Millbrook Baroness Natural Wool Single 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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Millbrook Baroness Natural Wool Mattress
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Mattress details
Mattress
Millbrook Baroness Natural Wool Mattress
Size
Firmness
Medium Firm
Construction
Wool
Natural
Depth (cm)
25
Layers
4
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.
Key benefits
- Fits where bigger beds won't: At 3ft wide, this single leaves room for a wardrobe, a desk and toy storage in a child's bedroom, or two beds plus a walkway in a shared one.
- Natural fillings for a growing sleeper: Hampshire wool breathes rather than trapping heat, which matters for children and teens who tend to run warm at night.
- Zoned support in a one-person size: The 7-zone pocket springs give softer comfort at the shoulders and firmer support at the hips, so a solo sleeper gets proper alignment across the whole 90cm.
- A guest bed that doesn't feel like one: In a spare room that doubles as an office, a medium firm natural mattress gives visitors a comfortable night without dominating the space.
- Cheap, easy bedding: Standard single sheets and a 135 x 200cm single duvet fit, and both are the most widely stocked bedding of any UK size.
This size suits you if...
You're buying for a child's or teenager's room where the bed shares space with a desk and storage, you sleep alone and want natural fillings in a room where anything wider would crowd the floor, or you're furnishing a spare room or first flat and need the standard one-person size that fits almost any frame.
Consider another size if...
You're an adult who shares the bed regularly, or you simply want more stretching room than 90cm allows. We'd recommend the UK double instead, which is 45cm wider and the same length; allow at least 2.6m x 2.8m of floor space for it.
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FAQ's
What size is the Millbrook Baroness UK single?
It measures 90 x 190cm, or 3ft x 6ft 3in, the standard UK one-person size. We suggest allowing at least 2.1m x 2.8m of floor space so you can walk round the bed comfortably. That modest footprint is why the single works in box rooms, loft conversions and shared children's bedrooms.
Is the Millbrook Baroness single a good mattress for a child?
The natural fillings are a sensible fit for children and teens: Hampshire wool helps regulate temperature, and the medium firm feel with zoned springs supports a growing back rather than letting it sag. A very light child may find it a little firm at first, but for most it's a supportive choice.
Will the Millbrook Baroness single fit a bunk or mid sleeper frame?
The 90 x 190cm footprint matches standard UK bunk and mid sleeper frames. The mattress is 25cm deep, which is on the deeper side for a raised bed, so check your frame's maximum mattress depth and guard rail height before buying. On the top bunk especially, the rail needs to sit well above the mattress surface.
Is a UK single big enough for an adult guest?
For occasional guests, yes. At 90cm wide it gives one adult a comfortable night, and in a spare room that also serves as an office it leaves space for a desk. If guests stay often and you have the room, the UK small double is 30cm wider and the same length, needing at least 2.4m x 2.8m.
How supportive is the single compared with the larger sizes?
The feel is the same medium firm across the range, but the pocket spring count varies by size, rising to as many as 1000 in a king. The single still uses the 7-zone layout, so a solo sleeper gets softer comfort at the shoulders and firmer support at the hips, just with fewer springs across the narrower width.