Millbrook Wool Luxury 4000 Pocket Mattress
The Millbrook Wool Luxury 4000 Pocket Mattress is a traditionally made, hand-tufted pocket spring mattress handcrafted in the UK, with 4000 pocket springs zoned across 7 areas and natural fillings of Hampshire fleece wool and English cotton.
- Zoned support, firmer at the hips
- Wool & cotton help you stay cooler
- Reinforced edges, no roll-off feeling
£494
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Millbrook describes the Wool Luxury 4000 as medium to firm, which suits back and front sleepers who want steady, even support, although some owners find it firmer than expected. At 28cm deep, it sits in the mid to upper range, and the natural materials and craftsmanship go a long way to justifying that. Mattress Online offers a 100-night trial and a 10-year guarantee on it.
Mattress specifications
Firmness
Medium Firm
Type
Pocket Spring
Depth (cm)
28
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
10
Price Range
£494 to £984
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
This mattress makes sense if you want natural fillings rather than foam. The wool and cotton layers help regulate temperature, which means if you're a hot sleeper you should stay noticeably cooler than on memory foam. The 4000-spring ErgoZone 7 support system varies its firmness across seven zones, so heavier areas like your hips get more resistance while shoulders sink in a little more. Reinforced edges with metal rods and butterfly clips mean you can sit or sleep near the side without feeling like you'll roll off. It's hand-tufted, so expect a slightly dimpled, traditional surface rather than a smooth top. Six sizes are available, from UK Single up to Super King, plus an EU King.
Key features & layer details
Cover
A soft-touch cotton-viscose fabric infused with M-Pure, a 100% natural, plant-based treatment. It's naturally fire resistant, which means no added chemical fire retardants in the cover.
Comfort fillings
Luxury Hampshire fleece wool blended with layers of English cotton, traditionally hand-tufted. Wool and cotton breathe well, so this layer helps keep you at a steadier temperature through the night.
Mini pocket springs
Small, individually cased springs sit near the surface to add comfort and soothing pressure relief. They respond to your shape more precisely than fillings alone would.
Pocket spring support system
4000 pocket springs zoned in 7 areas, an arrangement Millbrook calls ErgoZone 7. Each spring is individually encased and adapts to your movement, which means support that follows your body rather than the whole bed dipping.
Edge support
Metal rods sit above and below the spring unit, held in place with butterfly clips. This reinforces the edges, so you can use the full width of the mattress without the sides sagging.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Back sleepers
The medium to firm feel and zoned pocket springs give steady, even support, which keeps your hips from dipping out of line while you lie flat.
Front sleepers
A medium firm surface with 4000 pocket springs resists sinking in at the middle, so your body stays level rather than curving into the bed.
Warm sleepers
Wool and cotton fillings breathe well and help keep temperature steadier overnight, so you should stay cooler than you would on memory foam.
Eco-conscious buyers
Hampshire fleece wool, English cotton and a plant-based M-Pure cover treatment mean natural fillings and no added chemical fire retardants in the cover.
Couples
Reinforced edges with metal rods and butterfly clips let you use the full width of the bed, so neither of you hugs the middle.
If you like a soft, cushioned surface you sink into, this medium to firm feel will likely be too solid, and some owners report it feels firmer still. It's also a heavy mattress to move, so if you'll be rotating it alone regularly, be prepared, though the turning handles help.
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 Luxury 4000 Pocket Mattress
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FAQ's
How firm is the Millbrook Wool Luxury 4000?
It's described as medium to firm. That suits most back and front sleepers, although some owner reviews mention it feels firmer than a typical medium firm, so lightweight side sleepers may find it a little too solid at the shoulders and hips.
Does the Millbrook Wool Luxury 4000 come with a trial?
Mattress Online offers a 100-night trial. That trial is the retailer's own policy rather than a Millbrook guarantee, so if you buy elsewhere, check that seller's terms before ordering.
What is the Millbrook Wool Luxury 4000 made of?
Natural fillings of Hampshire fleece wool and English cotton sit over mini pocket springs and a 4000-spring zoned support unit. The cover is a cotton-viscose fabric with M-Pure, a plant-based, naturally fire-resistant treatment. It's handcrafted in the UK and hand-tufted in the traditional way.
How deep is the Millbrook Wool Luxury 4000 mattress?
It's 28cm deep. That's a generous depth, so check your fitted sheets will stretch to accommodate it, particularly if you're moving up from a slimmer mattress.
Is there a guarantee on the Millbrook Wool Luxury 4000?
Mattress Online lists a 10-year guarantee with this mattress. As that figure comes from the retailer's listing rather than Millbrook's own site, it's sensible to confirm the guarantee terms with whichever retailer you buy from.
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