Millbrook Smooth Tech Ultra 10000 Pocket Mattress
The Millbrook Smooth Tech Ultra 10000 is a pocket spring mattress with a soft to medium feel, which means it suits sleepers who want gentle cushioning rather than a firm surface.
- Softer feel suits side sleepers
- Contours closely to shoulders & hips
- Natural fibres reduce heat build-up
£944
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Inside the Millbrook Smooth Tech Ultra 10000 sit 2,000 regular pocket springs paired with 8,000 mini springs, each stitched into its own fabric pocket, so the surface can respond to pressure point by point rather than as one flat sheet. Natural fillings of wool, silk, cashgora and cotton sit above the springs, and the whole thing is handcrafted in the UK. At 35cm deep it's a substantial mattress. It's a real investment, but the materials go some way to justifying it.
Mattress specifications
Firmness
Medium Soft
Type
Pocket Spring
Depth (cm)
35
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
10
Price Range
£944 to £1,338
Best Sleeping Position(s)
Side Sleeping
Certifications
BS 7177
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
Why should you choose this mattress?
Choose this one if you like a softer sleep surface with proper support underneath. The combination of full-size and mini pocket springs means the mattress can contour closely to your shoulders and hips, which is a genuine plus for side sleepers. The natural comfort layer of wool, silk, cashgora and cotton helps regulate temperature, so if you tend to sleep warm it should feel less clammy than a synthetic foam top. It's approved by the National Bed Federation and conforms to BS7177 fire safety standards.
Key features & layer details
Microquilted Cover
A micro-quilted cover gives the mattress a smooth, soft finish. It's the first thing you'll feel through your sheet, and it sets the gentle tone for the layers beneath.
Comfort Layer
A blend of wool, silk, cashgora and cotton designed for a cloud-like feel. These natural fibres also breathe well, which means less overnight heat build-up than synthetic alternatives.
Pocket Springs Support System
2,000 regular pocket springs work alongside 8,000 mini springs, each stitched into its own individual fabric pocket. Because every spring moves independently, the mattress can relieve pressure where you need it rather than pushing back uniformly.
Layer details from mattressonline.co.uk product page, September 2026.
Best suited for?
Side sleepers
Full-size and mini pocket springs contour closely to the shoulders and hips, so the medium soft feel eases into your curves on your side.
Warm sleepers
A comfort layer of wool, silk, cashgora and cotton breathes well, which means less overnight heat build-up than a synthetic foam top.
Lighter sleepers
The medium soft feel and independently moving springs respond point by point, so a lighter body can sink in gently without being pushed back.
Eco-conscious buyers
Natural fillings of wool, silk, cashgora and cotton sit above the springs, and the whole mattress is handcrafted in the UK.
If you prefer a firm mattress, or you're a heavier sleeper who needs a more resistant surface to keep your spine aligned, the soft to medium feel here may let you sink further than is comfortable. It's also not the answer for couples: sizes stop at UK Small Double.
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 Smooth Tech Ultra 10000 Pocket Mattress
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FAQ's
How firm is the Millbrook Smooth Tech Ultra 10000?
It's described as soft to medium, so it sits on the gentler end of the scale. That makes it a good match for side sleepers and anyone who finds firm mattresses uncomfortable, although stomach sleepers and heavier bodies may want something with more resistance.
Does the Millbrook Smooth Tech Ultra 10000 come with a trial?
Mattress Online lists a 100-night trial with this mattress. That's the retailer's own offer rather than a manufacturer promise, so if you buy elsewhere, check that seller's terms before ordering.
What is the warranty on the Millbrook Smooth Tech Ultra 10000?
The Mattress Online listing states a 10-year guarantee. As with the trial, this appears on the retailer's page, so confirm the guarantee terms with whichever seller you buy from.
What sizes does the Millbrook Smooth Tech Ultra 10000 come in?
It's available in UK Single and UK Small Double. There's no Double, King or Super King option listed at the moment, which rules it out for most couples.
How deep is the Millbrook Smooth Tech Ultra 10000?
It's 35cm deep, which is generous. You may need deep fitted sheets to get a proper fit, so measure your existing bedding before it arrives.
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