Kaymed Smart Phase 2000 Pocket Hybrid 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
£758
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At 32cm deep, the Kaymed Smart Phase 2000 Pocket Hybrid is a substantial hybrid with a soft to medium feel, which means noticeable cushioning at the surface rather than a firm, flat sleeping platform. It comes in UK Single, Double, King and Super King sizes. If you sleep warm and prefer a gentler, more cradling feel, it's a sensible shortlist candidate, although those who like a firmer mattress should look elsewhere.
Mattress specifications
Firmness
Medium Soft
Type
Hybrid
Depth (cm)
32
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£758 to £1,358
Best Sleeping Position(s)
Side 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?
Temperature is the headline here. The Smart Phase foam uses patented phase-change crystals that absorb and release body heat, combined with copper and microbeads, which means the surface should feel less prone to overheating than standard memory-style foams. Beneath that, 2,000 pocket springs (based on the kingsize) sit in individual fabric pockets, giving supportive bounce and helping the mattress respond to each sleeper separately. Kaymed is a National Bed Federation Approved Brand and the mattress conforms to BS7177: 2008 fire safety standards for home use. The soft to medium feel won't suit everyone, but for side sleepers and hot sleepers wanting pressure relief with proper spring support, it's a well-judged combination.
Key features & 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.
Best suited for?
Warm sleepers
The Smart Phase foam uses phase-change crystals, copper and microbeads to absorb and release body heat, so the surface should feel less prone to overheating.
Side sleepers
A soft to medium feel with 85mm of Smart Phase foam gives noticeable cushioning at the surface, which suits shoulders and hips sinking in gently.
Couples
With 2,000 pocket springs (based on the kingsize) each in its own fabric pocket, the bed responds to each sleeper separately instead of shifting as a whole.
Lighter sleepers
The soft to medium feel gives a gentler, cradling surface, which means lighter bodies should get the cushioning without sinking too far into the mattress.
If you prefer a firm mattress, or you're a heavier back or stomach sleeper who needs a more resistant surface, the soft to medium feel here may let you sink further than is comfortable.
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 Phase 2000 Pocket Hybrid Mattress
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FAQ's
Is the Kaymed Smart Phase 2000 soft or firm?
The product page describes it as soft to medium. In practice that means a gentler, more cradling surface than a standard medium, which suits side sleepers and lighter builds well, although those who want firm support may find it a little too yielding.
Does the Kaymed Smart Phase 2000 come with a trial?
Mattress Online offers a 100-night trial, but it requires purchasing a mattress protector from them. This is the retailer's own offer rather than a Kaymed policy, so check the terms at the point of purchase.
How many springs does the Kaymed Smart Phase 2000 have?
It has 2,000 pocket springs, a figure based on the kingsize mattress, so smaller sizes will contain fewer. Each spring sits in its own fabric pocket, which means better independent movement and less partner disturbance than open-coil designs.
What guarantee does the Kaymed Smart Phase 2000 have?
The retailer listing states a 5-year manufacturer's guarantee, with an additional 5-year guarantee that includes a usage charge where applicable. As this is stated on Mattress Online's listing, it's sensible to confirm the exact terms before you buy.
How deep is the Kaymed Smart Phase 2000 mattress?
It's 32cm deep, which is on the deeper side, so check that your fitted sheets can accommodate it. The depth comes from the 85mm Smart Phase foam layer sitting above the full pocket spring core, topped with a tensile knitted fabric cover.
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