Firmness
Medium Soft
Type
Hybrid
Depth (cm)
32
Number of Layers
2
Trial Period (nights)
100
Warranty (years)
5
Price Range
£799 to £1,449
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.
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 & what's inside
- 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.
Who's it NOT for?
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. It's also stocked by only one retailer, so you can't shop around on price.
Kaymed Smart Phase 2000 Pocket Hybrid Mattress
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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, currently the only listed retailer, 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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