Firmness
Medium Soft
Type
Pocket Spring
Depth (cm)
30
Number of Layers
4
Trial Period (nights)
100
Warranty (years)
10
Price Range
£1,059 to £1,719
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.
The main appeal here is the layered spring system. The 4000 mini pocket springs sit above 1000 traditional ones, which means you get soothing pressure relief and reduced motion transfer, useful if you share a bed with a restless partner. The comfort layer blends wool, silk, cashgora and cotton, natural fibres that help regulate temperature better than synthetic foams tend to. Edges are reinforced with butterfly springs and a rod frame, so you can sit or sleep near the side without that rolling-off feeling. It conforms to BS7177: 2008, and Millbrook is a National Bed Federation Approved Brand. If you want a traditionally made, natural-filled mattress with a medium feel, this is a strong candidate.
Key Features & what's inside
- Comfort fillings. A blend of wool, silk, cashgora and cotton, which means a breathable, temperature-regulating sleep surface. Natural fibres like these tend to wick moisture better than foam.
- Mini Pocket Springs. 4000 mini pocket springs sit near the surface for added comfort and pressure relief. They also decrease motion transfer, so you feel less of a partner's movement.
- Pocket Springs. 1000 traditional pocket springs, each enclosed in its own cloth pocket. They respond independently to movement, which means support that follows your shape rather than pushing back as one unit.
- Border reinforcement. The edge is reinforced with butterfly springs and secured with a rod frame. That means firmer edge support, useful for sitting on the bed or sleeping close to the side.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
If you prefer a properly firm mattress, the medium feel here may be too giving, particularly for heavier back sleepers. Some owners mention the turning handles are awkward to use, so if regular rotation feels like a chore, a no-turn design might suit you better. Fans of memory foam's slow, hugging feel won't find it here.
Millbrook Smooth Tech Luxury 5000 Pocket Mattress
How firm is the Millbrook Smooth Tech Luxury 5000?
The product page describes it as medium. Some owners report it feels slightly firmer than expected, so if you're a lightweight side sleeper hoping for a soft, sinking feel, try it during a trial period if your retailer offers one.
How many springs does the Millbrook Smooth Tech Luxury 5000 have?
It has 5000 springs in total: 1000 traditional pocket springs for core support, topped with 4000 mini pocket springs that add pressure relief and reduce motion transfer.
Does the Millbrook Smooth Tech Luxury 5000 come with a trial?
Mattress Online lists a 100-night trial with this mattress. That trial is the retailer's own offer rather than a Millbrook guarantee, so if you buy elsewhere, check that retailer's terms before ordering.
What is the warranty on the Millbrook Smooth Tech Luxury 5000?
The retailer listing states a 10 year guarantee. As this appears on a retailer's page rather than Millbrook's own site, confirm the warranty terms with your chosen retailer at the point of purchase.
Does the Millbrook Smooth Tech Luxury 5000 need turning?
It has turning handles, which suggests it is designed to be turned. Some owners mention the handles are a little difficult to use, so bear that in mind if you'd struggle to rotate a 30cm-deep mattress.
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