Firmness
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)
Certifications
Assessed from the specification published by MattressNextDay, captured September 2026, and from regular price comparison across our UK retail partners.
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 & what's inside
- 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.
Who's it NOT for?
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.
Millbrook Duke Natural Silk Mattress
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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. Prices range from £449 to £799 depending on size.
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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