Sealy Posture Balance Mattress
The Sealy Posture Balance comes in five UK sizes, from Single up to Super King.
- Firm feel with cushioned comfort
- Open-cell foam for breathability
- Hypoallergenic fibre fillings
£643.50
Get the lowest price we've found
Detailed specifications for the Sealy Posture Balance aren't published yet, so its construction and feel can't be described here. If you're weighing it up, it may be worth checking the retailer listing directly for firmness and materials before you commit.
Mattress specifications
Firmness
Firm
Type
Open Coil Spring
Depth (cm)
Number of Layers
3
Trial Period (nights)
Warranty (years)
Price Range
£643 to £957
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Certifications
Assessed from mattress data provided by our UK retail partners, captured September 2026, and from regular price comparison across those retailers.
Why should you choose this mattress?
The Sealy Posture Balance is a firmer mattress, so it suits sleepers who like a supportive, less sinky feel, although lighter side sleepers may find it a little unforgiving. PostureTech 2.0 pocket springs with higher gauge wire form the core, with a double layer of OptiForm firm foam above that cushions and adapts to your body. MicroCell foam has an open-cell structure for better breathability, and EdgeGuard reinforcement supports the sides. The construction is glue-free, and the fillings are hypoallergenic polyester fibre and TCPP-free foams. It is one-sided, so you won't need to flip it.
Key features & layer details
PostureTech 2.0 pocket springs
Pocket springs made with higher gauge wire sit at the heart of this firmer design. They give the mattress its supportive base feel, which suits sleepers who like a firm, steady surface.
MicroCell
An open-cell foam that is durable and resilient, with a soft feel. The open structure helps air move through, so it should sleep less warm than a dense foam.
OptiForm firm foam
A double layer of firm foam that gently cushions and adapts to your body. It adds some give on top of the firm feel, so the surface isn't hard.
Layer details from mattressman.co.uk product page, October 2026.
Best suited for?
Back sleepers
PostureTech 2.0 pocket springs with higher gauge wire give a supportive, steady base, which suits anyone who likes a firm, less sinky surface.
Warm sleepers
MicroCell foam has an open-cell structure that helps air move through the mattress, so it should sleep less warm than a dense foam.
Allergy sufferers
The fillings are hypoallergenic polyester fibre and TCPP-free foams, and the construction is glue-free, which suits buyers who want a cleaner-minded build.
Combination sleepers
A double layer of OptiForm firm foam adapts to your body and adds some give, so the firm surface still feels comfortable when you shift position.
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 Posture Balance Mattress
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FAQ's
How much does the Sealy Posture Balance mattress cost?
It depends on the size you choose, and the price table on this page shows the current price for each size. As with most mattresses, the larger sizes sit at the upper end of the price range.
What sizes does the Sealy Posture Balance come in?
It's available in five UK sizes: Single, Small Double, Double, King and Super King. That covers the standard UK bed frame sizes, though you should measure your frame before ordering.
Where can I buy the Sealy Posture Balance mattress?
Compare the retailers listed in the price table on this page for the current prices. Check the live listing for stock, delivery terms and any returns or trial policy, as these are set by the retailer.
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