Sealy Ortho Plus Essential 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
£299
Get the lowest price we've found
The Sealy Ortho Plus Essential's PostureTech CS spring system, an open coil design, responds to your body weight to give deep down support, which means a firmer, more traditional feel than foam-heavy models. At 27cm deep with a breathable Belgian damask cover and polyester fibre fillings, it keeps things simple rather than layered with memory foam. That makes it a sensible pick if you want straightforward orthopaedic-style support on a budget, although lightweight side sleepers may find it a little too firm. Sealy is an NBF-approved manufacturer, and the mattress meets the BS7177: 2008 fire safety standard.
Mattress specifications
Firmness
Medium Firm
Type
Open Coil Spring
Depth (cm)
27
Number of Layers
3
Trial Period (nights)
Warranty (years)
5
Price Range
£299 to £519
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose this if you want firm-leaning support without a premium price. The twice-tempered springs are built to keep their resilience over time, which means the mattress should hold its shape rather than developing dips early on. The breathable damask cover helps air move through the sleep surface, useful if you tend to run warm. It comes in five sizes from UK Single to UK Super King. MattressNextDay states a 5-year guarantee and free next day delivery to mainland UK, though some addresses may incur a small fee. Yes, the fillings are simple polyester fibre rather than natural materials, but that simplicity is a large part of why it has an affordable starting price.
Key features & 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.
Best suited for?
Budget buyers
The simple polyester fibre fillings and open coil springs keep things uncomplicated, which is a large part of why this mattress has an affordable starting price.
Back sleepers
PostureTech CS springs respond to your body weight to give deep down support, which means a firmer, more traditional feel under your hips and shoulders.
Heavier sleepers
Twice-tempered steel springs are built to stay resilient over time, so the mattress should hold its shape rather than developing dips early on.
Warm sleepers
The breathable Belgian damask cover helps air move through the sleep surface, so heat is less likely to get trapped against you overnight.
Guest rooms
Five sizes from UK Single to UK Super King and a simple three-layer build make it easy to fit out a spare room sensibly.
If you like a soft, cradling surface or sleep mainly on your side with a lighter build, this medium firm feel may press a little too hard on shoulders and hips. It's also an open coil design, so couples who move at different times may notice more motion transfer than with pocket springs.
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.
Sealy Ortho Plus Essential Mattress
Select a comparison article below or choose to compare this mattress side by side with up to 2 other mattresses.
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
How firm is the Sealy Ortho Plus Essential mattress?
It's listed as medium firm. Some owners report it feels firmer than expected, so treat it as sitting at the firmer end of medium firm. That's helpful for back sleepers wanting spinal support, but lighter side sleepers may find it a little unforgiving.
What springs does the Sealy Ortho Plus Essential use?
It uses Sealy's PostureTech CS springs, an open coil system made from high tensile steel. The retailer page describes the same system as both 'Open Coil Springs' and 'PostureTech CS Springs'. The springs respond to your body weight for deep down support and are twice tempered for durability.
How deep is the Sealy Ortho Plus Essential mattress?
It's 27cm deep, a fairly standard depth that most fitted sheets will cover comfortably.
Does the Sealy Ortho Plus Essential come with a guarantee?
MattressNextDay states a 5-year guarantee. As that's stated on a retailer page rather than Sealy's own site, check the terms at your point of purchase before buying.
What sizes does the Sealy Ortho Plus Essential come in?
Five UK sizes: Single, Small Double, Double, King and Super King.
Couldn't find an answer to your question? Send us a message