Firmness
Type
Pocket Spring
Depth (cm)
24
Number of Layers
3
Trial Period (nights)
Warranty (years)
10
Price Range
£279 to £499
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 one suits you if you want firmer, orthopaedic-style support without a premium price tag. The medium firm feel and independent pocket springs give steady support for back sleepers and heavier builds, although lightweight side sleepers may find it a little too firm at the shoulder. The turnable, double-sided construction is rarer these days and should help the mattress wear more evenly over time. Across verified owner reviews it holds a 4.7 rating from 269 reviewers on MattressNextDay. Yes, the fillings are simple polyester fibre rather than natural wool or latex, but that simplicity is exactly why the price starts at £279.00, and the hypoallergenic construction is a genuine plus for allergy sufferers.
Key Features & what's inside
- Cover. A breathable Belgian damask fabric cover, which means air can move through the sleep surface rather than getting trapped. That helps you stay a little cooler through the night.
- Comfort Fillings. Soft white fibre fillings made from 100% polyester. These give a gentle cushioned surface over the firmer springs beneath.
- Support System. 1000 pocket springs, each mounted in its own separate cotton pocket. Because the springs work completely independently, the mattress responds to your shape and reduces movement transferring across the bed.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
If you sleep on your side and weigh less, the medium firm feel may press a little hard at the hips and shoulders. Anyone wanting deep, contouring memory foam should look elsewhere, as the fillings are simple polyester fibre. It also needs turning regularly, which won't suit everyone.
Sleepeezee Diamond Ortho Mattress
Across 269 verified owner reviews on MattressNextDay, the Diamond Ortho scores 4.7, with customers praising the orthopaedic support, the turnable double-sided build with handy handles, and hypoallergenic properties that suit allergy sufferers and asthmatics.
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How firm is the Sleepeezee Diamond Ortho mattress?
It's rated medium firm. That means noticeable support with a modest layer of cushioning from the polyester fibre fillings, rather than a soft, sink-in feel. It suits back sleepers and those who prefer firmer support, although lighter side sleepers may find it slightly too firm.
Does the Sleepeezee Diamond Ortho have a guarantee?
Yes, the retailer listing states a 10-year manufacturer's guarantee from Sleepeezee. No sleep trial is mentioned on that listing, so check the returns policy with whichever retailer you buy from before ordering.
Can you flip the Sleepeezee Diamond Ortho mattress?
Yes. It has a double-sided, turnable construction with handles to make flipping easier. Turning it regularly helps the fillings settle evenly, which should keep the surface feeling consistent for longer.
What sizes does the Sleepeezee Diamond Ortho come in?
It's available in UK Single, Small Double, Double, King and Super King, with prices ranging from £279 to £499 depending on size. The mattress is 24cm deep across all sizes.
Is the Sleepeezee Diamond Ortho good for allergy sufferers?
Owner reviews highlight its hypoallergenic properties as suitable for allergy sufferers and asthmatics. The fillings are 100% polyester fibre rather than natural materials like wool, which some people with allergies prefer to avoid.
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