Coolflex Lux Ortho Pocket Small Double Mattress
The Coolflex Lux Ortho Pocket is an extra firm hybrid mattress, which means it pairs pocket springs with foam for a supportive, no-sink feel.
- Genuinely firm feel
- Minimises partner disturbance
- Pressure relief without deep sink
£249
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Coolflex Lux Ortho Pocket Mattress
More available sizes
Mattress details
Mattress
Coolflex Lux Ortho Pocket Mattress
Size
Firmness
Extra Firm
Construction
Foam
Pocket Spring
Hybrid
Rolled
Orthopaedic
Depth (cm)
24
Layers
3
Layer Details
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.
Key benefits
- Real width for one sleeper: At 120cm across, the UK small double is 30cm wider than the UK single, which means a solo adult can stretch out on an extra firm surface without feeling penned in.
- Fits compact double bedrooms: It is 15cm narrower than the UK double, which can be the difference between a door that clears the bed and one that doesn't in a box room or studio.
- Firm support in a smaller footprint: The extra firm pocket spring build keeps its no-sink feel at this size, so downsizing your room doesn't mean settling for a softer mattress.
- Copes with occasional couple use: The pocket springs respond to each sleeper independently, so a couple sharing a guest room for a weekend won't roll into each other, even at 4ft wide.
- Modest room requirement: We suggest a room of at least 2.4m x 2.8m for this size, which brings a proper adult bed within reach of loft conversions and small second bedrooms.
This size suits you if...
You sleep alone, like a firm bed and want more width than a UK single without giving your room over to a full double. Or you're furnishing a small guest room, rental or loft conversion where a 4ft frame leaves walking space a standard double would swallow, and any couples staying will do so occasionally rather than nightly.
Consider another size if...
You share the bed every night, because 120cm is tight for two firm-mattress sleepers long term. We'd recommend the UK double instead, which is 15cm wider and needs a room of at least 2.6m x 2.8m.
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FAQ's
Is a small double Coolflex Lux Ortho Pocket big enough for a couple?
For occasional nights, yes. The pocket springs react to each person independently, so movement on one side is less likely to travel across, which helps on a 120cm width. For every night, two adults will feel the squeeze, and the UK double, 15cm wider, is the better long-term choice.
What room size do I need for a small double mattress?
We suggest a room of at least 2.4m x 2.8m for the UK small double. That allows space to walk around and open drawers rather than simply squeezing the bed in. If your room comfortably exceeds 2.6m x 2.8m, the UK double becomes an option too.
Is the small double a good upgrade from a UK single?
Often, yes. The UK small double is 30cm wider than the UK single and the same length, so a teenager or adult who has outgrown a single gains real shoulder room without the bed dominating the floor. The extra firm feel suits back and front sleepers making that move.
Does the extra firm feel work at this size?
The construction is the same across every size: pocket springs beneath Reflex Foam, with a breathable knitted cover. What changes at 120cm wide is context. A solo sleeper gets the full firm surface to themselves, while a couple on a firm mattress this narrow has little room to shift position.
What bedding fits the Coolflex Lux Ortho Pocket small double?
You'll need small double, or 4ft, fitted sheets to match its 120 x 190cm footprint. It's a standard UK size, so sheets and frames are easy to find. Standard double sheets will bag slightly at the sides, so it's a fit worth getting right on a taut, extra firm surface.