Firmness
Medium Firm
Type
Hybrid
Depth (cm)
40
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
5
Price Range
£1,051 to £2,775
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
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 & what's inside
- 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.
Who's it NOT for?
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 of £1,051 is a serious spend. And at 40cm deep, it may sit too tall on some bed frames.
Kaymed Smart Latex 3500 Box Top Mattress
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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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