Kaymed Smart Phase 1600 Pocket Hybrid Mattress
The Kaymed Smart Phase 1600 Pocket Hybrid is a medium to firm hybrid mattress that pairs pocket springs with Kaymed's Smart Phase foam, a temperature-regulating layer infused with microbeads, copper and phase change crystals, which means it works to move heat away from you rather than trapping it.
- Evens out your sleeping temperature
- Helps keep your spine aligned
- Minimises partner disturbance
£684
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At 27cm deep, the Kaymed Smart Phase 1600 Pocket Hybrid comes in four UK sizes from single to super king. If you sleep warm and want spring support with a slightly firmer feel, it deserves a look, although lighter side sleepers may find it a touch too solid. Kaymed is a National Bed Federation Approved Brand, and the mattress carries a 5-year manufacturer's guarantee.
Mattress specifications
Firmness
Medium Firm
Type
Hybrid
Depth (cm)
27
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
5
Price Range
£684 to £1,128
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination 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?
The main draw here is temperature control. The top layer is 50mm of Kaymed's Smart Phase foam, which absorbs and releases body heat to keep the surface at a more even temperature, useful if you regularly wake up too warm. Beneath that, a reflex foam layer supports spinal alignment, and the pocket springs move independently to shape around your body, which means less disturbance from a restless partner. The medium to firm feel suits most back and combination sleepers. It isn't the cheapest hybrid around, but you're paying for a thermoregulating layer that many hybrids at this level simply don't have, plus a super stretch knitted cover and a foam encapsulated border for edge-to-edge use.
Key features & layer details
Smart Phase Foam
A 50mm layer of Kaymed's exclusive Smart Phase foam, infused with microbeads, copper and phase change crystals. It thermoregulates by moving heat away from the mattress surface, absorbing and releasing body heat to keep you at a comfortable temperature.
Reflex Foam Comfort Layer
A soft, flexible reflex foam that sits between you and the springs. It adds the support needed for good spinal alignment without a hard, boardy feel.
Pocket Springs Support System
1600 pocket springs, based on the kingsize mattress, each housed in its own fabric pocket. They react independently to movement through the night, which means the mattress shapes around your body rather than tilting you towards a partner.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Warm sleepers
The 50mm top layer of Smart Phase foam absorbs and releases body heat, which means a more even surface temperature if you often wake up too warm.
Back sleepers
A medium to firm feel and a reflex foam layer that supports spinal alignment suit lying on your back without a hard, boardy feel.
Combination sleepers
Medium to firm tension with a flexible reflex foam layer gives a balanced feel as you move between positions through the night.
Couples
Each of the 1600 pocket springs sits in its own fabric pocket and moves independently, which means less disturbance from a restless partner.
If you prefer a soft, sink-in feel, the medium to firm tension here will likely feel too solid, and lightweight side sleepers may not press far enough into the comfort layers. It's also fixed-cover rather than removable, so anyone who wants a washable cover should look elsewhere.
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 1600 Pocket Hybrid Mattress
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FAQ's
Is the Kaymed Smart Phase 1600 good for hot sleepers?
That's its main selling point. The top layer is Smart Phase foam infused with microbeads, copper and phase change crystals, designed to move heat away from the surface and absorb and release body heat. If overheating is your usual complaint with foam-topped mattresses, this layer is built to address it.
How firm is the Kaymed Smart Phase 1600?
Kaymed describes it as medium to firm. That suits most back sleepers and heavier side sleepers, though lighter people who sleep on their side may find it slightly too firm for comfortable shoulder and hip cushioning.
Does the Kaymed Smart Phase 1600 come with a trial?
Mattress Online lists a 100-night trial, but be aware this is the retailer's own offer, not Kaymed's, and it requires buying a mattress protector from them. If you purchase elsewhere, the trial terms may differ or not apply at all.
What guarantee does the Kaymed Smart Phase 1600 have?
It comes with a 5-year manufacturer's guarantee. According to the Mattress Online listing, an additional 5-year guarantee is available, with usage charges applying where applicable, so check the small print before relying on the full extended period.
How many springs does the Kaymed Smart Phase 1600 have?
It has 1600 pocket springs, based on the kingsize mattress. Each spring sits in its own fabric pocket and reacts independently, which means the mattress contours to your body and reduces motion transfer between partners.
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