Millbrook Duke Natural Silk Mattress
The Millbrook Duke Natural Silk is a medium-feel pocket sprung mattress, handmade in England by an NBF-approved manufacturer, with a comfort build of natural silk, sustainably sourced Hampshire wool and fine English cotton.
- Silk & wool reduce heat build-up
- 7-zone support keeps your spine level
- Handmade in England
£449
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At 28cm deep, the Millbrook Duke Natural Silk has the substantial feel of a traditional natural mattress, and the price is good value for a handmade natural-fibre bed. Underneath sits a 7-zone ergonomic pocket spring system, up to 1000 individually responsive springs in a king size, which means the springs move independently under you, so a restless partner is less likely to wake you. It suits most sleepers, although anyone wanting a distinctly firm bed should look elsewhere.
Mattress specifications
Firmness
Medium
Type
Pocket Spring
Depth (cm)
28
Number of Layers
5
Trial Period (nights)
Warranty (years)
10
Price Range
£449 to £799
Best Sleeping Position(s)
Side Sleeping
Back 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?
Natural fillings are the draw here. Silk and wool breathe far better than synthetic foams, which means less overnight heat build-up, so if you're a hot sleeper this construction works in your favour. The 7-zone spring system offers softer cushioning at the shoulders and firmer reinforcement through the hips and lower back, which means side sleepers can sink at the shoulder while the spine stays level. It's handmade in England by an NBF-approved manufacturer and meets the BS7177: 2008 low hazard fire standard. The listing at MattressNextDay states a Millbrook Beds 10-year warranty, and that retailer offers free next day delivery. Sizes run from UK Single to Super King, with EU Double and EU King also available.
Key features & layer details
Sleep Surface
A Belgian damask viscose cover that feels silky rather than scratchy against bedding. It's highly breathable, which means moisture escapes rather than lingering, helping the bed feel fresher night after night.
Natural Silk Layer
Silk is lightweight and exceptionally soft, which means a gentle, cushioned first impression when you lie down. It's a genuine luxury filling rather than a marketing flourish.
Sustainably Sourced Hampshire Wool
Wool is naturally elastic and durable, which means the cushioning recovers its shape rather than flattening quickly. It also regulates temperature well, a quiet advantage if you run warm.
Fine English Cotton
Premium English-spun cotton, crafted in the North West of England, adds a soft, breathable comfort layer. Cotton wicks moisture, which means a drier, more comfortable sleeping surface.
Support System
A 7-zone ergonomic pocket spring system with up to 1000 individually responsive springs in a king size, designed to mirror the body's natural contours. Softer cushioning at the shoulders and firmer support through the hips means better spinal alignment, particularly for side sleepers.
Layer details from mattressnextday.co.uk product page, September 2026.
Best suited for?
Side sleepers
The 7-zone spring system gives softer cushioning at the shoulders and firmer support through the hips, so the shoulder can sink while the spine stays level.
Warm sleepers
Silk, wool and cotton all breathe better than synthetic foams, which means less overnight heat build-up and a drier surface if you tend to run hot.
Couples
Up to 1000 individually responsive springs in a king size move independently under you, so a restless partner is less likely to wake you.
Budget buyers
The copy calls it good value for a handmade natural-fibre bed, so you get a 28cm deep, five-layer mattress without paying for a premium label.
Eco-conscious buyers
Sustainably sourced Hampshire wool, English cotton and silk make up the fillings, which means a natural construction handmade in England rather than one built on synthetic foams.
This is a medium-feel mattress, so heavier sleepers or anyone who prefers a properly firm surface may find it a little too yielding. It contains wool and silk, so it isn't suitable if you want a fully animal-free bed. And if memory foam's slow, hugging sink is what you love, this springier natural feel will disappoint.
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 Duke Natural Silk Mattress
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FAQ's
How firm is the Millbrook Duke Natural Silk mattress?
It's listed as medium. That suits most back and side sleepers, offering a balance of cushioning and support, although lightweight side sleepers may find it slightly firmer than expected, and heavier stomach sleepers may want something firmer.
How many springs does the Millbrook Duke Natural Silk have?
It uses a 7-zone ergonomic pocket spring system with up to 1000 individually responsive springs, and that figure is specified for the king size. Smaller sizes will contain fewer springs, which is normal, as spring counts scale with mattress area.
Does the Millbrook Duke Natural Silk come with a warranty?
The MattressNextDay listing states a Millbrook Beds 10-year warranty. If you're buying elsewhere, it's sensible to confirm the warranty terms with that retailer before ordering.
What sizes does the Millbrook Duke Natural Silk come in?
Six sizes: UK Single, UK Double, UK King and UK Super King, plus EU Double and EU King, which is handy if you have a continental bed frame.
Is the Millbrook Duke Natural Silk good for hot sleepers?
It's a strong choice. Silk, Hampshire wool and English cotton all breathe and manage moisture better than synthetic foams, and the viscose sleep surface is highly breathable too, which means less heat trapped around you overnight.
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