Sealy Ortho Plus Essential Small Double Mattress
The Sealy Ortho Plus Essential is a medium firm sprung mattress from a long-established brand.
- Firm-leaning support
- Twice-tempered springs resist dipping
- Damask cover lets air move through
£369
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Sealy Ortho Plus Essential Mattress
More available sizes
Mattress details
Mattress
Sealy Ortho Plus Essential Mattress
Size
Firmness
Medium Firm
Construction
Foam
Memory Foam
Orthopaedic
Open Coil Spring
Depth (cm)
27
Layers
3
Layer Details
Damask Cover
A cover made from breathable Belgian damask fabric, which means air can move through the sleep surface rather than getting trapped against you. It gives a traditional, tailored finish.
Soft White Fibres
Soft fibre fillings made from 100% polyester sit above the springs. They add a slightly softer initial feel before you reach the firmer support beneath.
PostureTech CS Springs
These springs respond to your body weight to provide deep down support, so heavier areas like hips and shoulders get pushed back where needed. They are twice tempered, which means the steel is treated to stay resilient over time.
Layer details from mattressnextday.co.uk product page, September 2026.
Key benefits
- Real space for one sleeper: At 120cm wide, the UK small double is 30cm wider than the UK single, which means a solo adult can change position freely without meeting the edge.
- Firm support in a compact footprint: The PostureTech CS springs push back against heavier areas like hips and shoulders, so you get proper orthopaedic-style support even in a size built for smaller rooms.
- Fits rooms a double cannot: Being 15cm narrower than the UK double, it slots into box rooms, loft conversions and studio flats while still feeling like a proper bed.
- Airflow where space is tight: The breathable Belgian damask cover lets air move through the surface, helpful in smaller rooms where warm air tends to linger overnight.
- Easy to kit out: 4ft is a standard UK size, so small double fitted sheets and frames are straightforward to find rather than a specialist order.
This size suits you if...
You're a solo sleeper who has outgrown a single and wants a firmer, traditional feel with room to stretch, your bedroom or loft conversion can't take a full double without losing walking space, or you're furnishing a guest room where couples stay occasionally rather than every night. Allow at least 2.4m x 2.8m of floor space and the UK small double sits comfortably.
Consider another size if...
You share the bed every night, especially since this open coil design transfers more movement between partners than pocket springs would. If your room measures at least 2.6m x 2.8m, we'd recommend the UK double instead for the extra 15cm of width.
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FAQ's
Is the Sealy Ortho Plus Essential small double big enough for a couple?
For occasional nights, yes. For every night, it's a squeeze at 120cm wide, and the open coil springs mean you'll feel a partner's movements more than you would on pocket springs. Couples sharing nightly would be better served by the UK double, which is 15cm wider, or the UK king, which adds 30cm of width and 10cm of length.
What room size do I need for a UK small double mattress?
We suggest allowing at least 2.4m x 2.8m. That leaves enough space to walk around the bed and open drawers or a wardrobe without shuffling sideways. If your room is smaller than that, the UK single needs at least 2.1m x 2.8m by our guidance and may be the more liveable choice.
Should I choose the small double or the double Sealy Ortho Plus Essential?
It comes down to who sleeps in it and what the room allows. The UK small double is 15cm narrower than the UK double, the same length, and suits a solo sleeper or a compact room. Sharing nightly? Take the UK double if you can fit it: we suggest at least 2.6m x 2.8m of room space for that size.
How much more space does the small double give than a single?
The UK small double is 30cm wider than the UK single, and the two are the same length at 190cm. That extra width is the difference between sleeping in one fixed position and being able to spread out, which matters on a firmer mattress like this where you sit more on the surface than in it.
How do I find the best price on the Sealy Ortho Plus Essential in a small double?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so what you see reflects current listings rather than a snapshot. Sizes are often discounted at different rates, so a deal on the UK double won't necessarily apply to the UK small double.