Sealy PosturePedic Sandridge Combination Double Mattress
The Sealy PosturePedic Sandridge Combination Mattress combines a cooling Black Diamond foam top layer with twice-tempered coils, which means a firm, supportive feel that starts cool and stays steady underneath you.
- Instant cooling feel on top
- Cushions hips & lower back
- Handmade in the UK
£1,799
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Sealy PosturePedic Sandridge Combination Mattress
More available sizes
Mattress details
Mattress
Sealy PosturePedic Sandridge Combination Mattress
Size
Firmness
Firm
Construction
Foam
Depth (cm)
30
Layers
3
Layer Details
INFUSE Black Diamond foam
The top layer, designed to give an instant cooling feel. That means the surface feels fresh when you first lie down.
INFUSE Eco ComfortCore foam
A sustainable plant-based foam that cushions the hips and lower back. It adds some give to an otherwise firm mattress.
AlignSupport Coil
Sealy's patented coils, twice tempered for extra strength and durability. They form the supportive base, so the mattress should keep its firm feel over time.
Layer details from crushedvelvetbedstore.co.uk product page, November 2026.
Key benefits
- Room for two, room for furniture: At 135 x 190cm, the UK double leaves floor space a UK king would take up, so drawers and a bedside table on each side usually still fit.
- Firm support for both of you: Both sleepers get the same firm base, with plant-based foam cushioning hips and lower back, which suits couples sharing 67.5cm each rather than spreading out.
- Usable edges on a narrower bed: Sealy's UniCased edge support should keep the sides dependable, which helps on a UK double where each of you sleeps closer to the edge.
- A cooler feel when sharing: The Black Diamond foam on top feels cool as you lie down, a small help when two people share a smaller surface.
- Easy bedding to find: Standard double sheets fit, along with a 200 x 200cm double duvet, so replacing bedding for this mattress is straightforward.
This size suits you if...
You share a bed in an average UK bedroom and want firm support without losing the space for wardrobes and bedside tables, or you're kitting out a guest room where visiting couples need a proper shared bed that doesn't fill the room.
Consider another size if...
You and your partner already feel cramped side by side, or one of you is tall. We'd recommend the UK king instead, and suggest at least 2.7m x 2.9m for it.
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FAQ's
Is the Sealy Sandridge UK double big enough for two people?
For most couples, yes. The UK double gives 67.5cm each, which suits partners who sleep fairly still. If one of you sprawls, the UK king gives 7.5cm more each. With a firm mattress like the Sandridge, the width is usually the deciding factor rather than the feel.
What size bedroom do I need for a Sealy Sandridge double?
We suggest at least 2.6m x 2.8m for a UK double, with around 3m x 3m as the comfortable norm. That larger footprint gives you space to walk round both sides and open wardrobe doors without squeezing past the bed.
Sealy Sandridge double vs king: which should I choose?
The UK double is 15cm narrower and 10cm shorter than the UK king. Pick the UK double if your room is under our suggested 2.7m x 2.9m for a UK king, or you want bedside tables to fit comfortably. Choose the UK king if space between you matters more than floor space.
Will a UK double Sealy Sandridge fit up narrow stairs?
At 135 x 190cm and 30cm deep, a UK double can be awkward on turning stairs in older terraces or on a tight new build landing. Measure the stair width and any landing turns before ordering, then compare the retailers listed on this page.
What bedding fits a Sealy Sandridge UK double mattress?
Standard double sheets and a 200 x 200cm double duvet fit the UK double. The mattress is 30cm deep, so check your fitted sheet's pocket depth suits that before you buy, as shallow sheets can pull off the corners.