Sealy PosturePedic Sandridge Combination Single 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
£1,399
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
- Leaves floor space free: At 3ft x 6ft 3in, the UK single sits comfortably in a child's room alongside a wardrobe and desk, with space left to open drawers.
- Firm support for one: A solo sleeper gets the full firm feel, with the plant-based foam layer adding some give at the hips and lower back so it doesn't feel hard.
- Suits two-bed rooms: Its 90cm width means a pair of UK singles can share a guest room or a siblings' bedroom while still keeping a walkway between them.
- Fits under a sloping ceiling: In a loft conversion, the narrow UK single footprint is easier to tuck under the slope than any wider size of this mattress.
- Easy to dress: Standard single sheets and a single duvet at 135 x 200cm fit, and they are the most widely stocked bedding of any UK size.
This size suits you if...
You sleep alone and like a firm mattress, or you're furnishing a child's or teenager's bedroom where the bed shares floor space with storage and a desk. It also suits you if you're setting up a compact spare room or a loft conversion, where a 90cm wide bed leaves room to move.
Consider another size if...
Two people will share the bed regularly, even for occasional guests. We'd recommend the UK double instead, which gives 67.5cm each for two sharing and needs at least 2.6m x 2.8m.
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
Will the Sealy Sandridge UK single fit a bunk bed or mid sleeper?
It may not. This mattress is 30cm deep, and raised frames such as bunks, cabin beds and mid sleepers usually set a maximum mattress depth so the guard rail stays high enough to be safe. Check the frame maker's stated limit before buying, rather than assuming any UK single mattress will fit.
Is a firm UK single mattress a good idea for a child?
It can be, for a child who sleeps on their back. Sealy rates the Sandridge as firm, and lighter side sleepers, which includes many children, may find the shoulders feel a little pressured. If your child mostly sleeps curled on their side, that is the one flaw to weigh up.
What size bedroom do I need for a UK single Sandridge?
We suggest allowing at least 2.1m x 2.8m of floor space for a UK single. That gives you room to walk alongside the bed and open a wardrobe or drawers without squeezing past, which matters most in a box room or a child's bedroom.
Is a UK single long enough for a tall teenager?
A UK single is 190cm long, or 6ft 3in. That suits most teenagers, but a very tall one may find their feet near the end. The UK king is 10cm longer than the UK single, although it is also 60cm wider and needs at least 2.7m x 2.9m of room.
Should I put a UK single or UK double in a spare room?
If your guests usually come alone, a UK single leaves the room usable as a study. The UK double is 45cm wider and gives 67.5cm each for two sharing, but we suggest at least 2.6m x 2.8m for it. Couples will be far more comfortable in the UK double.