Firmness
Type
Pocket Spring
Depth (cm)
28
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£879 to £1,929
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.
This mattress makes sense if you want proper firm support without synthetic foams. The ReActive 7-turn pocket springs respond individually, which means your hips and shoulders get targeted support while your spine stays aligned as you shift position. The wool and cotton fillings handle temperature well: wool insulates in winter, cotton wicks moisture in summer, so hot sleepers should find it more forgiving than memory foam. The materials are credibly certified too, with Responsible Wool Standard wool and an unbleached cotton cover that's fire-resistant without chemical treatments. Yes, it starts at £879.00, which is a serious spend, but the natural build and 10-year Hypnos guarantee help justify it. Best suited to back sleepers and heavier sleepers who need a firmer feel.
Key Features & what's inside
- Cover. An unbleached cotton cover that achieves fire resistance without FR chemicals, which means a cleaner, fresher sleep surface. It feels natural rather than synthetic against your bedding.
- eOlus™ Fibres. Resilient eOlus fibres sit just beneath the cover, offering body support while letting air and moisture pass through easily. In practice, that means less heat building up around you overnight.
- RWS Certified British Wool. Layers of British wool, certified by the Responsible Wool Standard, cushion your whole body so you dip into the surface just the right amount. Wool also insulates naturally, keeping you warmer in winter.
- Sustainably Sourced Cotton. Responsibly sourced cotton wicks away excess moisture, which means the surface stays feeling fresh through the night. It works alongside the wool to regulate temperature all year round.
- ReActive™ 7-Turn Pocket Springs. A support unit of ReActive 7-turn pocket springs, each moving independently to align your spine as you change position. That translates to targeted support at your hips and shoulders rather than a one-feel-fits-all base.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
This is a firm mattress, so lightweight side sleepers may find it a little too unyielding at the shoulder and hip. If you prefer the slow, cradling sink of memory foam, the springy natural feel here won't suit you. And with prices from £879.00, budget shoppers should look elsewhere.
Hypnos Imperial Ortho Supreme Mattress
View all mattresses
How firm is the Hypnos Imperial Ortho Supreme mattress?
It's rated firm. That suits back sleepers and heavier sleepers who need solid spinal support, although lightweight side sleepers may find it a little too unforgiving at pressure points like the shoulders.
Does the Hypnos Imperial Ortho Supreme have a guarantee?
Yes, it comes with a 10-year Hypnos guarantee, which is the manufacturer's own guarantee rather than a retailer offer. No trial period is stated on the retailer listing we sourced, so check terms with your chosen retailer before buying.
Is the Hypnos Imperial Ortho Supreme good for hot sleepers?
It should cope well. The wool and cotton fillings regulate temperature naturally, the cotton wicks moisture and the eOlus fibre layer lets air pass through easily. There's no memory foam to trap heat, which is often the main culprit for sleeping hot.
What sizes does the Hypnos Imperial Ortho Supreme come in?
Nine sizes: UK Single, Small Double, Double, King, Super King and Emperor, plus EU Single, Double and King. Prices range from £879.00 to £1,929 depending on the size you choose.
How deep is the Hypnos Imperial Ortho Supreme mattress?
It's 28cm deep, so standard fitted sheets should still work, though deep-fitted sheets will give you an easier fit. It's delivered flat rather than rolled, according to MattressNextDay's listing, which also offers free next-day delivery as a retailer perk.
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