Sealy Balance Hybrid Memory Mattress
Mattress
Sealy Balance Hybrid Memory Mattress
Size
Firmness
Construction
Depth (cm)
29
Layers
3
Layer Details
- Memory Foam. Memory foam moulds to the shape of your body, which means pressure points like hips and shoulders get cushioned rather than pushed against. It gives an orthopaedic style of support with a slow, cradling feel.
- Tencel® Fibres. These soft, eco-friendly fibres give the surface a silky-smooth feel. They're naturally breathable too, helping the mattress stay fresher and more comfortable through the night.
- 1400 Pocket Springs. Each of the 1400 springs sits in its own fabric pocket, so they compress independently rather than as one unit. That means better pressure-relieving support where your body needs it, and less motion transfer across the bed.
Layer details from mattressnextday.co.uk product page, September 2026.
- 90cm of width each: Two sharers each get 90cm, so a child wandering in at 3am can squeeze in without anyone ending up on the edge.
- Distance plus pocket springs: The 1400 pocket springs compress independently, and across 180cm of width a fidgeting partner's movement barely reaches your side at all.
- Room for pets who won't be told: If a large dog treats the foot of the bed as home, the super king absorbs that habit where a UK double simply can't.
- Cooler with more space: Memory foam holds some warmth, but the Tencel fibres breathe and the extra width lets hot sleepers spread out away from a partner's body heat.
- A substantial bed for a large room: In a big master bedroom a smaller mattress can look lost; at 6ft x 6ft 6in and 29cm deep, this one fills the space properly.
This size suits you if...
You share every night and want genuine distance from a restless partner, your children or pets regularly join you and a UK king has started to feel crowded, or you have a large master bedroom where anything smaller would look undersized. Your room should measure at least 3m x 2.9m, and closer to 3.5m x 3.2m if you want walking space on both sides.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest, or you'd struggle to get a 180cm mattress round your landing. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs a room of at least 2.7m x 2.9m.
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What are the dimensions of the Sealy Balance Hybrid in a UK super king?
It measures 180 x 200cm, which is 6ft x 6ft 6in. That works out at 90cm of width each for two people sharing, the most space any standard UK size offers. The mattress itself is 29cm deep, so budget for deep fitted sheets alongside super king bedding and a 260 x 220cm duvet.
How much bigger is the super king than the UK king?
The UK super king is 30cm wider than the UK king, and the two sizes are the same length. That extra 30cm sounds modest but it's the difference between a child climbing in at night being manageable and everyone waking up. If your room can hold it, the width is what you're paying for.
What size room do I need for the Sealy Balance Hybrid super king?
We suggest at least 3m x 2.9m, with around 3.5m x 3.2m feeling comfortable. That's our guidance rather than Sealy's, and it assumes you want to walk round both sides and open drawers without shuffling sideways. Check door swing and any tight landing turns too, since a 180cm mattress is awkward to manoeuvre.
Is the Sealy Balance super king good for couples with a restless partner?
Yes, and for two reasons. The 1400 pocket springs compress independently, so movement doesn't travel across the bed the way it does on a connected spring unit. Just as usefully, 90cm each means you're physically further from the fidgeting. Distance does a lot of the work that comfort layers get credit for.
Can a family share the Sealy Balance Hybrid super king?
It's the most realistic size for it. With 180cm of width, a young child or a dog joining you overnight still leaves adults with usable space, where a UK double turns the same visit into a squeeze. The medium firm feel also holds up well across the full surface, so no one ends up in a dip at the middle.