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.
- Room to sleep apart, together: At 75cm each for two people sharing, you can settle into your own patch of memory foam without negotiating over the middle.
- Movement stays on their side: The 1400 pocket springs compress independently, which means an early alarm and a quiet exit on one side is far less likely to wake the other.
- Length for taller sleepers: The UK king is 10cm longer than the UK double, so anyone approaching 6ft gets their feet on the mattress rather than off the end.
- Width you notice every night: It's 15cm wider than the UK double, enough that a dog claiming its usual spot no longer forces one of you to the edge.
- A substantial build at this scale: At 29cm deep across the full 150cm width, the mattress feels solid rather than saggy at the edges, useful when two people spread out.
This size suits you if...
You share the bed every night and the UK double has started to feel like a compromise, one of you is tall enough that 190cm mattresses leave feet dangling, or your mornings run on different clocks and you want a partner's exit to go unnoticed. A bedroom of at least 2.7m x 2.9m gives it room to breathe.
Consider another size if...
Your bedroom falls short of our suggested 2.7m x 2.9m minimum, or you sleep alone. We'd recommend the UK double instead, which needs a slightly smaller room at 2.6m x 2.8m.
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How much space do two people get on a UK king Sealy Balance Hybrid?
You get 75cm each for two people sharing. That's a genuine difference from a double, where couples often end up shoulder to shoulder. On the Sealy Balance Hybrid it also means each of you sinks into your own section of memory foam, so one person shifting position doesn't drag the other with them.
Is the Sealy Balance Hybrid UK king long enough for someone over 6ft?
At 200cm long, it gives 10cm more length than the UK double, and for many taller sleepers that extra length is the real reason to size up. If you or your partner currently sleep diagonally or with feet over the edge, the UK king solves that without needing a much bigger room.
Will the UK king Sealy Balance Hybrid reduce partner disturbance?
It helps in two ways. The width gives you 75cm each, so an early riser can slip out from their own side rather than climbing past you. And the 1400 pocket springs move independently, meaning movement on one half of the 150cm surface transfers far less to the other. Light sleepers on different schedules tend to feel the difference quickly.
What size room do I need for this mattress in a UK king?
We suggest at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable once wardrobes and bedside tables are in. New build master bedrooms often look bigger on the plan than they feel furnished, so measure the usable floor space, particularly the walkway on each side of the bed.
Should I get the Sealy Balance Hybrid in a UK king or a UK super king?
The UK super king is 30cm wider than the UK king, and the two are the same length, so it's purely a width decision. If a pet routinely shares the bed or you both like to sprawl, the extra width is tempting, but you'll need a room of at least 3m x 2.9m. For most couples the UK king is the sensible middle ground.