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.
- Room for two without dominating the bedroom: At 135cm wide it gives a couple a proper shared bed while leaving space to walk round it, which a UK king often doesn't.
- 67.5cm each for two people sharing: That's the width each of you gets, enough for most couples, although restless sleepers who spread out may want more.
- Fits bedside tables on both sides: In a room of around 3m x 3m, a UK double usually leaves space for a table each side, which a wider size can rule out.
- The easiest size to dress and furnish: Double sheets and 200 x 200cm duvets are stocked everywhere at every price, useful if you're kitting out a whole home at once.
- Springs help with a shared bed's airflow: The PostureTech spring core lets air move through the mattress, which matters more with two bodies warming a 135cm width.
This size suits you if...
You share the bed every night and your bedroom sits comfortably above our suggested minimum of 2.6m x 2.8m, or you sleep alone and want space to stretch out, perhaps with a dog or cat claiming a corner. It's also a safe choice for a guest room that hosts visiting couples, since it's the size most people are used to sharing.
Consider another size if...
You and your partner both like room to move, and 67.5cm each feels tight. The UK king is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m of room and we'd recommend it instead.
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Is the Sealy Advantage Memory Essential double big enough for two adults?
For most couples, yes. The UK double gives 67.5cm each for two people sharing, and the medium firm feel with springs beneath the memory foam supports two different body weights reasonably well. One thing to weigh up: springs can pass on a little more movement than all-foam designs, so light sleepers sharing a 135cm width may notice a partner turning over.
What room size do I need for this mattress in a UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. At 135 x 190cm the mattress leaves enough clearance in most UK bedrooms for a wardrobe, drawers and bedside tables on both sides, which is often the deciding factor between a UK double and a UK king.
Should I get this Sealy in a UK double or a UK king?
It comes down to your room and how much space you each want. The UK double is 15cm narrower and 10cm shorter than the UK king, so it suits rooms where a king would crowd things; for the UK king we suggest at least 2.7m x 2.9m. If either of you is tall or a restless sleeper, the king's extra width and length are worth having.
Is the UK double a good size for a guest room?
It's arguably the safest guest room choice, because it accommodates visiting couples as well as solo guests, and double bedding is cheap and easy to find. The Sealy's medium firm feel suits back and stomach sleepers well, so it's a reasonable all-rounder for guests whose preferences you can't predict.
Will a double mattress fit up the stairs in a terraced house?
A 135 x 190cm mattress is usually manageable, and this one can flex a little because the memory foam layer sits over springs rather than a rigid frame. Even so, measure any turning stairs or tight landings first, as older terraces and some new builds have awkward corners. Check with the retailer listed on this page about delivery access before ordering.