Mattress Online Classic Gold Ortho Small Double Mattress
The Classic Gold Ortho is Mattress Online's entry-level orthopaedic model, built around traditional open coil springs with a soft fibre comfort layer on top.
- Helps keep your spine aligned
- Breathable cover for warm sleepers
- 100-night trial
£208
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Mattress Online Classic Gold Ortho Mattress
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Mattress details
Mattress
Mattress Online Classic Gold Ortho Mattress
Size
Firmness
Medium Firm
Construction
Orthopaedic
Open Coil Spring
Depth (cm)
26
Layers
3
Layer Details
Comfort Layer
Soft white synthetic fibres sit at the top, which means a cosy initial feel rather than a firm, flat surface. They're durable and resilient, designed to hold their shape over time.
Support System
Traditional open coil springs are interlaced and joined in a lattice design, which means your weight is distributed evenly across the bed. That helps relieve built-up pressure and supports spinal alignment, the core job of an orthopaedic mattress.
Cover
A knitted cover gives a soft, warm finish. It also enhances airflow and is breathable, which helps if you run a little hot at night.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Room to sprawl on your own: The UK small double is 30cm wider than the UK single, which means a solo sleeper can stretch, turn and starfish without an elbow off the edge.
- Fits compact double bedrooms: At 15cm narrower than the UK double, it can leave walkable floor space in a box room or studio where a bigger frame would block the door.
- Firmer support in a smaller footprint: The medium firm open coil build spreads your weight evenly, so you get orthopaedic-style support without needing a full-sized double room to house it.
- Sensible for occasional sharing: Two guests can share a UK small double for the odd night, which makes it a practical fit for a spare room that mostly sits empty.
- Easy bedding to find: 4ft is a standard UK size, so small double fitted sheets are widely stocked and a standard double duvet drapes comfortably over it.
This size suits you if...
You sleep alone and have outgrown a single but your room cannot take a full double, you're kitting out a loft conversion or box room where every centimetre of floor matters, or you need a guest bed that copes with occasional couples. The firmer feel also suits a teenager moving up from a single who wants proper back support.
Consider another size if...
You share the bed every night, because open coils transfer movement and 120cm is snug for two 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 Classic Gold Ortho big enough for a couple?
For occasional nights, yes. Two adults can share a UK small double for a weekend stay, which is why it works well in guest rooms. Every night is a different matter: the open coil springs transfer more movement than pocket springs, and the width leaves little personal space. Regular sharers would be happier on the UK double, which gives 67.5cm each.
What room size do I need for a small double mattress?
We suggest a room of at least 2.4m x 2.8m for a UK small double. That allows space to walk round the bed and open drawers or a wardrobe. If your room is smaller than that, a UK single needs at least 2.1m x 2.8m and shares the same 190cm length, so bed position stays the same.
How much wider is a small double than a single?
The UK small double is 30cm wider than the UK single, and the two are exactly the same length at 190cm. That extra width is the whole point of the size: a solo sleeper gains real spreading room without the bed growing any longer, useful when the headboard wall is fixed and floor space is tight.
Will this size fit a loft conversion or box room?
Often, yes. At 120cm wide, the UK small double is 15cm narrower than a standard double, and that margin can be the difference between the door clearing and standing room beside the bed. Measure your usable floor first: we suggest at least 2.4m x 2.8m, and check sloping ceilings leave headroom where you'd actually sit up.
What bedding fits the small double Classic Gold Ortho?
You'll need small double (4ft) fitted sheets to get a snug fit over the 120 x 190cm mattress; double sheets will bag at the corners. For the top layer, a standard double duvet drapes nicely with a little overhang each side. 4ft is a standard UK size, so sheets and frames are easy to come by.