoulders and hips.
Does the Hypnos Ultimate Ortho have a guarantee?
Yes, it comes with a Hypnos 10-year guarantee from the manufacturer, as stated on the Mattress Next Day listing. Note that the free next day delivery and old mattress removal are that retailer's own offers rather than Hypnos services.
How many springs are in the Hypnos Ultimate Ortho?
The listing doesn't give a spring count. What it does confirm is the support system: Hypnos's ReActive 6-turn pocket springs, where each spring moves independently to respond to your body, giving even support and reducing motion transfer between partners.
What sizes does the Hypnos Ultimate Ortho come in?
The range is broad: UK Small Single, Single, Small Double, Double, King, Super King and Emperor, plus EU Single, EU Double and EU King. Prices run from £529.00 to £1,299 depending on the size you choose.
Is the Hypnos Ultimate Ortho good for hot sleepers?
It should cope reasonably well. The fillings are natural cotton, which regulates temperature, and the 100% viscose cover is breathable. There's no memory foam layer listed, which is often the culprit for heat retention, so warm sleepers have less to worry about here.
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