Firmness
Extra Firm
Type
Hybrid
Depth (cm)
24
Number of Layers
3
Trial Period (nights)
Warranty (years)
5
Price Range
£199 to £349
Best Sleeping Position(s)
Certifications
Assessed from Coolflex's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
The main draw here is genuine firmness at a modest price. The pocket springs work independently, which means the mattress adapts to your weight and movement rather than moving as one slab, so a restless partner is less likely to disturb you. Above the springs, Reflex Foam contours to your shape for pressure relief without the deep sink of an all-foam bed. The knitted cover is breathable, helpful if you tend to run warm at night. It is also hypoallergenic, vegan friendly and certified fire resistant to the BS7177: 2008 standard for domestic use. Yes, the 5-year guarantee is shorter than some brands offer, but at £199 to £349 the value case is strong.
Key Features & what's inside
- Knitted Cover. A soft knitted cover that breathes well, which means heat can escape rather than build up around you. It helps keep you at an even temperature all night.
- Reflex Foam. A soft layer of Reflex Foam that contours to the shape of your body, which means personalised support and pressure relief where you need it. It gives a comfortable surface without undermining the firm feel beneath.
- Pocket Springs. Individual pocket springs work independently, reacting to changes in your weight and movement. In practice that means responsive support at your pressure points and less motion transfer across the bed.
Layer details from mattressnextday.co.uk product page, September 2026.
Who's it NOT for?
This is an extra firm mattress, so it is not the one for lightweight sleepers or dedicated side sleepers who need their shoulder and hip to sink in. If you prefer a soft, cradling, hug-you-in feel, an all-foam or medium mattress will suit you far better.
Coolflex Lux Ortho Pocket Mattress
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How firm is the Coolflex Lux Ortho Pocket mattress?
It is rated extra firm, the firmest end of the scale. Expect a supportive, flat sleeping surface with very little sink, which tends to suit back and front sleepers and heavier builds rather than lightweight side sleepers.
How deep is the Coolflex Lux Ortho Pocket mattress?
It is 24cm deep, a fairly standard depth that should fit most fitted sheets without any trouble.
What sizes does the Coolflex Lux Ortho Pocket come in?
Five sizes: UK Single, UK Small Double, UK Double, UK King and UK Super King. Prices run from £199 to £349 depending on the size you choose.
Does the Coolflex Lux Ortho Pocket have a guarantee?
Yes, it comes with a 5-year guarantee. That is shorter than some brands offer, but reasonable for a mattress at this price point.
Is the Coolflex Lux Ortho Pocket good for allergy sufferers?
It is certified hypoallergenic, which makes it a sensible choice if you are prone to allergies. It is also vegan friendly and meets the BS7177: 2008 fire resistance standard for domestic use.
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