Mlily Haluna Natural Pocket 4000 King Size Mattress in a Box
The Mlily Haluna Natural Pocket 4000 Mattress in a Box combines a wool and bamboo memory foam cover with a ventilated Bamboo Air Memory Foam layer, which means a plush surface that helps you stay comfortable as you sleep.
- Plush wool & bamboo foam cover
- Ventilated layer helps you sleep cooler
- 42-night trial & 5-year guarantee
£805.71
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Mlily Haluna Natural Pocket 4000 Mattress in a Box
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Mattress details
Mattress
Mlily Haluna Natural Pocket 4000 Mattress in a Box
Size
Firmness
Medium
Construction
Foam
Memory Foam
Pocket Spring
Rolled
Wool
Depth (cm)
30
Layers
5
Layer Details
Wool and bamboo memory foam cover
A quilted cover that blends wool with Bamboo Memory Foam, with a stretch knit finish. It gives the surface a plush feel from the first night.
Bamboo Air Memory Foam
A ventilated memory foam layer that encourages airflow through the mattress. That helps regulate body temperature, so you're less likely to feel trapped heat.
Flex Comfort Foam
A responsive foam layer that adapts to your body contours. It adds cushioning where you need it.
Pocket springs
A double-decked 4000 H-Spring system. It gives all-over contoured support, so the mattress responds to your shape across the bed.
Flex Support Foam
A generous base of custom support foam. It supports the layers above from the bottom up.
Layer details from mlily.uk product page, October 2026.
Key benefits
- Room to turn over: Each of you gets 75cm of width, which means 7.5cm more than the UK double and a little more distance when your partner shifts position in the night.
- Length for a taller partner: At 200cm long, the UK king is 10cm longer than the UK double, so someone close to 6ft can stretch out without their feet reaching the end.
- Usable to the edges: The Airtech border with F-Joint edge support is there to keep the sides stable, which means you can sleep nearer the edge and sitting up to get out should feel steadier.
- The same feel on both sides: A medium rating over double-decked pocket springs gives each of you the same balance of cushioning and support across the full 150cm.
- Enough duvet to go round: It takes standard king sheets and a 230 x 220cm king duvet, which helps if one of you tends to drag the covers across in the small hours.
This size suits you if...
You share the bed every night and wake when your partner turns over on a UK double, or one of you is close to 6ft and needs the extra length, and your bedroom gives you at least 2.7m x 2.9m.
Consider another size if...
Your bedroom measures less than 2.7m x 2.9m once the wardrobes are in. We'd recommend the UK double instead, which needs at least 2.6m x 2.8m.
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FAQ's
Is the Mlily Haluna Natural Pocket 4000 UK king big enough for two adults?
For most couples, yes. The UK king gives you 75cm each, which is 7.5cm more each than the UK double. That extra width is useful if one of you gets up hours before the other, as there's slightly more space between you when they climb out.
What size bedroom do I need for a UK king Mlily Haluna?
We suggest at least 2.7m x 2.9m for a UK king, and 3.2m x 3.2m if you want comfortable space to walk round both sides. New build master bedrooms can feel smaller than their plans suggest once fitted wardrobes go in, so measure from the wardrobe doors rather than the walls.
Is the Mlily Haluna UK king long enough if you're nearly 6ft?
The UK king is 200cm long, 10cm longer than the UK double. If one of you is close to 6ft, that length is often the real reason to size up. The UK super king is the same length, so going wider again won't give a taller partner any more legroom.
Should I get the Mlily Haluna in a UK king or a UK super king?
The UK king is 30cm narrower than the UK super king and gives 15cm less each, at 75cm against 90cm. If a dog sleeps on the bed most nights, the UK super king may suit you better, but it needs at least 3m x 2.9m of floor space.
What bedding fits a UK king Mlily Haluna Natural Pocket 4000?
Standard UK king sheets fit the 150 x 200cm surface, and a 230 x 220cm king duvet covers two people comfortably. The mattress is 30cm deep, so check that any fitted sheet you choose is made for a mattress of that depth before you buy it.