Kaymed Heavy Sleeper 1200 Pocket Hybrid Mattress
Mattress
Kaymed Heavy Sleeper 1200 Pocket Hybrid Mattress
Size
Firmness
Firm
Construction
Depth (cm)
33
Layers
3
Layer Details
- Knitted cover. A soft knitted finish that adds a touch of cosiness and warmth on the surface. It's designed to help with airflow and breathability too, which matters on a firmer mattress where you sleep more on top than in it.
- Reflex Foam. A layer of high density reflex foam that supports spinal alignment, which means your back stays in a healthier position through the night. It's firm and durable rather than plush, so expect a solid feel from the first night.
- Pocket Springs. 1,200 individual springs, each encased in its own cloth pocket, adapt to your movement independently. That gives personalised support to different parts of your body and helps limit motion transfer from a partner.
Layer details from mattressonline.co.uk product page, September 2026.
- 90cm each, every night: Two people sharing get 90cm each, so a partner who turns frequently becomes far easier to sleep beside.
- Width plus pocket springs: The 1,200 individually pocketed springs already limit motion transfer, and at this width most movement never reaches your side at all.
- Room for night-time visitors: When a child pads in at 3am, or a large dog treats the bed as routine, 180cm of width means nobody ends up clinging to an edge.
- Firm support across the full surface: The high density reflex foam keeps its solid feel right to the edges, useful when three bodies spread across the mattress.
- A proper presence in a large room: At 6ft x 6ft 6in with a 33cm depth, it fills a big master bedroom where a UK king can look undersized.
This size suits you if...
You share the bed every night with a restless partner and want distance rather than hoping a comfort layer absorbs the movement, your children or pets regularly join you and everyone still needs a fair share of the surface, or you have a large master bedroom and prefer a firm, substantial mattress that suits the space.
Consider another size if...
Your bedroom is smaller than the 3m x 2.9m we suggest for this size, or you sleep alone. We'd recommend the UK king instead: it's 30cm narrower, the same length, and needs a room of at least 2.7m x 2.9m.
Similar Mattresses in This Price Range
Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
What room size do I need for the Kaymed Heavy Sleeper 1200 in a super king?
We suggest a room of at least 3m x 2.9m. That allows walking space on both sides and around the foot of the bed, plus space for doors and drawers to open. In a tighter room the mattress will dominate, and its 33cm depth adds visual bulk too, so measure before committing.
How much space does each person get on this super king?
Two people sharing get 90cm each, the most of any standard UK size. Combined with the 1,200 pocket springs, which respond to each sleeper independently, movement on one side rarely carries across. If children or pets join you, the extra width over a UK king is what keeps everyone comfortable.
Is the super king much bigger than the UK king version?
The UK super king is 30cm wider than the UK king, and both are the same length at 200cm. That 30cm sounds modest but it's the difference between two sleepers having generous personal space and merely adequate space, especially if anyone else shares the bed at night.
Will a super king Kaymed Heavy Sleeper 1200 fit up the stairs?
This is the trickiest size to move: a 180 x 200cm mattress at 33cm deep, with springs and dense reflex foam that resist folding. Measure your stairwell, landing turns and door swings before ordering. Kaymed doesn't publish a weight for this mattress, so allow two people for the move.
What bedding fits this mattress in a super king?
You'll need super king fitted sheets, and check they're rated for deep mattresses since this one is 33cm deep; standard-depth sheets may not tuck under securely. A 260 x 220cm duvet is the usual pairing. Bedding at this size costs more than king equivalents, so factor that into your budget.