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.
- Fits a busy child's room: At 90cm wide it leaves space for a desk, wardrobe and toy storage, which matters in a room a child actually lives in rather than just sleeps in.
- Full spec, smallest footprint: All 1400 pocket springs and the memory foam layer are present in the UK single, so a solo sleeper gets the complete build, nothing scaled back.
- Grows with a teenager: The medium firm feel and 29cm depth give proper adult-grade support, so this is a mattress a child won't outgrow the moment they hit a growth spurt.
- Sensible for spare rooms: A UK single suits a spare room that doubles as an office, keeping the floor clear on weekdays while giving guests genuine comfort rather than a token bed.
- Allergy friendly for kids: It's hypoallergenic and carries the Allergy UK Seal of Approval, reassuring if your child's sniffles flare up at bedtime.
This size suits you if...
You're buying for a child or teenager whose room has to hold a bed, desk and storage all at once, you sleep alone and want a full-spec hybrid without giving the mattress the whole room, or you're kitting out a spare room or student flat where the frame came with the place and the mattress didn't.
Consider another size if...
You're an adult who spreads out in your sleep or shares the bed even occasionally. The UK double, 45cm wider and the same length, would suit you better; allow at least 2.6m x 2.8m of floor space for it.
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Will the Sealy Balance Hybrid UK single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk and mid sleeper frames, so width and length are fine. Depth is the thing to check: at 29cm this is a substantial mattress, and many raised frames set a maximum depth so the safety rail still sits high enough. Measure your frame's limit before ordering.
Is the UK single Sealy Balance Hybrid big enough for an adult?
For one adult, yes. At 3ft x 6ft 3in it's the standard UK one-person size, and the 1400 pocket springs and memory foam are identical to the larger sizes. Taller or broader adults, or anyone used to sprawling, may feel hemmed in, in which case the UK small double adds 30cm of width at the same length.
What room size do I need for a single mattress like this?
We suggest allowing at least 2.1m x 2.8m of floor space, which gives you room to walk round the bed and open drawers. That's our guidance rather than Sealy's. A UK single is the easiest size to place, so it works under loft slopes and in box rooms where nothing wider would go.
Is the Sealy Balance Hybrid single suitable for a child?
Yes, with one caveat. The hypoallergenic build and Allergy UK Seal of Approval are genuine positives for children, and the support will last through their teens. The medium firm feel is on the solid side for a very light child, who will sink less into the memory foam and feel the firmness more.
Can I put two Sealy Balance Hybrid singles in one guest room?
Often, yes. Two UK singles at 90cm wide each are a flexible guest room setup, sleeping two people who'd rather not share, and each needs its own walkway. Compare the retailers listed on this page for the UK single; prices shown here are updated as retailers change them.