Millbrook Wool Sublime Pocket 4000 Mattress
The Millbrook Wool Sublime Pocket 4000 Mattress combines natural wool, silk and cotton fillings over pocket springs with a hand-tufted finish, which means a medium-to-firm feel that's built to be flipped and rotated.
- Natural wool, silk & cotton fillings
- Flip & rotate to even out wear
- Hand-tufted for lasting shape
£431.82
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The Millbrook Wool Sublime Pocket 4000 is a pocket spring mattress filled with Hampshire wool, cashgora wool, silk and English spun cotton, under a viscose cover. Millbrook describes the feel as medium to firm, so it suits sleepers who like proper support. It's 31cm deep and comes in a UK small single, UK single, UK small double, UK double, UK king and UK super king. Archers Sleepcentre offers a 42-night comfort trial.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
31
Number of Layers
Trial Period (nights)
Warranty (years)
Price Range
£431 to £822
Best Sleeping Position(s)
Back Sleeping
Combination Sleeping
Stomach Sleeping
Certifications
Assessed from the specification published by archerssleepcentre.co.uk, captured October 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you want natural fillings and a supportive feel, this is a sound choice. Hampshire wool, cashgora wool, silk and English spun cotton make up the fillings, and air vents are included for airflow, which should help the mattress feel fresher. It's double sided, so you can flip and rotate it to spread wear. The hand tufted finish and hand side-stitched border point to careful construction. It suits most back sleepers, although very light side sleepers may find it a little firm. The retailer also lists a 10-year guarantee.
Key features & layer details
We’re still collecting information on this mattress. Unfortunately, we don’t have its key features yet.
Best suited for?
Back sleepers
A medium to firm feel with pocket springs gives proper support, which suits most people who spend the night lying on their backs.
Eco-conscious buyers
Natural fillings of Hampshire wool, cashgora wool, silk and English spun cotton mean you get a mattress built from natural materials rather than synthetic ones.
Warm sleepers
Air vents are built in for airflow, which should help the mattress feel fresher and less stuffy through the night.
Couples
Available in UK double, king and super king, it gives two people room to spread out on a supportive pocket spring base.
If you prefer sleeping on a soft mattress, this might not be the best choice. It's rated medium to firm, so lighter side sleepers who want a plush, sink-in feel may find it too supportive. It's also a mattress you'll need to turn: being double sided means regular flipping and rotating, which isn't ideal if you'd rather not lift it.
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.
Millbrook Wool Sublime Pocket 4000 Mattress
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FAQ's
How firm is the Millbrook Wool Sublime Pocket 4000?
Millbrook describes it as medium to firm. That suits back sleepers and anyone who likes firm support, although lighter side sleepers who want a softer surface may find it a little unyielding.
What sizes does the Millbrook Wool Sublime Pocket 4000 come in?
It comes in a UK small single, UK single, UK small double, UK double, UK king and UK super king. The UK king is 150 x 200cm and the UK super king is 180 x 200cm.
How deep is the Millbrook Wool Sublime Pocket 4000?
It's 31cm deep. That's a substantial mattress, so check your bed frame and bedding suit that depth before you order.
What is the Millbrook Wool Sublime Pocket 4000 made of?
It's a pocket spring mattress with Hampshire wool, cashgora wool, silk and English spun cotton fillings, under a viscose cover. It also has air vents for airflow and a hand side-stitched border.
Can you flip the Millbrook Wool Sublime Pocket 4000?
Yes, it's double sided, so you can both flip and rotate it. Doing so regularly helps spread wear, although it does mean lifting a 31cm deep mattress.
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