Mlily Haluna Natural Pocket 4000 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
£699.43
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The Mlily Haluna Natural Pocket 4000 is a 30cm deep hybrid with a quilted wool and bamboo memory foam cover, foam comfort layers and double-decked pocket springs. It's rated medium, so it suits sleepers who want a balance of cushioning and support. It comes in a UK double, UK king and UK super king, arrives vacuum packed in a roll, and Archers Sleepcentre offers a 42-night trial. Mlily gives a 5-year guarantee.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
30
Number of Layers
5
Trial Period (nights)
42
Warranty (years)
5
Price Range
£699 to £954
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Side Sleeping
Certifications
Assessed from Mlily's published specification for this mattress, captured October 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
A medium feel is a safe middle ground for many sleepers, with cushioning on top and support underneath. The Bamboo Air Memory Foam layer is ventilated to encourage airflow, which should help if you tend to feel warm. Flex Comfort Foam adapts to your body contours, while the double-decked pocket springs give all-over contoured support. It's single sided, so there's no flipping, and the Airtech border with F-Joint edge support is there to keep the sides stable. It suits most back and side sleepers, although those who like a very firm bed may want more.
Key features & 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.
Best suited for?
Side sleepers
Flex Comfort Foam adapts to your body contours and the quilted cover feels plush, so there is cushioning where shoulders and hips press in.
Back sleepers
Double-decked pocket springs give all-over contoured support, while the medium feel keeps a balance of cushioning on top and support underneath.
Warm sleepers
The Bamboo Air Memory Foam layer is ventilated to encourage airflow, so you are less likely to feel trapped heat through the night.
Couples
Available in UK double, king and super king, with an edge support system called F-Joint that keeps the sides stable when you both sleep near the edge.
If you prefer sleeping on a firm mattress, this might not be the best choice. It's rated medium, and the quilted wool and memory foam cover adds a plush feel on top. It's also single sided, so you can't flip it, and it only comes in a UK double, UK king and UK super king, so smaller beds are out.
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.
Mlily Haluna Natural Pocket 4000 Mattress in a Box
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FAQ's
How firm is the Mlily Haluna Natural Pocket 4000?
It's rated medium. That should suit most back and side sleepers who want a balance of cushioning and support, although anyone who likes a firm mattress may find it too soft.
What sizes does the Mlily Haluna Natural Pocket 4000 come in?
It comes in a UK double (135 x 190cm), a UK king (150 x 200cm) and a UK super king (180 x 200cm). There's no single or small double option.
How deep is the Mlily Haluna Natural Pocket 4000?
It's 30cm deep. That depth is made up of a quilted cover, memory foam and comfort foam layers, double-decked pocket springs and a support foam base.
Is the Mlily Haluna Natural Pocket 4000 good for hot sleepers?
It has features aimed at heat, including a ventilated Bamboo Air Memory Foam layer that encourages airflow. It also has memory foam and a wool cover, so very hot sleepers should use the trial to check it feels right.
Does the Mlily Haluna Natural Pocket 4000 come with a trial or guarantee?
Archers Sleepcentre offers a 42-night trial, and Mlily gives a 5-year guarantee. The trial is the retailer's own offer, so check its conditions before you order.
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