MattressNextDay Deluxe Memory Foam Mattress
Mattress
MattressNextDay Deluxe Memory Foam Mattress
Size
Firmness
Medium
Construction
Depth (cm)
25
Layers
2
Layer Details
- Memory Foam. Memory foam, originally designed by NASA, moulds to your body, which means your weight is spread evenly and pressure eases at your hips and shoulders. The brand describes the support as orthopaedic, meaning it aims to keep your spine in a comfortable position as the foam contours.
- Knitted Cover. A soft knitted cover sits on top, and it's breathable, which helps keep you at a more even temperature through the night. That matters with memory foam, which can otherwise feel a little warm.
Layer details from mattressnextday.co.uk product page, September 2026.
- 90cm of width each: Two people sharing get 90cm each, which means a fidgeting partner can turn over without their elbow entering your half of the bed.
- Foam absorbs movement: Memory foam soaks up motion rather than bouncing it across the bed, and at this width most movement won't reach you at all.
- Space for the whole household: If children or a large dog treat your bed as theirs, the extra room means everyone still gets a usable share rather than a sliver.
- 25cm of depth across the full footprint: The mattress keeps its 25cm depth at this size, so there's proper substance under each sleeper even near the edges.
- Cooler with distance between you: Memory foam runs warmer than springs, but at 90cm each you're less likely to share body heat, which takes the edge off.
This size suits you if...
You share the bed every night and want genuine distance from a restless partner, your children or pets regularly join you and a UK king already feels crowded, or you have a large master bedroom where anything smaller would look undersized. You'll need at least 3m x 2.9m of floor space, and ideally more, for the room to still function around it.
Consider another size if...
Your bedroom measures less than 3m x 2.9m, or you'd struggle to get a one-piece 180cm foam mattress up your stairs. We'd recommend the UK super king's nearest sibling, the UK king, instead: it's 30cm narrower, the same length, and needs at least 2.7m x 2.9m.
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.
Is the MattressNextDay Deluxe super king big enough for a family who share the bed?
It's the most practical size for it. Two adults get 90cm each, so when a child wanders in at 3am there's room to absorb them without anyone ending up on the edge. The memory foam also dampens all that shuffling, which means the person furthest from the door has a fair chance of sleeping through it.
Should I choose the UK king or the UK super king in the MattressNextDay Deluxe?
The UK super king is 30cm wider than the UK king and the same length, giving each of two sharers 15cm more space. If a restless partner or visiting children are the problem, that extra width matters. The trade-off is room size: we suggest at least 3m x 2.9m for the UK super king, against 2.7m x 2.9m for the UK king.
Does memory foam help with a restless partner in a super king?
Yes, and the two things work together. Memory foam absorbs movement rather than transferring it, so a partner turning over sends little disturbance across the mattress. The UK super king adds 90cm of space each on top of that. Distance beats any comfort layer, but here you get both, which is why this size suits light sleepers sharing with fidgets.
How much bigger is the UK super king than the UK double in this mattress?
The UK super king is 45cm wider and 10cm longer than the UK double. For two people sharing, that works out at 22.5cm more space each, roughly the difference between negotiating for room and forgetting your partner is there. It does demand a bigger room: allow at least 3m x 2.9m, against 2.6m x 2.8m for the UK double.
Where can I buy the MattressNextDay Deluxe in a UK super king?
Compare the retailers listed on this page. The prices shown here are updated as retailers change them, so what you see is current rather than a snapshot. It's worth checking back before you buy, since stock and pricing on larger sizes like the UK super king tend to move around more than the popular middle sizes.