Sealy Ortho Plus Essential Mattress
Mattress
Sealy Ortho Plus Essential Mattress
Size
Firmness
Construction
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.
- 90cm each, every night: Two people sharing get 90cm of width apiece, which means a genuinely restless partner becomes far easier to sleep through.
- Distance beats motion transfer: Open coil springs pass on more movement than pocket springs, but at this width you're simply further from the disturbance, which softens that drawback considerably.
- Room for the whole household: When a child pads in at 3am, or the dog treats the bed as home, 180cm of width means everyone still gets a fair share.
- Firm support across the full width: The PostureTech CS springs respond to body weight wherever you lie, so two sleepers of different builds each get support where they need it.
- Breathable at scale: The Belgian damask cover lets air move through a large sleep surface, helpful when three or four bodies raise the temperature under one duvet.
- A big bed without a big spend: Super king mattresses often carry premium construction and premium pricing, while this one keeps things simple with polyester fibre fillings and sturdy springs.
This size suits you if...
You share every night and want the most space a standard UK size offers, your partner turns frequently and you'd rather have distance than earplugs, or children and pets regularly join you and a UK king has started to feel crowded. It also suits larger master bedrooms, where a smaller mattress can look a little lost against the wall.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest for a UK super king, or you sleep alone. We'd recommend the UK king instead: it's 30cm narrower, the same length, and we suggest at least 2.7m x 2.9m for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
Is the Sealy Ortho Plus Essential super king big enough for co-sleeping with children?
It's the roomiest option in the range at 180 x 200cm, or 6ft x 6ft 6in. Two adults get 90cm each, so when a child climbs in there's still usable space for everyone. The medium firm feel also keeps the surface stable rather than rolling everyone towards the middle.
Will an open coil mattress disturb my partner in a super king?
Open coil designs like this one do transfer more motion than pocket springs, so a restless sleeper is noticeable. The super king helps more than any comfort layer would: with 90cm of width each, most movement happens too far away to wake you. Light sleepers next to very restless partners may still prefer pocket springs.
What room size do I need for the Sealy Ortho Plus Essential in a super king?
We suggest at least 3m x 2.9m, which is our own guidance rather than Sealy's. That allows walking space and bedside tables on both sides. Measure the door swing and any landing turns before ordering too; at 180cm wide, this is the size where staircases start to cause problems.
Is the super king worth it over the king for this mattress?
The UK super king is 30cm wider than the UK king and the same length, so the entire gain goes into elbow room. If you share with a restless partner, children or a large dog, that extra width is the difference between coping and sleeping well. Solo sleepers or those in smaller rooms won't feel the benefit.
Where can I buy the Sealy Ortho Plus Essential in a super king?
Compare the retailers listed on this page. The prices shown are updated as retailers change them, so what you see here reflects current availability for the UK super king rather than a snapshot that may have gone stale.