Sealy Advantage Memory Essential Mattress
Mattress
Sealy Advantage Memory Essential Mattress
Size
Firmness
Medium Firm
Construction
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.
- Fits a compact bedroom: At 90cm wide it leaves floor space for a desk, wardrobe and toy storage, which matters in a child's room where the bed already competes for space.
- Memory foam sized for one: The MemorySense layer cradles a single sleeper's shoulders and hips, and with nobody beside you the springs' extra motion transfer stops being a concern.
- Grows with a child: The medium firm feel gives a growing child or teenager proper spinal support from the PostureTech springs rather than a soft surface they'll sink into.
- Practical for guest and spare rooms: A UK single tucks against a wall in a spare room that doubles as an office, keeping the desk usable during the working week.
- Cheap, easy bedding: Standard single sheets and a single duvet fit, and they're the most widely stocked and least expensive bedding of any UK size.
This size suits you if...
You're buying for a child's room or a teenager, where a 90cm wide bed leaves space for everything else the room has to hold. It also suits a solo adult in a student room or first flat where the frame is provided and the mattress isn't, or a spare room that needs a comfortable guest bed without giving up the whole floor.
Consider another size if...
You're an adult who sleeps starfish-style or simply wants more room to turn over. The UK small double is 30cm wider at the same length, and we suggest at least 2.4m x 2.8m of floor space for it.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
How big is the Sealy Advantage Memory Essential in a UK single?
It measures 90 x 190cm, which is 3ft x 6ft 3in. That's the standard UK one-person size, so it fits any standard single bed frame. We suggest a room of at least 2.1m x 2.8m to leave walking space around the bed.
Is the UK single Sealy Advantage Memory Essential good for a child?
Yes, with one caveat. The medium firm feel and PostureTech spring support suit growing bodies well, and the memory foam layer adds comfort without being so soft a child sinks in. Very light children may find it a little firm at first, but for most kids and teens it's a solid long-term choice.
Will this mattress work on a bunk or mid sleeper frame?
The UK single is the standard size for bunk beds and mid sleepers, so the footprint fits. Do check your frame's maximum mattress depth though: this mattress is 27cm deep, which is taller than some bunk guard rails allow. Measure from the base to the top of the rail before ordering.
Can two Sealy Advantage Memory Essential singles share a room?
Comfortably, in most children's bedrooms. Each mattress is 90cm wide, so two beds along opposite walls leave a walkway between them in an average-sized room. It's a common setup for siblings sharing, and it means each child gets their own supportive surface rather than sharing a larger bed.
Should a single adult size up from the UK single?
If your room allows, yes. The UK single works fine for one adult, but the UK small double is 30cm wider at the same length and gives noticeably more room to spread out. Allow at least 2.4m x 2.8m of floor space for the UK small double before committing.