Sealy Posturepedic Elevate Blackwood Mattress
Mattress
Sealy Posturepedic Elevate Blackwood Mattress
Size
Firmness
Firm
Construction
Depth (cm)
Layers
4
Layer Details
- SmarTex® surface layer. A smart fabric woven into the surface that disperses heat away from your body. In practice, this means less of that clammy, overheated feeling in the small hours.
- Comfort Architecture. A blend of comfort layers and textiles sitting beneath the surface. This is the cushioning you feel first, before the support system takes over.
- AlignSupport™ Coil. Sealy's patented coil system, exclusive to Posturepedic, responds to your body's contours with initial comfort followed by deep-down support. The coils are twice-tempered, which means they're heat-treated for long-lasting strength and consistent performance.
- BasePlank™ Foundation. A solid base providing structural integrity from corner to corner. It works with the coil system above it to improve both support and airflow through the mattress.
Layer details from sealy.co.uk product page, September 2026.
- 67.5cm each for two sharing: Across the 135cm width you get 67.5cm each for two people sharing, the long-standing standard for UK couples.
- Firm support that suits sharing: The AlignSupport coil responds to each sleeper's contours individually, which means you both get support matched to your own shape rather than a one-note surface.
- Fits most UK bedrooms: We suggest a room of at least 2.6m x 2.8m, which most British doubles and second bedrooms can manage with furniture still in place.
- Cooler for two bodies: Two people generate more heat than one, and the SmarTex surface fabric disperses it away from you, so sharing feels less clammy on warm nights.
- Easy to dress: Double bedding is stocked everywhere at every price point, a small but real saving if you're kitting out a whole home at once.
This size suits you if...
You share the bed every night and your room is a typical UK size where a king would crowd the walkways, you sleep alone but want space to stretch out, or you're setting up a guest room that needs to handle visiting couples without dominating it.
Consider another size if...
You and your partner both want more personal space and your room measures at least 2.7m x 2.9m. In that case we'd recommend the Sealy Blackwood in a UK king instead, which is 15cm wider and 10cm longer.
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Is the Sealy Blackwood UK double big enough for a couple?
For most couples, yes. The 135cm width gives 67.5cm each for two people sharing, the traditional UK standard. The firm, coil-based feel helps here too, since a supportive surface tends to feel less cramped than a soft one you both sink into. If either of you sprawls, the UK king adds 15cm of width.
What size room do I need for the Sealy Blackwood in a UK double?
We suggest a room of at least 2.6m x 2.8m for the UK double, with around 3m x 3m the comfortable norm. That allows bedside tables on both sides and space to walk around the bed. If your room is smaller, the UK single works in rooms from 2.1m x 2.8m.
Should I buy the Sealy Blackwood in a UK double or a UK king?
It usually comes down to your room. The UK double is 15cm narrower and 10cm shorter than the UK king, and we suggest at least 2.7m x 2.9m for the UK king. If your bedroom clears that comfortably and you share every night, the extra width is a real upgrade. Tighter rooms suit the UK double.
Is a UK double Sealy Blackwood a good choice for one person?
It's a generous solo size. At 135 x 190cm you can spread out freely, and there's room left over if a dog or cat claims a corner of the bed. The firm feel gives a heavier solo sleeper consistent support across the whole surface rather than a soft dip in the middle.
Will the UK double Sealy Blackwood fit up a narrow staircase?
Sealy doesn't publish handling or weight guidance for this size, so measure before you order. The mattress is 135 x 190cm, or 4ft 6in x 6ft 3in, and coil-based mattresses generally shouldn't be folded. Check turning stairs in older terraces and tight new build landings against that longer dimension, and ask your retailer about delivery access.