Kaymed Smart Latex 3500 Box Top 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
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The Kaymed Smart Latex 3500 Box Top sits at the medium to firm end of the scale, which means you get a supportive feel with a plush surface rather than a sink-in one. At 40cm deep it's a substantial mattress, so check your fitted sheets will stretch. It comes in UK Single up to Super King. The spring count of 3500 is based on the kingsize, so smaller sizes will contain fewer springs.
Mattress specifications
Firmness
Medium Firm
Type
Hybrid
Depth (cm)
40
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
5
Price Range
£1,059 to £2,775
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
The main appeal here is latex without the usual heat problem. Latex offers relaxing pressure relief and lasts well, and the graphite infusion is there to draw heat away, which means warmer sleepers get the contouring without the stuffiness. The medium to firm support suits back and combination sleepers who want to stay on top of the mattress rather than in it, while the box top softens the surface just enough. Foam encapsulated edge support means you can use the full width of the bed, helpful for couples. It carries National Bed Federation approval, meets BS7177: 2008 fire standards for home use, and has a vegan-friendly construction, which is rare in a latex hybrid at this level.
Key features & 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.
Best suited for?
Back sleepers
Medium to firm support keeps you lying on top of the mattress rather than sinking in, while the box top softens the surface just enough.
Combination sleepers
The 75mm latex layer springs back quickly as you move, so changing position during the night feels easy rather than like climbing out of a dip.
Warm sleepers
Graphite infused into the latex is there to draw heat away, so you get the contouring of latex without the stuffiness.
Couples
Foam encapsulated edge support firms up the sides, so you can use the full width of the bed without feeling a roll-off at the edge.
Eco-conscious buyers
Its vegan-friendly construction is rare in a latex hybrid, and it also carries National Bed Federation approval and meets BS7177: 2008 fire standards for home use.
If you like a soft, sink-in feel, the medium to firm support here will probably feel too solid, particularly for lightweight side sleepers. Budget shoppers should also look elsewhere: even the starting price is a serious spend. And at 40cm deep, it may sit too tall on some bed frames.
Save on an earlier or ex-display model
Some retailers still sell the earlier version of this mattress, or ex-display and returned stock at a lower price. These are the sizes where it costs less than the current model's best price.
Kaymed Smart Latex 3500 Box Top Mattress
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FAQ's
Is the Kaymed Smart Latex 3500 firm or medium?
The product page describes it as medium to firm, though it uses medium-firm in places too. In practice that means solid support underneath with a softer surface from the box top and latex, suiting most back and combination sleepers, although lightweight side sleepers may find it a little too firm.
Does the Kaymed Smart Latex 3500 sleep hot?
It's designed not to. Latex can hold warmth, but this layer is infused with graphite to draw heat away, and the pocket spring core allows air to move through the mattress. If you're a hot sleeper, this is one of the more sensible latex options to consider.
Does the Kaymed Smart Latex 3500 come with a trial?
Mattress Online lists a 100-night trial and a 5-year guarantee on its listing. These are the retailer's own terms rather than a Kaymed promise, so if you buy elsewhere, check that retailer's trial and returns policy before ordering.
How deep is the Kaymed Smart Latex 3500 Box Top?
It's 40cm deep, which is noticeably taller than a standard mattress. That depth comes from the box top and comfort layers, but it does mean you'll likely need extra-deep fitted sheets, and it will add height to your bed frame.
Is the Kaymed Smart Latex 3500 vegan?
Yes, it has a vegan-friendly construction, so no wool or other animal-derived fillings. It's also a National Bed Federation Approved Brand and conforms to the BS7177: 2008 fire safety standard for home use.
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