Firmness
Medium Firm
Type
Hybrid
Depth (cm)
32
Number of Layers
7
Trial Period (nights)
100
Warranty (years)
5
Price Range
£594 to £1,168
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
This mattress makes sense if you want natural materials without giving up spring support. The wool, silk and cashgora fillings help regulate temperature, and the graphite latex adds an adaptive, springy feel that shapes to your body. Underneath, 1,000 pocket springs with a 7-zone ergonomic design sit alongside 3,000 mini springs, which means firmer support where your body is heaviest and a little extra give elsewhere. Millbrook's Ultra Edge system, a rod wire frame with butterfly clips, keeps the sides usable, helpful if you share a bed or sit on the edge to get dressed. Millbrook is a National Bed Federation Approved Brand, which offers some reassurance about how the mattress is made.
Key Features & what's inside
- Damask cover. A finely woven damask cover that is soft to the touch. Damask is a durable fabric, so it should hold up well over years of use.
- Natural fibre comfort layer. A blend of Hampshire wool, silk and cashgora gives a plush, cosy surface feel. Wool and silk are naturally breathable, which helps with temperature regulation.
- Cotton blend comfort layer. A cotton and polyester blend adds further breathability. In practice, this means less heat building up around you overnight.
- Graphite latex. A layer of graphite latex foam that shapes around your body while keeping a natural bounce. It is highly adaptive, so it contours without the slow, stuck-in feel some foams have.
- Pocket spring support core. A core of 1,000 pocket springs with a 7-zone ergonomic design that adapts to your movement. Zoning means different areas of the mattress respond differently, supporting hips and shoulders where they need it.
- Mini springs. 3,000 mini springs sit within the mattress to add bounce and increase comfort. Combined with the pocket spring core, that brings the total to 4,000 springs.
- Ultra Edge support. A rod wire frame with butterfly clips forms Millbrook's Ultra Edge system. This firms up the perimeter, so you can sleep near the edge without feeling you might roll off.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a firm mattress, the medium feel here may be softer than you want. Anyone avoiding synthetic materials should know the comfort layers include polyester alongside the natural fibres. And if you like a slow, cradling memory foam feel, the bouncy latex will feel quite different.
Millbrook Wool Luxury Latex 4000 Pocket Mattress
How firm is the Millbrook Wool Luxury Latex 4000 mattress?
Millbrook describes it as medium, although some retailer listings label it medium firm. A medium feel suits most sleeping positions, with the latex and wool layers softening the surface while 4,000 springs provide support underneath. If you want a distinctly firm bed, this is likely to feel softer than you expect.
Does the Millbrook Wool Luxury Latex 4000 come with a trial?
MattressOnline, the retailer listing this mattress, 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.
How many springs does the Millbrook Wool Luxury Latex 4000 have?
It has 4,000 springs in total: a core of 1,000 pocket springs with a 7-zone ergonomic design, plus 3,000 mini springs that add bounce and comfort. Each pocket spring moves independently, which means less motion transfer between you and a partner.
How deep is the Millbrook Wool Luxury Latex 4000 mattress?
It is 32cm deep, which is a generously deep mattress. Check that your fitted sheets are made for deeper mattresses, as standard ones can be a tight fit at this depth.
What guarantee does the Millbrook Wool Luxury Latex 4000 have?
The MattressOnline listing states a 5 year guarantee, and its specification section confirms 5 years. The page also mentions a further warranty period beyond that, so it is sensible to confirm the exact cover with the retailer before you buy.
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