Kaymed Smart Latex 3500 Box Top King Size Mattress
The Kaymed Smart Latex 3500 Box Top is a hybrid mattress that pairs pocket springs with a 75mm graphite-infused latex layer, all topped with a box top for a softer first impression.
- Graphite latex draws heat away
- Suits back & combination sleepers
- Stable edges, use the full width
£1,519
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Kaymed Smart Latex 3500 Box Top Mattress
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Mattress details
Mattress
Kaymed Smart Latex 3500 Box Top Mattress
Size
Firmness
Medium Firm
Construction
Foam
Pocket Spring
Hybrid
Latex
Depth (cm)
40
Layers
4
Layer Details
Quilted cover
A quilted cover creates a comfortable sleep surface. It's the first thing you'll feel, adding a soft, cushioned finish.
Box top / Pillow top
An additional comfort layer stitched on top for a more luxurious feel. This softens the initial feel without changing the underlying support.
Latex
A 75mm layer of latex offers relaxing pressure relief, which means it cradles hips and shoulders while springing back quickly as you move. It's infused with graphite for cooler rest, useful if you tend to overheat.
Pocket springs
3500 pocket springs, based on the kingsize, provide adaptive support by responding to each part of your body independently. Foam encapsulated edge support firms up the sides, so you won't feel a roll-off sensation at the edge.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- The full 3500 springs: Kaymed's spring count is based on the kingsize, so this is the size where you actually get all 3500 pocket springs responding to each of you independently.
- 75cm each, every night: Two people sharing get 75cm apiece, which on a springy, responsive latex surface means you can change position without meeting in the middle.
- Less partner disturbance: Pocket springs move independently, so when one of you gets up hours before the other, the sleeper left behind feels far less of it across 150cm of width.
- Length for taller sleepers: At 200cm, the UK king is 10cm longer than the UK double, a genuine relief if one of you is approaching six foot.
- Usable right to the edge: Foam encapsulated edges firm up the sides, so all 150cm is sleepable width rather than a soft border you avoid.
- Cool across a bigger surface: The graphite-infused latex draws heat away, useful when two bodies are warming one mattress all night.
This size suits you if...
You share the bed every night and a double has started to feel like a compromise, one of you keeps different hours and the other feels every exit, or one partner is tall enough that 190cm mattresses leave feet hanging. The UK king gives you 75cm each and 200cm of length without demanding the floor space a UK super king does.
Consider another size if...
Your bedroom is under the 2.7m x 2.9m we suggest for a UK king, or you sleep alone and would rather spend the difference elsewhere. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Does the UK king Kaymed Smart Latex 3500 have the full spring count?
Yes. Kaymed bases the 3500 figure on the kingsize, so this is the size where the name and the mattress actually match. Smaller sizes of the same model contain fewer springs, simply because there's less area to fill. If the spring count influenced your shortlist, the UK king delivers it in full.
Is the Kaymed Smart Latex 3500 in a UK king good for couples?
It's well suited to sharing. You get 75cm each for two people, pocket springs that absorb movement so an early riser disturbs the other less, and foam encapsulated edges that let you use the full 150cm width. The medium firm feel keeps you both on the surface rather than rolling together.
What room size do I need for a UK king Kaymed Smart Latex 3500?
We suggest a room of at least 2.7m x 2.9m for a UK king, with more feeling comfortable once wardrobes and bedside tables are in. New build master bedrooms can be tighter than they first appear, so measure the usable floor rather than the plan. That guidance is ours, not Kaymed's.
Is the UK king long enough for a tall sleeper?
At 200cm, the UK king is 10cm longer than the UK double, which is often the difference between feet on the mattress and feet off the end for anyone around six foot. If length is your reason for upgrading, the UK king solves it; the UK super king is the same length, so sizing up again only buys width.
Should I choose this mattress in a UK king or a UK super king?
The UK king is 30cm narrower than the UK super king; both are 200cm long. If you share with a restless partner, or a dog treats the bed as its own, the UK super king's extra width is tempting, but we suggest a room of at least 3m x 2.9m for it. The UK king fits more homes.