Firmness
Medium Firm
Type
Hybrid
Depth (cm)
33
Number of Layers
5
Trial Period (nights)
100
Warranty (years)
10
Price Range
£494 to £610
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 appeal here is natural, breathable materials at a fair price. Hampshire wool and cotton fillings regulate temperature and wick moisture, which means less overheating if you tend to sleep warm. The 3000 pocket springs move independently, so you feel support tailored to your shape rather than a single flat surface, and the NemoFlex™ core adds edge-to-edge support. Sustainability credentials are genuine rather than decorative: a recycled core, a Planet Mark sustainability award and National Bed Federation approval. Mattress Online lists a 10-year warranty and offers a 100-night comfort trial, although that trial requires buying a mattress protector from them, so read the terms before you rely on it.
Key Features & what's inside
- Cover. A soft knitted cotton-viscose cover that enhances airflow, which means heat escapes rather than building up at the surface. It feels gentle from the first night.
- Comfort Layer. Layers of 100% Hampshire wool, naturally durable, springy and heat regulating. Wool keeps you warmer in winter and cooler in summer, a real benefit for hot sleepers.
- Comfort Layer. Natural cotton fibres that regulate body temperature while wicking away moisture. This keeps the sleeping surface feeling fresh rather than clammy.
- Core. A 100% recycled NemoFlex™ core made from recycled polyester using over 200 plastic bottles. It provides edge-to-edge support, so you can use the full width of the mattress.
- Support System. 3000 traditional pocket springs encased in cloth pockets that adapt to your movement. Each spring works independently, which means less disturbance from a restless partner.
Layer details from mattressonline.co.uk product page, September 2026.
Who's it NOT for?
It's only available in UK Single and UK Small Double, so couples needing a Double or King are ruled out straight away. If you prefer a firm, supportive feel, the medium tension may be a little forgiving for you, and some owners have raised concerns about edge support over time.
Millbrook Smooth Tech Luxury 3000 Pocket Mattress
How firm is the Millbrook Smooth Tech Luxury 3000?
Millbrook's product information describes it as medium. That suits most sleepers, although some owner reviews mention the firmness not quite matching the in-store feel, so keep that in mind if you tried it in a showroom.
Does the Millbrook Smooth Tech Luxury 3000 come with a trial?
Mattress Online lists a 100-night comfort trial, but eligibility requires buying a mattress protector from them at the same time. This is the retailer's own offer rather than a Millbrook guarantee, so terms may differ if you buy elsewhere.
Is the Millbrook Smooth Tech Luxury 3000 good for hot sleepers?
It should be. The Hampshire wool and cotton fillings are naturally breathable and heat regulating, and the knitted cotton-viscose cover enhances airflow. Natural fibres like these wick moisture away rather than trapping it, which means a cooler, fresher night than many synthetic-topped mattresses.
What sizes does the Millbrook Smooth Tech Luxury 3000 come in?
Just two: UK Single and UK Small Double. That makes it a solid option for a guest room, a teenager or a solo sleeper, but couples wanting a Double or King will need a different model.
How long is the warranty on the Millbrook Smooth Tech Luxury 3000?
Mattress Online lists a 10-year warranty. As this appears on a retailer listing rather than Millbrook's own site, it's sensible to confirm the warranty terms with whichever retailer you buy from.
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