Sealy Serenity Mattress
Mattress
Sealy Serenity Mattress
Size
Firmness
Firm
Construction
Depth (cm)
Layers
2
Layer Details
- Foam layers. Foam comfort layers sit above the springs, which means a slightly cushioned surface feel over the firm support beneath. They complement rather than mask the spring system below.
- AlignSupport® spring system. An open-coil spring system exclusive to Sealy that forms the mattress's supportive core. Open coils give a springy, connected feel across the whole surface, keeping you supported rather than cradled.
Layer details from mattressman.co.uk product page, September 2026.
- 90cm of width each: Two sharers each get 90cm of space, which means a restless partner can turn over all night without either of you meeting in the middle.
- Firm support across the full width: Sealy's AlignSupport® open-coil system springs evenly edge to edge, so the outer stretches of this wide surface feel as supportive as the centre.
- Room for the whole household: When a child pads in at 3am, or the dog treats the bed as routine, this width means everyone keeps a workable share.
- Distance beats any comfort layer: Open coils transmit some movement, but at 180cm wide the sheer space between you does more to protect your sleep than any foam could.
- A no-sink surface at scale: Foam comfort layers soften the top slightly without letting you sink, which means moving across a bed this size stays easy rather than effortful.
This size suits you if...
You share every night and want the most sleeping space a standard UK size offers, your partner is genuinely restless and you have decided distance matters more than motion isolation, or children and pets regularly join you and a UK king has started to feel crowded. Your bedroom should comfortably clear our suggested minimum of 3m x 2.9m.
Consider another size if...
Your room measures under 3m x 2.9m, or the bed would dominate a smaller master. The UK king is 30cm narrower at the same length, and we suggest at least 2.7m x 2.9m for it, which suits far more UK bedrooms.
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Will a Sealy Serenity super king fit in my bedroom?
The mattress measures 180 x 200cm, and we suggest a room of at least 3m x 2.9m, with around 3.5m x 3.2m feeling more comfortable. Check door swing and any landing turns too: a mattress this size is the one most likely to struggle on stairs, so measure the route as well as the room.
Is the Sealy Serenity super king good for restless couples?
Yes, with one caveat. Open coils like Sealy's AlignSupport® system transmit more movement than pocket springs, but at this width you each get 90cm, and that distance does most of the work. If your partner fidgets, the space in a super king matters more than the spring type.
Is the super king Sealy Serenity too big if children share the bed?
It is the size we would point families towards. When a child climbs in, two adults on a narrower mattress lose most of their space; at 180cm wide everyone keeps a reasonable share. The firm surface also makes it easier to move without disturbing whoever is asleep beside you.
Where can I buy the Sealy Serenity in a super king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so the live table is the reliable place to check availability for this size rather than anything written in the copy.
Should I choose the Sealy Serenity in a king or super king?
The UK super king is 30cm wider than the UK king, and the two are the same length. If you share with a restless partner, or children or pets join you often, that extra width is the whole point. If your room is under 3m x 2.9m, the UK king is the safer choice.