Millbrook Baroness Natural Wool Mattress
The Millbrook Baroness Natural Wool Mattress is a medium firm natural mattress built around sustainably sourced Hampshire wool, fine English cotton and 7-zone pocket springs, which means cushioned comfort with slightly firmer support where your hips and back need it.
- Natural wool helps regulate temperature
- 7-zone support, softer at shoulders
- Suits side & back sleepers
£399
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The Millbrook Baroness is 25cm deep and sits at the accessible end of natural mattresses, and Millbrook is an NBF-approved manufacturer, so the fillings and construction have been independently audited. It comes in six sizes, including EU Double and EU King, which is handy if you have a continental bed frame.
Mattress specifications
Firmness
Medium Firm
Type
Natural Mattress
Depth (cm)
25
Number of Layers
4
Trial Period (nights)
Warranty (years)
10
Price Range
£399 to £699
Best Sleeping Position(s)
Back Sleeping
Stomach Sleeping
Combination Sleeping
Certifications
BS 7177
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
If you like the idea of natural fillings without a steep price, this is a sensible place to start. The Hampshire wool is naturally breathable and cushioning, which means it helps regulate temperature rather than trapping heat the way some synthetic foams can, and the wool tufts hold the fillings in place so the surface stays even over time. The pocket springs are arranged in a 7-zone system, softer at the shoulders and firmer at the hips, which suits side and back sleepers who want a medium firm feel with a little give up top. The page at MattressNextDay lists a Millbrook Beds 10-year warranty, which is reassuring at a mid-range starting price.
Key features & layer details
Sleep Surface
A Belgian damask viscose cover that feels silky and soft to the touch. It's highly breathable, which means a fresher sleeping environment through the night.
Comfort Fillings
Sustainably sourced Hampshire wool sits beneath the cover, giving a cosy, cushioning feel. Wool is known for its durability and elasticity, so this layer should keep its shape well.
Comfort Fillings
A layer of fine English cotton, spun and crafted in the North West of England. Cotton adds softness and helps the mattress breathe.
Support System
7-zone ergonomic pocket springs, up to 1000 individually responsive springs in a king size, with the count varying by size. The zoning gives softer comfort at the shoulders and firmer support at the hips and back, which means better spinal alignment for most sleepers.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Side sleepers
The 7-zone pocket springs are softer at the shoulders and firmer at the hips, which gives a medium firm feel with some give where side sleepers need it.
Back sleepers
Firmer support at the hips and back from the zoned pocket springs, with a little give in the wool-topped surface, suits a medium firm feel lying flat.
Warm sleepers
Hampshire wool is naturally breathable and the Belgian damask viscose cover is highly breathable too, which means heat is less likely to build up overnight.
European bed frames
Six sizes are offered, including EU Double and EU King, which means you can fit it to a continental bed frame without hunting for a different mattress.
Eco-conscious buyers
Sustainably sourced Hampshire wool and English cotton fill the mattress, and Millbrook is an NBF-approved manufacturer, so the fillings and construction have been independently audited.
If you prefer a very soft, sink-in feel, the medium firm rating and zoned springs may feel a little supportive for your taste. Equally, if a sleep trial matters to you, be aware the retailer listing we sourced doesn't mention one, so check before you buy.
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 Baroness Natural Wool Mattress
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Did you know? On Mattress Unboxed we have over 1,000 different mattresses to suit all types of sleepers. View all mattresses.
FAQ's
Is the Millbrook Baroness mattress firm or soft?
It's rated medium firm, with a 7-zone pocket spring system that's softer at the shoulders and firmer at the hips and back. The wool and cotton fillings add cushioning on top, so it feels supportive rather than hard. Lightweight side sleepers who like a plush surface may find it slightly too firm.
Does the Millbrook Baroness come with a warranty?
The MattressNextDay listing states a Millbrook Beds 10-year warranty. It's sensible to confirm the warranty terms with whichever retailer you buy from, as cover details can differ between sellers.
What is the Millbrook Baroness mattress made of?
It uses sustainably sourced Hampshire wool, fine English cotton and a Belgian damask viscose cover, with natural wool tufts holding the fillings in place. Support comes from a 7-zone pocket spring system. Millbrook is an NBF-approved manufacturer and the mattress meets the BS7177: 2008 fire safety standard for domestic use.
How deep is the Millbrook Baroness mattress?
It's 25cm deep, a fairly standard depth that most fitted sheets will accommodate comfortably.
What sizes does the Millbrook Baroness come in?
Six sizes: UK Single, UK Double, UK King, UK Super King, plus EU Double and EU King for continental bed frames. Note the spring count varies by size, with up to 1000 pocket springs in a king.
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