Sealy Advantage Memory Essential Small Double Mattress
The Sealy Advantage Memory Essential pairs a MemorySense memory foam comfort layer with PostureTech Core Support Springs, which means you get that slow-sinking foam feel with a bit more bounce and support underneath than an all-foam design.
- Eases pressure at shoulders & hips
- Suits back & stomach sleepers
- Spring core lets air flow through
£375
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Sealy Advantage Memory Essential Mattress
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Mattress details
Mattress
Sealy Advantage Memory Essential Mattress
Size
Firmness
Medium Firm
Construction
Foam
Memory Foam
Depth (cm)
27
Layers
2
Layer Details
Comfort Layer
A layer of MemorySense memory foam sits on top, which means it moulds to your body shape and eases pressure on your shoulders and hips. It gives you that gentle cradling feel memory foam is known for.
Support System
Beneath the foam, PostureTech Core Support Springs do the structural work, keeping your spine aligned and adding responsiveness so you don't feel stuck when changing position. The springs also allow more airflow than a solid foam base.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Real room to spread out: At 120cm wide, a solo sleeper gets space to shift position freely, and the PostureTech springs mean you won't feel stuck when you do.
- Fits compact double bedrooms: Being 15cm narrower than a UK double, it slots into box rooms and studio flats where every centimetre of floor space matters.
- Copes with the odd shared night: Two people can share for occasional stays, and the memory foam layer cushions shoulders and hips for whoever ends up sleeping on their side.
- Easy to find bedding and frames: The 4ft small double is a standard UK size, so fitted sheets and frames are widely stocked rather than a specialist hunt.
- Modest room requirement: We suggest a room of at least 2.4m x 2.8m, noticeably less than the 2.6m x 2.8m we'd want for a UK double.
This size suits you if...
You sleep alone and have outgrown a UK single but your room can't take a full double, you're furnishing a guest room or holiday let where couples stay occasionally rather than nightly, or you're downsizing and the bed has to suit the new room. The medium firm feel works well here for solo back and stomach sleepers who want space without a bigger footprint.
Consider another size if...
You share the bed every night, as 120cm leaves each of you with less width than a UK single. We'd recommend the UK double instead, which is 15cm wider; allow a room of at least 2.6m x 2.8m for it.
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FAQ's
What room size do I need for the Sealy Advantage Memory Essential in a small double?
We suggest a room of at least 2.4m x 2.8m. That allows the door to clear the bed and leaves walking space along the sides, which is often the deciding factor in a box room or studio. This is our own guidance rather than Sealy's, so measure your room before ordering.
Is the small double Sealy Advantage big enough for a couple?
For occasional nights, yes, which makes it a sensible guest room choice. For every night, we'd say no: 120cm shared means each person gets less width than a UK single. Springs also transmit slightly more movement than all-foam designs, so a restless partner is easier to notice. Nightly sharers should consider the UK double, 15cm wider.
Should I choose the Sealy Advantage in a UK small double or a UK double?
It comes down to your room. The UK small double is 15cm narrower than the UK double and both are 190cm long, so the small double suits rooms under our suggested 2.6m x 2.8m for a double. If you sleep alone, the small double gives generous space; nightly couples should stretch to the double if the room allows.
How big is the small double Sealy Advantage in feet?
It measures 4ft x 6ft 3in, or 120 x 190cm. The 4ft width is a standard UK small double, so any small double frame or divan base should fit it, and small double fitted sheets are easy to find. Length matches the UK single and UK double, so it only saves you width, not floor length.
Is a small double long enough for a tall teenager?
At 190cm it's the same length as a UK single and UK double, so moving up from a single gains width rather than length. For most teenagers that's the right trade: 30cm more width to spread out, without losing the floor space a full double would take. Anyone very tall should note the UK king is 10cm longer.