Kaymed Smart Phase 1600 Pocket Hybrid Mattress
Mattress
Kaymed Smart Phase 1600 Pocket Hybrid Mattress
Size
Firmness
Medium Firm
Construction
Depth (cm)
27
Layers
3
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.
- Shared warmth, managed: Two bodies under one duvet raise the surface temperature quickly, and the Smart Phase foam layer works to move that heat away rather than store it.
- Less partner disturbance at this width: With 67.5cm each for two people sharing, the independent pocket springs matter, flexing under one sleeper without tilting the other.
- Fits rooms a UK king would crowd: At 135 x 190cm it leaves space for bedside tables on both sides in most bedrooms, where a wider size often forces a choice.
- Usable right to the edge: The foam encapsulated border keeps the sides supportive, which counts when two of you are sharing a modest width.
- Guest room friendly: The medium firm feel is a safe middle ground for visiting couples with different preferences, and the double is the natural spare room size.
This size suits you if...
You share the bed every night and your room sits comfortably within our suggested 2.6m x 2.8m minimum, you want temperature control without moving up to a bigger, pricier size, or you're kitting out a guest room that needs to sleep visiting couples properly. It also suits a solo sleeper who likes to spread out, or shares with a dog or cat that claims a corner.
Consider another size if...
You're both average height or taller and find your feet near the edge, or you keep waking each other. The UK king is 15cm wider and 10cm longer; allow at least 2.7m x 2.9m for it.
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Is the Kaymed Smart Phase 1600 double big enough for two hot sleepers?
It's designed for exactly that pairing. Two people sharing get 67.5cm each, which is snug but workable, and the Smart Phase foam absorbs and releases body heat to keep the surface temperature more even. If you both run warm and tend to drift together in the night, the thermoregulating layer helps, though the UK king offers noticeably more personal space.
Will the Kaymed Smart Phase 1600 UK double fit my bedroom?
At 135 x 190cm, we suggest a room of at least 2.6m x 2.8m, with around 3m x 3m the comfortable norm. That allowance leaves walking space and, in most rooms, room for bedside tables on both sides. If yours is smaller, the UK small double is 15cm narrower and the same length; allow at least 2.4m x 2.8m for it.
Should I get this mattress in a UK double or a UK king?
The UK double is 15cm narrower and 10cm shorter than the UK king. If either of you is tall, or one of you is a restless sleeper, that extra width and length is felt every night. The double wins where space or budget is tighter; we suggest at least 2.7m x 2.9m of room before sizing up to the UK king.
Is the double version easy to get up narrow stairs?
A hybrid with 1600 pocket springs and a 27cm depth doesn't fold or roll like an all-foam mattress, so plan the route first. Measure turning points on stairs in older terraces and tight new build landings against the 135 x 190cm footprint. Delivery arrangements vary by retailer, so check with the retailers listed on this page before ordering.
How does this UK double feel for a couple with different sleeping positions?
The medium firm tension suits most back and combination sleepers, and because each of the 1600 pocket springs reacts independently, one of you turning over shouldn't tilt or wake the other. A lightweight side sleeper may find it slightly too solid, though, so if that describes one of you, test the feel carefully before committing to sharing it.