Sealy PosturePedic Sandridge Combination Super King 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
£2,499
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
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
- 90cm each for two: Two adults each get 90cm of width, which means a partner who fidgets or gets up early is far less likely to wake you.
- Room for a small visitor: With 15cm more each than the UK king, a child climbing in during the night can usually fit between you without anyone ending up on the edge.
- Firm under extra weight: The AlignSupport coils give a firm base, so a large dog or a sleepy child shouldn't leave the dip a softer surface might.
- Sides you can use: UniCased edge support should keep the outer edges steadier, which helps on a bed this wide where you'll often sit to reach the far side.
- Cooler with company: The Black Diamond foam on top feels cool as you lie down, a small help when bodies and pets add warmth to the bed.
This size suits you if...
You share the bed with a restless partner and want real distance between you, your children or a large dog regularly end up in with you, and your bedroom comfortably clears our suggested minimum of 3m x 2.9m.
Consider another size if...
Your bedroom is smaller than 3m x 2.9m, or you sleep alone. We'd recommend the UK king instead, which needs at least 2.7m x 2.9m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
What size bedroom do I need for a Sandridge UK super king?
We suggest at least 3m x 2.9m for a UK super king, and around 3.5m x 3.2m tends to feel right once bedside tables and a wardrobe door are in play. In a loft conversion, check where the sloping ceiling falls first, since that usually decides which wall the bed can go against.
How much space does each person get on a UK super king Sealy Sandridge?
Two people sharing get 90cm each. That's 15cm more each than the UK king, and 22.5cm more each than the UK double, enough that a partner rolling over is much less noticeable.
Sealy Sandridge UK super king or UK king for a restless partner?
The UK super king is 30cm wider than the UK king and the same length, so all the gain is in width. If your partner's movement is what keeps you awake, that distance tends to help more than any comfort layer. If your room is tight, the UK king needs at least 2.7m x 2.9m.
What duvet fits a super king Sandridge mattress?
A 260 x 220cm duvet suits the UK super king, with super king fitted sheets. Bedding at this size costs more than king sets and is a little harder to find in store, so price up sheets and a duvet before you commit.
Will a 6ft Sealy Sandridge fit up my stairs?
The UK super king measures 6ft x 6ft 6in and is 30cm deep, so measure tight landing turns and check which way the bedroom door swings before ordering. Once you're confident it will make it up, compare the retailers listed on this page for this size.