Kaymed Smart Phase 2000 Pocket Hybrid Double Mattress
The Kaymed Smart Phase 2000 Pocket Hybrid pairs an 85mm layer of Smart Phase foam, infused with phase-change crystals plus copper and microbeads to help regulate temperature, with a core of 2,000 pocket springs (a count based on the kingsize).
- Phase-change foam for hot sleepers
- Soft pressure relief for side sleepers
- Supportive bounce from pocket springs
£1,019
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Kaymed Smart Phase 2000 Pocket Hybrid Mattress
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Mattress details
Mattress
Kaymed Smart Phase 2000 Pocket Hybrid Mattress
Size
Firmness
Medium Soft
Construction
Foam
Pocket Spring
Hybrid
Depth (cm)
32
Layers
2
Layer Details
Smart Phase foam
An 85mm layer of Smart Phase foam infused with patented phase-change crystals, which absorb and release body heat as you sleep. Copper and microbeads are added to the mix to further promote temperature regulation, so hot sleepers should feel the benefit most.
Pocket springs
A core of 2,000 pocket springs, each secured in its own fabric pocket, which means the springs move independently and respond to your body rather than the whole bed shifting. The sturdy spring material is designed for supportive bounce and durability.
Layer details from mattressonline.co.uk product page, September 2026.
Key benefits
- Cooling matters more when you share: Two bodies warm a bed faster than one, so the phase-change crystals, copper and microbeads in the Smart Phase foam do their most useful work in a shared UK double.
- Springs that ignore your partner: The pocket springs move independently, which means one of you turning over at 3am is far less likely to wake the other on a shared 135cm width.
- A footprint most rooms can take: At 135 x 190cm it fits comfortably where a UK king would dominate, usually leaving space for bedside tables on both sides.
- Soft cradle at a shareable size: The medium soft feel gives side sleepers noticeable cushioning at the surface, and in a UK double both partners get that same gentle contouring.
- Bedding is easy and cheap to find: Double sheets and 200 x 200cm duvets are stocked everywhere at every price, so dressing this mattress costs less effort than the less common sizes.
This size suits you if...
You're a couple in a typical UK bedroom and want the traditional shared size, you sleep warm together and need a surface that sheds heat rather than trapping it, or you're a solo sleeper who likes space to spread out, perhaps with a dog or cat claiming a corner. It also suits a guest room that hosts visiting couples, since the medium soft feel is forgiving for most side sleepers.
Consider another size if...
You and your partner both like room to sprawl, or one of you is a restless sleeper and 67.5cm each feels tight. We'd recommend the UK king instead, which is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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FAQ's
Is the Kaymed Smart Phase 2000 in a UK double big enough for a couple?
Yes, for most couples. At 135 x 190cm you get 67.5cm each for two people sharing, which has been the UK standard for decades. The pocket springs respond to each sleeper separately, so you're less disturbed by movement, although if either of you is tall or sprawls, the UK king gives 15cm more width and 10cm more length.
What size room do I need for the Kaymed Smart Phase 2000 UK double?
We suggest allowing at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That leaves space to walk round the bed and, in most rooms, fit bedside tables on both sides. If you're furnishing a second bedroom or first flat with a wardrobe and drawers as well, measure carefully before committing.
What are the dimensions of the Kaymed Smart Phase 2000 UK double?
It measures 135 x 190cm, or 4ft 6in x 6ft 3in. That's 15cm wider than the UK small double at the same length, so it's a genuine step up for sharing rather than a squeeze. Standard double sheets and a 200 x 200cm double duvet fit it, and both are stocked everywhere.
Should a couple choose this mattress in a UK double or a UK king?
It depends on your room. The UK double is 15cm narrower and 10cm shorter than the UK king, and we suggest at least 2.7m x 2.9m for the UK king against 2.6m x 2.8m for the UK double. If your bedroom sits between those figures, the UK double keeps the room usable; if you have the space, the UK king is more comfortable for two.
Is the UK double Kaymed Smart Phase 2000 a good choice for one person?
Yes, if you like room to spread out. Solo sleepers get the full 135cm width to themselves, which leaves plenty of space even with a dog or cat claiming a corner. The medium soft feel cradles side sleepers well, and the UK double is 45cm wider than the UK single at the same length, so the upgrade is substantial.