Sealy Waltham Latex Advantage Mattress
Mattress
Sealy Waltham Latex Advantage Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
29
Layers
3
Layer Details
- Quilted sleep surface. A plush quilted top adds the final touch of comfort. This gives the mattress a softer initial feel before you reach the firmer layers below.
- Latex. A plush, adaptive material that responds to your body shape for individualised comfort. It contours without the slow sink of memory foam, which means easier movement and a cooler sleep.
- PostureTech Core Support Springs. Sealy's own spring design uses unique shapes and varied tension to deliver full-body support and pressure relief. In practice this means firmer resistance where you carry more weight, so your spine stays better aligned.
Layer details from mattressonline.co.uk product page, September 2026.
- 90cm of width each: Two people sharing get 90cm each, which means a partner who turns often is simply further away and much easier to ignore.
- Latex keeps movement quiet: The latex layer responds to your shape without the slow sink of memory foam, so shifting position at night is easier and less disruptive across a shared bed.
- Room for the whole household: If children or a large dog treat your bed as theirs, the 6ft x 6ft 6in footprint means everyone still gets a fair share.
- Medium firm across a wide surface: The PostureTech springs give firmer resistance under hips and a little more give at shoulders, and that steadiness holds across the full 180cm width.
- Suits a larger master: In a big bedroom a UK king can look undersized; the UK super king fills the space properly, provided you allow at least 3m x 2.9m.
This size suits you if...
You share the bed every night and want the most space a standard UK size offers, your children or pets regularly join you and a smaller bed leaves someone pushed to the edge, or your partner is genuinely restless and you've learned that distance matters more than any comfort layer. A large master bedroom of at least 3m x 2.9m helps it feel in proportion.
Consider another size if...
Your bedroom falls short of the 3m x 2.9m we suggest, or the bed would crowd wardrobes and door swing. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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How much space do we each get on a super king Sealy Waltham?
Two people sharing get 90cm each. That's the same width per person as a UK single, which is why the UK super king is the size we point restless couples towards. On this mattress the latex layer also makes movement less noticeable, so the extra width and the surface work together.
Is the Sealy Waltham super king much bigger than the king size?
The UK super king is 30cm wider than the UK king, and the two are the same length at 200cm. All of that extra width goes into space between you and your partner, which is where it counts if one of you fidgets or a child climbs in at 3am.
Do I need a bigger room for the super king than the UK king?
Yes, a little. We suggest at least 3m x 2.9m for the UK super king, against 2.7m x 2.9m for the UK king. Around 3.5m x 3.2m feels more comfortable, leaving room for bedside tables on both sides and a clear door swing. Measure before you commit; this size dominates a modest room.
Is a super king good for a restless partner?
It's the best mainstream answer to one. With 90cm each, most turning and repositioning happens too far away to wake you, and the latex comfort layer on the Sealy Waltham lets a sleeper move without the slow, disturbing sink of memory foam. Distance does more for broken sleep than any comfort layer alone.
Is the Sealy Waltham super king worth it for a family who share the bed?
If children or a large dog join you most nights, yes. The 180 x 200cm surface means an extra body doesn't force anyone to the edge, and the medium firm feel with firmer support under heavier areas holds up well with uneven weight across the bed. In a smaller size, regular co-sleeping usually means someone loses out.