Kaymed Smart Latex 3500 Box Top Mattress
Mattress
Kaymed Smart Latex 3500 Box Top Mattress
Size
Firmness
Medium Firm
Construction
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.
- Edge support that matters more when sharing: Foam encapsulation firms up the sides, which means both of you can use the full 135cm width without a roll-off feeling at the edge.
- Cooler for two: Two bodies generate more heat than one, so the graphite-infused latex layer earns more of a role here, drawing warmth away from the surface.
- A footprint most bedrooms can take: At 4ft 6in x 6ft 3in, it leaves room for wardrobes and bedside tables where a UK king would start to dominate.
- Medium firm support across the whole surface: Pocket springs respond to each sleeper independently, so a heavier partner settling in shouldn't tilt the lighter one towards the middle.
- Easy to dress: Double bedding is stocked everywhere at every price, although the 40cm depth means you'll want deep fitted sheets.
This size suits you if...
You share the bed every night and want the traditional couples' size rather than something that swallows the room, your bedroom measures around 2.6m x 2.8m or a little more, or you sleep alone and want proper space to spread out, perhaps with a dog or cat claiming a corner.
Consider another size if...
You and your partner regularly wake each other, or one of you is tall. We'd recommend the UK king instead: it's 15cm wider and 10cm longer than the UK double, and we suggest a room of at least 2.7m x 2.9m for it.
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Is the Kaymed Smart Latex 3500 UK double big enough for a couple?
Yes, for most couples. At 135 x 190cm you get 67.5cm each for two people sharing, and the foam encapsulated edges mean that width is usable right to the sides. If either of you is a restless sleeper or over about 6ft, the UK king is the more comfortable long-term choice.
Does the UK double Kaymed Smart Latex 3500 actually have 3500 springs?
No. The 3500 spring count is based on the kingsize, so the UK double contains fewer. The spring density and the feel stay consistent, though: you're getting the same medium firm support and the same 75mm latex layer, just across a 135cm width rather than a 150cm one.
What room size do I need for the Kaymed Smart Latex 3500 in a UK double?
We suggest at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allows the door to open fully and, in most layouts, leaves enough clearance for bedside tables on both sides. If your room is meaningfully bigger, the UK king becomes worth considering.
Will standard double fitted sheets fit the Kaymed Smart Latex 3500 UK double?
Standard double sheets are the right width and length for the 135 x 190cm surface, but this mattress is 40cm deep, which is taller than many sheets are cut for. Look for deep or extra-deep fitted sheets and check the stated depth before you buy. A 200 x 200cm double duvet suits it.
Should I choose the UK double or the UK king in the Kaymed Smart Latex 3500?
The UK double is 15cm narrower and 10cm shorter than the UK king. Choose the UK double if your room is close to our 2.6m x 2.8m minimum or you want space around the bed. Sizing up suits taller sleepers and couples who disturb each other, provided the room allows at least 2.7m x 2.9m.