Sealy Advantage Memory Essential Mattress
The Sealy Advantage Memory Essential pairs a MemorySense memory foam comfort layer with PostureTech Core Support Springs, which means you get that slow-sinking foam feel with a bit more bounce and support underneath than an all-foam design.
- Eases pressure at shoulders & hips
- Suits back & stomach sleepers
- Spring core lets air flow through
£325
Get the lowest price we've found
The Sealy Advantage Memory Essential is described by Sealy as medium to firm, and at 27cm deep it's a reasonably substantial hybrid. It comes in five UK sizes, single up to super king, and sits at the affordable end for a memory foam hybrid from a National Bed Federation approved brand. It's handcrafted in the UK and holds a 4.7 rating from 412 reviews on the Mattress Online product page.
Mattress specifications
Firmness
Medium Firm
Type
Memory Foam
Depth (cm)
27
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£325 to £569
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you like memory foam's pressure relief but worry about feeling stuck or sleeping hot on solid foam, the spring core here is the appeal: the MemorySense layer cushions your shoulders and hips while the PostureTech springs keep your spine supported and let air move through the mattress. The medium to firm feel suits back and stomach sleepers well, although lightweight side sleepers may find it slightly too firm. It's a simple two-layer build, but that simplicity keeps the price reasonable. Buying through Mattress Online adds free delivery to most UK locations with a two-hour time slot, and a 100-night trial if you buy a mattress protector with it.
Key features & layer details
Comfort Layer
A layer of MemorySense memory foam sits on top, which means it moulds to your body shape and eases pressure on your shoulders and hips. It gives you that gentle cradling feel memory foam is known for.
Support System
Beneath the foam, PostureTech Core Support Springs do the structural work, keeping your spine aligned and adding responsiveness so you don't feel stuck when changing position. The springs also allow more airflow than a solid foam base.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Back sleepers
The medium to firm feel, backed by PostureTech springs under the foam, keeps your spine supported while the memory foam eases pressure on your shoulders and hips.
Front sleepers
Medium to firm tension stops your hips sinking too far, and the spspring core underneath gives a level, supportive surface when you lie on your stomach.
Warm sleepers
The spring core allows more airflow than a solid foam base, so heat can move through the mattress instead of building up under you.
Combination sleepers
Responsive PostureTech springs under the memory foam mean you don't feel stuck when changing position, which helps if you turn over a lot in the night.
Budget buyers
A simple two-layer build keeps the cost reasonable, giving you a memory foam hybrid from a National Bed Federation approved brand at the affordable end.
If you share a bed and are easily disturbed, springs can transmit a little more movement than all-foam designs, and one owner review mentioned motion transfer. Those wanting a genuinely firm, orthopaedic-style feel should look elsewhere too, as some owners found it softer than expected. And if you dislike memory foam's hug, this isn't for you.
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 Advantage Memory 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 Advantage Memory Essential mattress?
Sealy describes it as medium to firm, so it sits towards the supportive end without being hard. Some owners report it feels a little softer than expected, which is common with memory foam as it warms to your body. Back and stomach sleepers should find it comfortable; very light side sleepers may find it slightly too firm.
Does the Sealy Advantage Memory Essential come with a trial period?
Mattress Online lists a 100-night comfort trial, though it requires you to buy a mattress protector from them at the same time. That's the retailer's own offer rather than a Sealy guarantee, so terms will differ if you buy elsewhere.
How deep is the Sealy Advantage Memory Essential mattress?
It's 27cm deep, made up of a MemorySense memory foam comfort layer over PostureTech Core Support Springs, finished with a knitted cover. That depth suits standard fitted sheets and gives a reasonably substantial feel for the price.
What guarantee does the Sealy Advantage Memory Essential have?
Mattress Online lists a 5-year guarantee on this mattress. It's the retailer's listed term rather than a stated manufacturer promise, so check the guarantee offered wherever you buy.
What sizes does the Sealy Advantage Memory Essential come in?
Five UK sizes: single, small double, double, king and super king. It's handcrafted in the UK and conforms to BS7177: 2008 fire resistance standards.
Couldn't find an answer to your question? Send us a message