Firmness
Medium Soft
Type
Pocket Spring
Depth (cm)
35
Number of Layers
3
Trial Period (nights)
100
Warranty (years)
10
Price Range
£1,075 to £1,529
Best Sleeping Position(s)
Certifications
Assessed from the specification published by Mattress Online, captured September 2026, and from regular price comparison across our UK retail partners.
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. One catch: it's currently only available in UK Single and UK Small Double, so couples wanting a Double or King will need to look elsewhere.
Key Features & what's inside
- 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.
Who's it NOT for?
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.
Millbrook Smooth Tech Ultra 10000 Pocket Mattress
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, priced from £1,075 to £1,529. 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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