Sealy Serenity Mattress
The Sealy Serenity is a firm mattress built around Sealy's AlignSupport® spring system, an open-coil design exclusive to the brand, topped with foam comfort layers.
- Firm feel for back & front sleepers
- Stable, evenly sprung support
- Foam layers soften the surface
£1,155.15
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The Sealy Serenity comes in four UK sizes from Single to Super King. Its firm feel suits back and front sleepers who want a supportive, no-sink surface, although lightweight side sleepers may find it a little unforgiving around the shoulders and hips. Buy through Mattressman and you get a 60-night trial and free next day delivery, though bear in mind those are the retailer's own terms rather than Sealy's.
Mattress specifications
Firmness
Firm
Type
Open Coil Spring
Depth (cm)
Number of Layers
2
Trial Period (nights)
60
Warranty (years)
Price Range
£1,155 to £1,858
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from the specification published by Mattress Man, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose the Serenity if you want a traditional firm mattress from an established name. The AlignSupport® open-coil spring system, which is exclusive to Sealy, provides the core support, which means a stable, evenly sprung feel rather than the contouring hug of an all-foam bed. The foam layers above soften the surface without undermining that firmness. It sits at the pricier end for an open-coil design, but you are paying for Sealy's engineering and a build intended to hold its shape. If you sleep on your back or front and like a bed that pushes back, this is a sensible shortlist candidate.
Key features & layer details
Foam layers
Foam comfort layers sit above the springs, which means a slightly cushioned surface feel over the firm support beneath. They complement rather than mask the spring system below.
AlignSupport® spring system
An open-coil spring system exclusive to Sealy that forms the mattress's supportive core. Open coils give a springy, connected feel across the whole surface, keeping you supported rather than cradled.
Layer details from mattressman.co.uk product page, September 2026.
Best suited for?
Back sleepers
The firm AlignSupport® open-coil spring system gives a stable, evenly sprung surface, which means a supportive, no-sink feel when you lie on your back.
Front sleepers
A firm surface with only a slightly cushioned foam layer on top keeps your body from sinking in, which suits lying face down.
Heavier sleepers
Open coils forming the supportive core push back against your weight, so the firm feel and sprung support should hold you up rather than let you sink.
This is a firm mattress, so lightweight side sleepers may find it too hard on the shoulders and hips. If you prefer a plush, enveloping feel, or you want the motion isolation of pocket springs or memory foam, an open-coil design like this is unlikely to suit 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 Serenity Mattress
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FAQ's
How firm is the Sealy Serenity mattress?
It is rated firm. That means a supportive surface with minimal sink, which tends to suit back and front sleepers, or anyone who finds softer mattresses leave them feeling stuck. Lighter side sleepers may want something with more give.
What is the Sealy Serenity mattress made of?
It combines foam comfort layers with Sealy's AlignSupport® spring system, an open-coil design exclusive to the brand. The springs provide the firm support while the foam adds a little surface comfort.
Does the Sealy Serenity come with a sleep trial?
Mattressman lists a 60-night trial with this mattress. That is the retailer's own offer rather than a Sealy guarantee, so check the terms if you plan to buy elsewhere.
What sizes does the Sealy Serenity come in?
It is available in UK Single, Double, King and Super King.
How quickly can the Sealy Serenity be delivered?
Mattressman offers free next day delivery on this mattress, with a handling time of 0 to 1 day and transit of 1 to 3 days. These are the retailer's delivery terms, so timings may differ if you buy from another shop.
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