Coolflex Essentials Pocket Mattress
The Coolflex Essentials Pocket Mattress is an entry-level hybrid, pairing an 800 pocket spring unit with a soft Reflex foam comfort layer under a knitted cover.
- Minimises partner disturbance
- Support that adjusts to your shape
- Cushions shoulders & hips
£149
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Coolflex describes the Essentials Pocket Mattress as medium, which means a balanced feel rather than anything firm or plush. At 24cm deep it's slimmer than some hybrids, though standard fitted sheets will fit without fuss. Worth knowing: Coolflex is MattressNextDay's own-brand line, so you're buying direct from the retailer, with free next day delivery, a 100 night trial and a 5 year guarantee. It arrives vacuum-sealed and expands within 24 hours of unpacking.
Mattress specifications
Firmness
Medium Firm
Type
Hybrid
Depth (cm)
24
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
5
Price Range
£149 to £269
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
Assessed from Coolflex's published specification for this mattress, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This is a sensible pick if you want proper pocket springs at a budget price. The 800 springs work independently, which means less disturbance when a partner moves and support that adjusts to your shape rather than pushing back evenly across the bed. The soft Reflex foam layer above adds cushioning at the surface, and the medium feel suits most sleeping positions without committing you to firm or soft. Yes, it's a simpler build than pricier hybrids, but the 100 night trial and 5 year guarantee give you a fair safety net. It's single-sided, so you rotate it rather than flip it. Available in five UK sizes from Single to Super King.
Key features & layer details
Knitted cover
A super-soft knitted cover with a touch of breathability, which means a gentler first impression when you lie down and a little help letting warm air escape.
Soft foam comfort layer
A layer of soft Reflex foam sits beneath the cover, cushioning shoulders and hips. It softens the feel of the springs below without making the mattress feel plush overall.
800 pocket spring unit
Pressure-reactive springs work independently, which means support tailored to where your body needs it and virtually no motion transfer across the bed. If you share, you should feel far less of your partner's movement.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Couples
The 800 independently working pocket springs mean virtually no motion transfer, so you should feel far less of your partner's movement during the night.
Budget buyers
Proper pocket springs, a soft foam layer and a 5 year guarantee come in a simpler build that the copy pitches at a budget price.
Combination sleepers
A medium feel that suits most sleeping positions means you can change position through the night without it feeling too firm or too soft.
Side sleepers
The soft Reflex foam layer cushions shoulders and hips, while the springs below adjust to your shape, giving pressure points a gentler surface to settle into.
Guest rooms
A medium feel that suits most sleeping positions, plus a vacuum-sealed delivery that expands within 24 hours, makes it an easy choice for a spare bed.
Skip this one if you prefer a firm mattress, since the medium feel and soft foam layer will likely feel too giving. Heavier sleepers wanting deep, substantial support may also find the 24cm profile and simpler build a little basic. And if you like a flippable mattress, this is single-sided.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Coolflex Essentials Pocket Mattress
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FAQ's
How firm is the Coolflex Essentials Pocket Mattress?
Coolflex describes it as medium. In practice that means a balanced feel: the soft Reflex foam layer cushions you at the surface, while the 800 pocket springs provide support underneath. It suits most sleepers, although anyone who prefers a distinctly firm surface may find it a little soft.
Does the Coolflex Essentials mattress come with a trial?
Yes, it comes with a 100 night trial and a 5 year guarantee. That gives you a few months to sleep on it at home before committing, which is a reasonable safety net for a budget-priced mattress.
How long does the Coolflex Essentials take to expand?
It arrives vacuum-sealed and rolled, and expands within 24 hours of unpacking. You can sleep on it sooner if it looks fully expanded, but allowing the full day is the safer bet.
Can you flip the Coolflex Essentials Pocket Mattress?
No, it's single-sided, so it isn't designed to be flipped. Rotating it head to toe now and then helps the comfort layers wear evenly instead.
What sizes does the Coolflex Essentials come in?
It's available in UK Single, Small Double, Double, King and Super King. All sizes are 24cm deep, with free next day delivery from MattressNextDay.
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