Kaymed Smart Latex 3500 Box Top Single 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
£1,059
Get the lowest price we've found
Save with the previous model
Some retailers still sell the earlier version of this mattress for less than the current model's best price.
Kaymed Smart Latex 3500 Box Top Mattress
More available sizes
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
- Fits where space is tight: At 90cm wide it slots into a loft room with a sloping ceiling or a spare room doubling as an office, and we suggest at least 2.1m x 2.8m of floor space.
- Full latex feel for one sleeper: You get the same 75mm graphite-infused latex layer as the larger sizes, which means proper pressure relief for a solo sleeper without a shared-bed price.
- Edge support matters more in a single: Foam encapsulation firms up the sides, so on a 90cm width you can sleep near the edge without a roll-off feeling.
- Standard bedding, easy to dress: It takes ordinary single sheets and a single duvet, the cheapest and most widely stocked bedding of any UK size, though the 40cm depth needs deep fitted sheets.
- Cool for a warm room: The graphite infusion draws heat away, useful in loft conversions and small rooms that hold warmth in summer.
This size suits you if...
You sleep alone and want a genuinely high-end mattress in the standard one-person size, your room is compact, perhaps a loft conversion or a spare room that also holds a desk, and you'd rather spend on comfort than width, or you're furnishing a guest room where visitors stay often enough to deserve better than a budget single.
Consider another size if...
You're an adult with the floor space for something wider, or you sometimes share the bed. The UK double is 45cm wider and the same length; allow at least 2.6m x 2.8m and we'd recommend it instead.
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.
FAQ's
Is the Kaymed Smart Latex 3500 single suitable for a bunk or mid sleeper?
Probably not. This mattress is 40cm deep, which is far taller than most bunk and mid-sleeper frames allow: raised frames usually need a mattress shallow enough to keep the guard rail effective. Check your frame's maximum mattress depth before buying, and expect this one to exceed it.
How big is the Kaymed Smart Latex 3500 in a UK single?
It measures 90 x 190cm, or 3ft x 6ft 3in, the standard UK one-person size. Bear in mind the 40cm depth when choosing fitted sheets; standard single sheets fit the width and length, but you'll want extra-deep ones.
Does the single have fewer springs than the 3500 in the name?
Yes. The 3500 spring count is based on the kingsize, so the UK single, being 60cm narrower and 10cm shorter than the UK king, contains fewer springs. The support system works the same way; there's simply less mattress for the springs to fill.
Is a UK single big enough for an adult?
For a solo adult, yes, though 90cm is snug if you move around a lot in your sleep. The medium firm support here keeps you on top of the mattress rather than sinking in, which helps a narrower bed feel less confining. Restless sleepers with the room to spare might prefer the UK double.
What room size do I need for a single mattress?
We suggest allowing at least 2.1m x 2.8m of floor space for a UK single. That leaves room to walk around and open drawers, even in a child's room where the bed competes with a wardrobe and toy storage, or a spare room fitted with a desk.