Firmness
Medium Firm
Type
Memory Foam
Depth (cm)
31
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
5
Price Range
£775 to £1,385
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Choose this if you like the pressure relief of memory foam but worry about feeling stuck. The MemorySense top layer contours to your shape, while the firm Reflex foam beneath stops you sinking too deeply, so the hug stays shallow rather than swallowing. Underneath, Sealy's PostureTech springs respond to weight by firming up where you press hardest, which means heavier areas like hips get more pushback and your spine stays straighter. It conforms to BS7177 fire safety standards including the stricter Crib 5 rating, and Sealy is a National Bed Federation approved brand. Available in UK Single through to Super King.
Key Features & what's inside
- MemorySense foam. Sealy's MemorySense foam sits on top and contours to your shape, easing weight off pressure points like hips and shoulders. You feel it as a gentle, relieving cradle rather than a firm surface.
- Reflex Foam. A firm Reflex foam layer follows, contouring to your body while stopping you sinking too deeply. In practice this keeps the memory foam feel shallow and supportive, which makes changing position easier.
- PostureTech Core Support Springs. Sealy's PostureTech springs form the core and become firmer when met with pressure, so support increases exactly where your body pushes hardest. The tops of the springs are made to a softer tension, which means they follow your shape rather than feeling rigid.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
Lightweight side sleepers may find the medium to firm feel a little unforgiving at the shoulder. If you dislike the slow, moulding sensation of memory foam altogether, a traditional sprung mattress will suit you better. And at £775 upwards, budget shoppers will find gentler options on the wallet.
Sealy Imperial Contract Memory Mattress
How firm is the Sealy Imperial Contract Memory Mattress?
Sealy describes it as medium to firm. That places it towards the supportive end of the scale, well suited to back and stomach sleepers and heavier bodies, though lighter side sleepers may want something softer.
Does the Sealy Imperial Contract come with a trial period?
MattressOnline lists a 100-night trial on this mattress, but it is the retailer's own offer rather than a Sealy policy, and it requires buying a mattress protector from MattressOnline. If you purchase elsewhere, check that retailer's returns terms before ordering.
How long is the guarantee on the Sealy Imperial Contract Memory Mattress?
The retailer listing states a 5 year guarantee. As with the trial, confirm the guarantee terms with whichever retailer you buy from.
How deep is the Sealy Imperial Contract Memory Mattress?
It measures 31cm deep, which is a generously deep build. Standard fitted sheets may feel tight, so deep-fitted sheets are a safer bet.
What sizes does the Sealy Imperial Contract come in?
It's available in UK Single, Double, King and Super King, with prices ranging from £775 to £1,385 depending on the size you choose.
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