Millbrook Smooth Tech 4000 Pillow Top King Size Mattress
The Millbrook Smooth Tech 4000 Pillow Top Mattress combines a wool, cotton, silk and cashgora pillow top with micro springs and pocket springs, which means a soft, cushioned surface with support zoned in seven areas.
- Cushioned pillow top feel
- Zoned support in seven areas
- Reinforced edges for sitting & sleeping
£698
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Millbrook Smooth Tech 4000 Pillow Top Mattress
More available sizes
Last seen for £678 at Mattress Online on 5th November 2026
Mattress details
Mattress
Millbrook Smooth Tech 4000 Pillow Top Mattress
Size
Firmness
Medium
Construction
Pocket Spring
Wool
Depth (cm)
32
Layers
3
Layer Details
Pillow top comfort layer
A pillow top filled with a blend of wool, cotton, silk and cashgora. It gives the surface a soft, cushioned feel without relying on foam.
Micro springs
3000 Comfonomic micro springs provide pressure relief and targeted support, so the mattress responds closely to your shape.
Pocket springs
1000 ergonomic pocket springs form the internal support system. They give the mattress its underlying support and stop the soft top from feeling vague.
Layer details from wantmattress.com product page, October 2026.
Key benefits
- More personal space each: At 150cm wide, the UK king gives each of you 75cm, which means 7.5cm more room than a UK double and fewer accidental elbows in the night.
- Length for a taller partner: The 200cm length adds 10cm over the UK double, so a partner approaching 6ft can stretch out properly instead of sleeping with their feet at the very end.
- Edges that hold up: A reinforced edge with a rod frame and butterfly springs should stay steadier when you sleep near the side, so more of the 150cm width is usable.
- A little distance on different schedules: If one of you gets up hours before the other, the wider surface puts slightly more space between you as they climb out in the dark.
- Fits more rooms than a super king: We suggest a room of at least 2.7m x 2.9m, compared with the 3m x 2.9m we'd allow for the UK super king.
- Bedding to match the depth: At 32cm deep, you'll want deep-pocket king fitted sheets, and a 230 x 220cm king duvet covers the top comfortably.
This size suits you if...
You share the bed every night and keep drifting onto each other's side of a UK double, one of you is approaching 6ft and needs the extra 10cm of length, or you go to bed and get up at different times and would like a bit more distance between you.
Consider another size if...
Your room is under our suggested 2.7m x 2.9m, or 75cm each still feels cramped. We'd recommend the UK double for smaller rooms (2.6m x 2.8m) or the UK super king for 90cm each.
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FAQ's
Is a UK king Millbrook Smooth Tech 4000 Pillow Top big enough for two people?
For most couples, yes. The UK king gives you 75cm each, compared with 67.5cm each on a UK double, so you gain 7.5cm of personal space apiece. If you both sprawl or a dog joins you most nights, the UK super king offers 90cm each, although it needs a larger room.
Is the Millbrook Smooth Tech 4000 Pillow Top king size long enough for a tall person?
The UK king is 200cm long (6ft 6in), which is 10cm longer than a UK double. That extra length suits anyone approaching 6ft, who often finds a double leaves their feet at the edge. If length is your main reason for upgrading, the UK super king is the same length, so you only need it for extra width.
What size bedroom do I need for a UK king Millbrook Smooth Tech 4000?
We suggest at least 2.7m x 2.9m, with around 3.2m x 3.2m feeling comfortable. Measure once wardrobes and drawers are in place, because a new build master bedroom can shrink quickly once furniture goes in. Allow space to walk round both sides and open doors fully.
What bedding fits the Millbrook Smooth Tech 4000 Pillow Top in a UK king?
Look for UK king fitted sheets with deep pockets, since this mattress is 32cm deep and standard sheets may not tuck under properly. A 230 x 220cm king duvet fits the 150 x 200cm surface, giving enough overhang for two people to share without tugging.
Should we choose the UK king or UK super king Millbrook Smooth Tech 4000?
The UK super king is 30cm wider but the same length, giving 90cm each rather than 75cm. Choose it if you both move a lot or your room is at least 3m x 2.9m. If your room is tighter, the UK king still gives you noticeably more space than a UK double.